The Experts below are selected from a list of 70128 Experts worldwide ranked by ideXlab platform
Erhard Brandl - One of the best experts on this subject based on the ideXlab platform.
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additive manufactured alsi10mg samples using selective laser melting slm microstructure high cycle fatigue and fracture behavior
Materials & Design, 2012Co-Authors: Erhard Brandl, Ulrike Heckenberger, Vitus Holzinger, Damien BuchbinderAbstract:Abstract In order to produce serial parts via additive layer manufacturing, the fatigue performance can be a critical attribute. In this paper, the microstructure, high cycle fatigue (HCF), and fracture behavior of additive manufactured AlSi10Mg samples are investigated. The samples were manufactured by a particular powder-bed process called Selective Laser Melting (SLM) and machined afterwards. 91 samples were manufactured without (30 °C) and with heating (300 °C) of the Building platform and in different Directions (0°, 45°, 90°). Samples were tested in the peak-hardened (T6) and as-built condition. The Wohler curves were interpolated by a Weibull distribution. The results were analysed statistically by design of experiments, correlation analysis, and marginal means plots. The investigations show that the post heat treatment has the most considerable effect and the Building Direction has the least considerable effect on the fatigue resistance. The fatigue resistance of the samples, however, is high in comparison to the standard DIN EN 1706. The combination of 300 °C platform heating and peak-hardening is a valuable approach to increase the fatigue resistance and neutralize the differences in fatigue life for the 0°, 45°, and 90° Directions.
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additive manufactured alsi10mg samples using selective laser melting slm microstructure high cycle fatigue and fracture behavior
Materials & Design, 2012Co-Authors: Erhard Brandl, Ulrike Heckenberger, Vitus Holzinger, Damien BuchbinderAbstract:Abstract In order to produce serial parts via additive layer manufacturing, the fatigue performance can be a critical attribute. In this paper, the microstructure, high cycle fatigue (HCF), and fracture behavior of additive manufactured AlSi10Mg samples are investigated. The samples were manufactured by a particular powder-bed process called Selective Laser Melting (SLM) and machined afterwards. 91 samples were manufactured without (30 °C) and with heating (300 °C) of the Building platform and in different Directions (0°, 45°, 90°). Samples were tested in the peak-hardened (T6) and as-built condition. The Wohler curves were interpolated by a Weibull distribution. The results were analysed statistically by design of experiments, correlation analysis, and marginal means plots. The investigations show that the post heat treatment has the most considerable effect and the Building Direction has the least considerable effect on the fatigue resistance. The fatigue resistance of the samples, however, is high in comparison to the standard DIN EN 1706. The combination of 300 °C platform heating and peak-hardening is a valuable approach to increase the fatigue resistance and neutralize the differences in fatigue life for the 0°, 45°, and 90° Directions.
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mechanical properties of additive manufactured titanium ti 6al 4v blocks deposited by a solid state laser and wire
Materials & Design, 2011Co-Authors: Erhard Brandl, Frank Palm, Vesselin Michailov, Bernd Viehweger, Christoph LeyensAbstract:Abstract In this paper, the mechanical properties and chemical composition of additive manufactured Ti–6Al–4V blocks are investigated and compared to plate material and aerospace specifications. Blocks (seven beads wide, seven layers high, 165 mm long) were deposited using a 3.5 kW Nd:YAG laser and Ti–6Al–4V wire. Two different sets of process parameters are used and three different conditions (as-built, 600 °C/4 h, 1200 °C/2 h) of the deposit are investigated. The particular impurity levels of the blocks are considerably below those tolerated according to aerospace material specifications (AMS 4911L). Static tensile samples are extracted from the blocks in the deposition Direction and punch samples are extracted in the Building Direction. The experiments show that as-deposited Ti–6Al–4V can achieve strength and ductility properties that fulfill aerospace specifications of the wrought Ti–6Al–4V material (AMS 4928). The 600 °C/4 h heat treatment leads to a significantly higher strength in the deposition Direction, but can also decrease ductility. The 1200 °C/2 h treatment tends to decrease the alloy’s strength.
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wire based additive layer manufacturing comparison of microstructure and mechanical properties of ti 6al 4v components fabricated by laser beam deposition and shaped metal deposition
Journal of Materials Processing Technology, 2011Co-Authors: Bernd Baufeld, Erhard Brandl, Omer Van Der BiestAbstract:Abstract The microstructure and the mechanical properties of Ti–6Al–4V components, fabricated by two different wire based additive layer manufacturing techniques, namely laser-beam deposition and shaped metal deposition, are presented. Both techniques resulted in dense components with lamellar α / β microstructure. Large ultimate tensile strength values between 900 and 1000 MPa were observed. The strain at failure strongly depends on the orientation, where highest values up to 19% were obtained in Direction of the Building Direction. Heat treatment increased the highest strain at failure up to 22%. The fatigue limit was observed to be higher than 770 MPa.
