The Experts below are selected from a list of 1125 Experts worldwide ranked by ideXlab platform
Dmytro Lesyk - One of the best experts on this subject based on the ideXlab platform.
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influence of combined Laser Heat Treatment and ultrasonic impact Treatment on microstructure and corrosion behavior of aisi 1045 steel
Surface & Coatings Technology, 2020Co-Authors: Dmytro Lesyk, Vitaliy Dzhemelinskyi, S. Martínez, N Mordyuk, M O Iefimov, А. LamikizAbstract:Abstract This work aimed to study the influence of a Laser Heat Treatment (LHT), ultrasonic impact Treatment (UIT), and their combinations on the corrosion behavior of AISI 1045 carbon steel in saline solution. Microstructural features and phase state formed in the near-surface layers by LHT-induced transformations and UIT-induced plastic deformation were observed by optical microscopy, X-ray diffraction analysis, and transmission electron microscopy . The surface roughness, hardening intensity, and residual stresses were also analyzed. The results of the polarization experiments showed an essential increase of corrosion potential, corrosion current attenuation and increase in the protection efficiency of the passive film indicating a slowdown of the corrosion rate of the of 1045 steel specimens by the LHT and combined (UIT + LHT, LHT + UIT) techniques, while the single UIT process was less effective. In addition to the LHT-formed oxide layer, the following microstructural factors affect the enhanced corrosion resistance of 1045 steel: the lowered surface roughness, compressive residual stresses, the martensite formation instead of ferritic/pearlitic structure, an increase in the carbon content in the iron lattice due to cementite dissolution, refinement of the martensitic grains. The combined LHT + UIT process is concluded to be the most effective method providing the anti-corrosion performance of 1045 steel.
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effects of Laser Heat Treatment combined with ultrasonic impact Treatment on the surface topography and hardness of carbon steel aisi 1045
Optics and Laser Technology, 2019Co-Authors: Dmytro Lesyk, B.n. Mordyuk, Vitaliy Dzhemelinskyi, S. Martínez, A Lamikiz, Georguiy Ivanovych ProkopenkoAbstract:Abstract The surface layers of medium-carbon steel AISI 1045 were hardened by Laser Heat Treatment (LHT) and by ultrasonic impact Treatment (UIT) applied separately and in different sequences. The advantages of the two latter combined Laser-ultrasonic hardening and finishing methods (the LHT + UIT and UIT + LHT combined Treatments) are also analyzed in this work. The Laser transformation hardening process was implemented using a 1 kW solid-state fiber Laser with scanning optics and a proportional integral derivative (PID) closed-loop temperature control. The ultrasonic strain hardening process was carried out by means of a 0.3 kW ultrasonic generator and an ultrasonic oscillatory system, which contained a piezoceramic transducer, step-like horn and the impact head with seven cylindrical pins. The single-path processes were studied. The separately applied LHT and UIT process were firstly analyzed using a response surface method (RSM) and the analysis of variance (ANOVA). The effects of the Heating temperature (1050–1300 °C) and the specimen feed rate (40–140 mm/min) used at the LHT process on the features of the hardened zone and surface hardness/microhardness of subsurface layer were assessed. The effects of the vibration amplitude of ultrasonic horn (15–18 μm) and Treatment duration (60–240 s) at UIT on the surface roughness/waviness and hardness were also investigated. The experimental plan is based on a miscellaneous design matrix method. The quadratic regression equations for predicting the studied output parameters were developed and the optimum regimes of the LHT and UIT processes were determined based on the highest surface hardness and minimum roughness/waviness. Then, the influences of the combined Treatments on the surface topography and hardness were analyzed and compared to those of single LHT and single UIT processes. Results show that the combined Treatments provide more than triple increase in the surface hardness in comparison with that of the initial state, as well as formation a regular microrelief with minimum surface roughness.
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Microstructure related enhancement in wear resistance of tool steel AISI D2 by applying Laser Heat Treatment followed by ultrasonic impact Treatment
Surface & Coatings Technology, 2017Co-Authors: Dmytro Lesyk, B.n. Mordyuk, Vitaliy Dzhemelinskyi, А. Lamikiz, Georguiy Ivanovych Prokopenko, Yu.v. Milman, S. Martínez, K.e. GrinkevychAbstract:Abstract The surface layers of tool steel AISI D2 were modified by Laser Heat Treatment (LHT) conducted using the solid state fiber-Laser, by ultrasonic impact Treatment (UIT) and by the combined LHT + UIT process. The paper is focused on the establishing the correlation between the microstructure, hardness and wear resistance of the modified layers. XRD analysis and TEM observations show that the LHT process results in the formation of microstructure comprised submicronic ferrite/austenite grains, martensitic needles and secondary carbides while the combined LHT + UIT process leads to the formation ultra-fine grained structure (~ 80–250 nm) with grain boundaries fixed with fine secondary carbides (~ 20 nm), and some areas of martensitic feathers. The observed microstructural features and phase compositions are shown to affect the wear resistance of the AISI D2 steel surface measured both in quasi-static and dynamic conditions. The modified layers demonstrate almost double, triple and four times decrease in the wear losses in dynamic conditions with regard to the initial surface after the LHT, UIT, and combined LHT + UIT processes, respectively. Theoretical evaluations of the wear resistance W− 1th using the Archard expression correlate well with the experimental data W− 1exp, especially when the local plasticity characteristics δН describing the retained plasticity was taken into account.
А. Lamikiz - One of the best experts on this subject based on the ideXlab platform.
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influence of combined Laser Heat Treatment and ultrasonic impact Treatment on microstructure and corrosion behavior of aisi 1045 steel
Surface & Coatings Technology, 2020Co-Authors: Dmytro Lesyk, Vitaliy Dzhemelinskyi, S. Martínez, N Mordyuk, M O Iefimov, А. LamikizAbstract:Abstract This work aimed to study the influence of a Laser Heat Treatment (LHT), ultrasonic impact Treatment (UIT), and their combinations on the corrosion behavior of AISI 1045 carbon steel in saline solution. Microstructural features and phase state formed in the near-surface layers by LHT-induced transformations and UIT-induced plastic deformation were observed by optical microscopy, X-ray diffraction analysis, and transmission electron microscopy . The surface roughness, hardening intensity, and residual stresses were also analyzed. The results of the polarization experiments showed an essential increase of corrosion potential, corrosion current attenuation and increase in the protection efficiency of the passive film indicating a slowdown of the corrosion rate of the of 1045 steel specimens by the LHT and combined (UIT + LHT, LHT + UIT) techniques, while the single UIT process was less effective. In addition to the LHT-formed oxide layer, the following microstructural factors affect the enhanced corrosion resistance of 1045 steel: the lowered surface roughness, compressive residual stresses, the martensite formation instead of ferritic/pearlitic structure, an increase in the carbon content in the iron lattice due to cementite dissolution, refinement of the martensitic grains. The combined LHT + UIT process is concluded to be the most effective method providing the anti-corrosion performance of 1045 steel.
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Microstructure related enhancement in wear resistance of tool steel AISI D2 by applying Laser Heat Treatment followed by ultrasonic impact Treatment
Surface & Coatings Technology, 2017Co-Authors: Dmytro Lesyk, B.n. Mordyuk, Vitaliy Dzhemelinskyi, А. Lamikiz, Georguiy Ivanovych Prokopenko, Yu.v. Milman, S. Martínez, K.e. GrinkevychAbstract:Abstract The surface layers of tool steel AISI D2 were modified by Laser Heat Treatment (LHT) conducted using the solid state fiber-Laser, by ultrasonic impact Treatment (UIT) and by the combined LHT + UIT process. The paper is focused on the establishing the correlation between the microstructure, hardness and wear resistance of the modified layers. XRD analysis and TEM observations show that the LHT process results in the formation of microstructure comprised submicronic ferrite/austenite grains, martensitic needles and secondary carbides while the combined LHT + UIT process leads to the formation ultra-fine grained structure (~ 80–250 nm) with grain boundaries fixed with fine secondary carbides (~ 20 nm), and some areas of martensitic feathers. The observed microstructural features and phase compositions are shown to affect the wear resistance of the AISI D2 steel surface measured both in quasi-static and dynamic conditions. The modified layers demonstrate almost double, triple and four times decrease in the wear losses in dynamic conditions with regard to the initial surface after the LHT, UIT, and combined LHT + UIT processes, respectively. Theoretical evaluations of the wear resistance W− 1th using the Archard expression correlate well with the experimental data W− 1exp, especially when the local plasticity characteristics δН describing the retained plasticity was taken into account.
Vitaliy Dzhemelinskyi - One of the best experts on this subject based on the ideXlab platform.
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influence of combined Laser Heat Treatment and ultrasonic impact Treatment on microstructure and corrosion behavior of aisi 1045 steel
Surface & Coatings Technology, 2020Co-Authors: Dmytro Lesyk, Vitaliy Dzhemelinskyi, S. Martínez, N Mordyuk, M O Iefimov, А. LamikizAbstract:Abstract This work aimed to study the influence of a Laser Heat Treatment (LHT), ultrasonic impact Treatment (UIT), and their combinations on the corrosion behavior of AISI 1045 carbon steel in saline solution. Microstructural features and phase state formed in the near-surface layers by LHT-induced transformations and UIT-induced plastic deformation were observed by optical microscopy, X-ray diffraction analysis, and transmission electron microscopy . The surface roughness, hardening intensity, and residual stresses were also analyzed. The results of the polarization experiments showed an essential increase of corrosion potential, corrosion current attenuation and increase in the protection efficiency of the passive film indicating a slowdown of the corrosion rate of the of 1045 steel specimens by the LHT and combined (UIT + LHT, LHT + UIT) techniques, while the single UIT process was less effective. In addition to the LHT-formed oxide layer, the following microstructural factors affect the enhanced corrosion resistance of 1045 steel: the lowered surface roughness, compressive residual stresses, the martensite formation instead of ferritic/pearlitic structure, an increase in the carbon content in the iron lattice due to cementite dissolution, refinement of the martensitic grains. The combined LHT + UIT process is concluded to be the most effective method providing the anti-corrosion performance of 1045 steel.
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effects of Laser Heat Treatment combined with ultrasonic impact Treatment on the surface topography and hardness of carbon steel aisi 1045
Optics and Laser Technology, 2019Co-Authors: Dmytro Lesyk, B.n. Mordyuk, Vitaliy Dzhemelinskyi, S. Martínez, A Lamikiz, Georguiy Ivanovych ProkopenkoAbstract:Abstract The surface layers of medium-carbon steel AISI 1045 were hardened by Laser Heat Treatment (LHT) and by ultrasonic impact Treatment (UIT) applied separately and in different sequences. The advantages of the two latter combined Laser-ultrasonic hardening and finishing methods (the LHT + UIT and UIT + LHT combined Treatments) are also analyzed in this work. The Laser transformation hardening process was implemented using a 1 kW solid-state fiber Laser with scanning optics and a proportional integral derivative (PID) closed-loop temperature control. The ultrasonic strain hardening process was carried out by means of a 0.3 kW ultrasonic generator and an ultrasonic oscillatory system, which contained a piezoceramic transducer, step-like horn and the impact head with seven cylindrical pins. The single-path processes were studied. The separately applied LHT and UIT process were firstly analyzed using a response surface method (RSM) and the analysis of variance (ANOVA). The effects of the Heating temperature (1050–1300 °C) and the specimen feed rate (40–140 mm/min) used at the LHT process on the features of the hardened zone and surface hardness/microhardness of subsurface layer were assessed. The effects of the vibration amplitude of ultrasonic horn (15–18 μm) and Treatment duration (60–240 s) at UIT on the surface roughness/waviness and hardness were also investigated. The experimental plan is based on a miscellaneous design matrix method. The quadratic regression equations for predicting the studied output parameters were developed and the optimum regimes of the LHT and UIT processes were determined based on the highest surface hardness and minimum roughness/waviness. Then, the influences of the combined Treatments on the surface topography and hardness were analyzed and compared to those of single LHT and single UIT processes. Results show that the combined Treatments provide more than triple increase in the surface hardness in comparison with that of the initial state, as well as formation a regular microrelief with minimum surface roughness.
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Microstructure related enhancement in wear resistance of tool steel AISI D2 by applying Laser Heat Treatment followed by ultrasonic impact Treatment
Surface & Coatings Technology, 2017Co-Authors: Dmytro Lesyk, B.n. Mordyuk, Vitaliy Dzhemelinskyi, А. Lamikiz, Georguiy Ivanovych Prokopenko, Yu.v. Milman, S. Martínez, K.e. GrinkevychAbstract:Abstract The surface layers of tool steel AISI D2 were modified by Laser Heat Treatment (LHT) conducted using the solid state fiber-Laser, by ultrasonic impact Treatment (UIT) and by the combined LHT + UIT process. The paper is focused on the establishing the correlation between the microstructure, hardness and wear resistance of the modified layers. XRD analysis and TEM observations show that the LHT process results in the formation of microstructure comprised submicronic ferrite/austenite grains, martensitic needles and secondary carbides while the combined LHT + UIT process leads to the formation ultra-fine grained structure (~ 80–250 nm) with grain boundaries fixed with fine secondary carbides (~ 20 nm), and some areas of martensitic feathers. The observed microstructural features and phase compositions are shown to affect the wear resistance of the AISI D2 steel surface measured both in quasi-static and dynamic conditions. The modified layers demonstrate almost double, triple and four times decrease in the wear losses in dynamic conditions with regard to the initial surface after the LHT, UIT, and combined LHT + UIT processes, respectively. Theoretical evaluations of the wear resistance W− 1th using the Archard expression correlate well with the experimental data W− 1exp, especially when the local plasticity characteristics δН describing the retained plasticity was taken into account.
S. Martínez - One of the best experts on this subject based on the ideXlab platform.
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influence of combined Laser Heat Treatment and ultrasonic impact Treatment on microstructure and corrosion behavior of aisi 1045 steel
Surface & Coatings Technology, 2020Co-Authors: Dmytro Lesyk, Vitaliy Dzhemelinskyi, S. Martínez, N Mordyuk, M O Iefimov, А. LamikizAbstract:Abstract This work aimed to study the influence of a Laser Heat Treatment (LHT), ultrasonic impact Treatment (UIT), and their combinations on the corrosion behavior of AISI 1045 carbon steel in saline solution. Microstructural features and phase state formed in the near-surface layers by LHT-induced transformations and UIT-induced plastic deformation were observed by optical microscopy, X-ray diffraction analysis, and transmission electron microscopy . The surface roughness, hardening intensity, and residual stresses were also analyzed. The results of the polarization experiments showed an essential increase of corrosion potential, corrosion current attenuation and increase in the protection efficiency of the passive film indicating a slowdown of the corrosion rate of the of 1045 steel specimens by the LHT and combined (UIT + LHT, LHT + UIT) techniques, while the single UIT process was less effective. In addition to the LHT-formed oxide layer, the following microstructural factors affect the enhanced corrosion resistance of 1045 steel: the lowered surface roughness, compressive residual stresses, the martensite formation instead of ferritic/pearlitic structure, an increase in the carbon content in the iron lattice due to cementite dissolution, refinement of the martensitic grains. The combined LHT + UIT process is concluded to be the most effective method providing the anti-corrosion performance of 1045 steel.
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effects of Laser Heat Treatment combined with ultrasonic impact Treatment on the surface topography and hardness of carbon steel aisi 1045
Optics and Laser Technology, 2019Co-Authors: Dmytro Lesyk, B.n. Mordyuk, Vitaliy Dzhemelinskyi, S. Martínez, A Lamikiz, Georguiy Ivanovych ProkopenkoAbstract:Abstract The surface layers of medium-carbon steel AISI 1045 were hardened by Laser Heat Treatment (LHT) and by ultrasonic impact Treatment (UIT) applied separately and in different sequences. The advantages of the two latter combined Laser-ultrasonic hardening and finishing methods (the LHT + UIT and UIT + LHT combined Treatments) are also analyzed in this work. The Laser transformation hardening process was implemented using a 1 kW solid-state fiber Laser with scanning optics and a proportional integral derivative (PID) closed-loop temperature control. The ultrasonic strain hardening process was carried out by means of a 0.3 kW ultrasonic generator and an ultrasonic oscillatory system, which contained a piezoceramic transducer, step-like horn and the impact head with seven cylindrical pins. The single-path processes were studied. The separately applied LHT and UIT process were firstly analyzed using a response surface method (RSM) and the analysis of variance (ANOVA). The effects of the Heating temperature (1050–1300 °C) and the specimen feed rate (40–140 mm/min) used at the LHT process on the features of the hardened zone and surface hardness/microhardness of subsurface layer were assessed. The effects of the vibration amplitude of ultrasonic horn (15–18 μm) and Treatment duration (60–240 s) at UIT on the surface roughness/waviness and hardness were also investigated. The experimental plan is based on a miscellaneous design matrix method. The quadratic regression equations for predicting the studied output parameters were developed and the optimum regimes of the LHT and UIT processes were determined based on the highest surface hardness and minimum roughness/waviness. Then, the influences of the combined Treatments on the surface topography and hardness were analyzed and compared to those of single LHT and single UIT processes. Results show that the combined Treatments provide more than triple increase in the surface hardness in comparison with that of the initial state, as well as formation a regular microrelief with minimum surface roughness.
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Microstructure related enhancement in wear resistance of tool steel AISI D2 by applying Laser Heat Treatment followed by ultrasonic impact Treatment
Surface & Coatings Technology, 2017Co-Authors: Dmytro Lesyk, B.n. Mordyuk, Vitaliy Dzhemelinskyi, А. Lamikiz, Georguiy Ivanovych Prokopenko, Yu.v. Milman, S. Martínez, K.e. GrinkevychAbstract:Abstract The surface layers of tool steel AISI D2 were modified by Laser Heat Treatment (LHT) conducted using the solid state fiber-Laser, by ultrasonic impact Treatment (UIT) and by the combined LHT + UIT process. The paper is focused on the establishing the correlation between the microstructure, hardness and wear resistance of the modified layers. XRD analysis and TEM observations show that the LHT process results in the formation of microstructure comprised submicronic ferrite/austenite grains, martensitic needles and secondary carbides while the combined LHT + UIT process leads to the formation ultra-fine grained structure (~ 80–250 nm) with grain boundaries fixed with fine secondary carbides (~ 20 nm), and some areas of martensitic feathers. The observed microstructural features and phase compositions are shown to affect the wear resistance of the AISI D2 steel surface measured both in quasi-static and dynamic conditions. The modified layers demonstrate almost double, triple and four times decrease in the wear losses in dynamic conditions with regard to the initial surface after the LHT, UIT, and combined LHT + UIT processes, respectively. Theoretical evaluations of the wear resistance W− 1th using the Archard expression correlate well with the experimental data W− 1exp, especially when the local plasticity characteristics δН describing the retained plasticity was taken into account.
Rikard Söderberg - One of the best experts on this subject based on the ideXlab platform.
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Effect of selective Laser Heat Treatment on geometrical variation in boron steel components: An experimental investigation
Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, 2020Co-Authors: Vaishak Ramesh Sagar, Kristina Wärmefjord, Rikard SöderbergAbstract:Selective Laser Heat Treatment is a well-known process for its ability to produce tailor Heat treated blanks (THTB). Specifically, ultra high strength boron steels with tailored material properties can be produced. However, this process generates unwanted distortion and influences geometrical variation. This in turn can affect functionality, aesthetics, and performance of the final product. Understanding the effects on geometrical variation in the final product or the assembly will enable in designing and producing geometry assured products. In this paper, boron steel blanks were selectively Laser Heat treated with a specific Heat Treatment pattern and Laser Heating direction sequence. These Heat treated blanks were then cold formed. Further on, spot welding simulation of the cold formed parts was performed to assess the effect on geometrical variation at the assembly level. The results show that the effect of selective Laser Heat Treatment on geometrical variation at part level propagates further to the assembly level. It implies that the effect on geometrical variation should be minimized at part level, when the blanks are Laser Heat treated. Hence, the sources that influence geometrical variation at part level when employing selective Laser Heat Treatment are presented and discussed. The motivation and possibilities to minimize the effects in the early design concept stages is provided.
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Influence of Selective Laser Heat Treatment Pattern Position on Geometrical Variation
Journal of Manufacturing Science and Engineering, 2019Co-Authors: Vaishak Ramesh Sagar, Kristina Wärmefjord, Rikard SöderbergAbstract:Selective Laser Heat Treatment allows local modification of material properties and can have a wide range of applications within the automotive industry. Enhanced formability and strength are possible to achieve. As the process involves selective Heating, positioning of the Heat Treatment pattern in local areas is vital. Pattern positioning is often suggested based on the part design and forming aspects of the material to avoid failures during manufacturing. Along with improving material properties in desired local areas, the process also produces unwanted distortion in the material. Such effects on variation should be considered and minimized. In this paper, the Heat Treatment pattern is offset from its original position and its effect on geometrical variation is investigated. Boron steel blanks are selectively Laser Heat treated with a specific Heat Treatment pattern and then cold formed to the desired shape. Two Heat Treatment pattern dimensions are examined. Geometrical variation at the blank level and after cold forming, and springback after cold forming are observed. Results show that pattern offsetting increases the effect on geometrical variation. Therefore, correct positioning of the Heat Treatment pattern is important to minimize its effect on geometrical variation along with enhancement in the material properties. Knowledge from this study will contribute to various stages of the geometry assurance process
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Influence of Selective Laser Heat Treatment Pattern Position on Geometrical Variation
Volume 2: Advanced Manufacturing, 2018Co-Authors: Vaishak Ramesh Sagar, Kristina Wärmefjord, Rikard SöderbergAbstract:Selective Laser Heat Treatment allows local modification of material properties and can have wide range of applications within the automotive industry. Enhanced formability and strength are possible to achieve. As the process involves selective Heating, positioning of the Heat Treatment pattern in local areas is vital. Pattern positioning is often suggested based on the part design and forming aspects of the material to avoid failures during manufacturing. Along with improving material properties in desired local areas, the process also produces unwanted distortion in the material. Such effects on variation should be considered and minimized. In this paper, Heat Treatment pattern is offset from its original position and its effect on geometrical variation is investigated. Boron steel blanks are selectively Laser Heat treated with a specific Heat Treatment pattern and then stamped to desired shape. Two Heat Treatment pattern dimensions are examined. Variation at blank level and after stamping, and springback after stamping is observed. Results show that pattern offsetting leads to higher geometrical variation. Therefore, correct positioning of Heat Treatment pattern is important to minimize its effect on geometrical variation along with enhancing the material properties. Knowledge from this study will contribute to various stages of the geometrical assurance process.
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Geometrical Variation from Selective Laser Heat Treatment of Boron Steels
Procedia CIRP, 2018Co-Authors: Vaishak Ramesh Sagar, Kristina Wärmefjord, Rikard SöderbergAbstract:Selective Laser Heat Treatment is used to enhance material properties in high strength steels and finds wide range of applications in the automotive industry. However, the manufactured components also become sensitive to variation affecting functionality, esthetics, and performance of the final product. In this paper, selective Laser Heat Treatment of boron steels is analyzed with emphasis on geometrical variation. Different manufacturing strategies are tested by varying Heating direction sequence and Heat Treatment pattern and their influence on springback is investigated. The results indicate their significant contribution to geometrical variation and the need to consider them in various stages of the geometry assurance process.