Hao Wang - One of the best experts on this subject based on the ideXlab platform.
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influence of scanning strategy and Building Direction on microstructure and corrosion behaviour of selective laser melted 316l stainless steel
Materials & Design, 2021Co-Authors: Cuiling Zhao, Yuchao Bai, Yu Zhang, Xiaopeng Wang, Junmin Xue, Hao WangAbstract:Abstract In-depth understanding of corrosion behaviour is a key aspect regarding the application of additively manufactured parts. In this study, 316L stainless steel was manufactured under different scanning strategies using selective laser melting (SLM). Microstructure characterization and electrochemical tests in NaCl aqueous solution (3.5 wt%), including open circuit potential (OCP), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS), were conducted to study the influence of scanning strategies on the corrosion behaviour. The microstructure and corrosion on different planes were characterized to reveal the influence of Building Direction. EBSD analysis shows that the scanning strategy affects the continuity of grain growth through adjacent layers and the growth of grains inside the melt track. Electrochemical tests indicate a clear difference in corrosion resistance perpendicular and parallel to Building Direction and with different scanning strategies. Pitting corrosion is the main form of corrosion in SLM 316L stainless steel and preferentially initiates on molten pool boundaries.
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densification behavior and influence of Building Direction on high anisotropy in selective laser melting of high strength 18ni co mo ti maraging steel
Elements, 2021Co-Authors: Yuchao Bai, Yan Jin Lee, Hao WangAbstract:The mechanical properties, physical properties and electrochemical behavior of metal components produced by selective laser melting can be influenced by the relative density and Building Direction. To this end, the optimization of the Building process was conducted by identifying the influence of process parameters on the relative density and determining the ideal combination of parameters using the Box–Behnken design response surface methodology to achieve a relative density of 99.303 pct. With the ideal process parameters, material strength, thermal, and electrochemical performance were evaluated in a series of experiments. Anisotropic characteristics were displayed due to the differences in build-Direction, microstructural features, and phase composition. The 0 deg possessed the highest tensile strength measured to be 1263.03 ± 8.71 MPa, while the 45 deg demonstrated the highest ductility with an elongation of 13.21 ± 0.34 pct. Thermal expansion was governed by the heat treatment process, such that anisotropic traits were eliminated after solution treatment. Strip melt tracks on the X–Y plane differed from the strip and arcuate melt tracks observed in the X–Z and Y–Z planes, leading to significant deficiencies in electrochemical reactance with an open circuit potential of − 645.8 mV in comparison to the latter measured at − 397.7 and − 396.7 mV, respectively.
Xiaoyan Zeng - One of the best experts on this subject based on the ideXlab platform.
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layer thickness dependence of performance in high power selective laser melting of 1cr18ni9ti stainless steel
Journal of Materials Processing Technology, 2015Co-Authors: Zemin Wang, Xiaoyan ZengAbstract:Abstract High-power selective laser melting (HP SLM) technology has been used to build 1Cr18Ni9Ti stainless steel samples with 60–150 μm thick powder layers. The relative density, metallurgical bonding mechanisms, microstructure and mechanical properties of the samples are presented. It is found that full density cannot be obtained at thicker powder layers due to the residual micropores. With increasing layer thickness from 60 μm to 150 μm, the primary dendrite spacing first increases from about 0.5 μm to 1.5 μm and then stabilizes around 2.0 μm. The microhardness of the fabricated samples by HP SLM shows Directional dependent due to the anisotropy of microstructure and grain coarsening in the bonding area. Tensile strengths of the HP SLMed 1Cr18Ni9Ti samples are much higher than those of wrought 1Cr18Ni9Ti regardless of layer thickness and Building Direction. Importantly, the powder layer thickness cannot be increased without limit to ensure the comprehensive performance of the HP SLMed samples.
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effects of processing parameters on tensile properties of selective laser melted 304 stainless steel
Materials & Design, 2013Co-Authors: Kai Guan, Zemin Wang, Ming Gao, Xiaoyan ZengAbstract:Abstract Selective laser melting (SLM) technology based on powder bed has been used to manufacture 304 stainless steel samples. The effects of slice thickness, overlap rate, Building Direction and hatch angle on tensile properties of SLMed 304 stainless steel samples are investigated. It is found that tensile properties of SLMed 304 stainless steel are independent of slice thickness and overlap rate, but increase slowly with increasing interval number of deposited layers. The hatch angle of 105° with the maximum interval number of deposited layers and vertical Building Direction are preferred to get excellent tensile properties. Importantly, all the SLMed samples feature much higher σ 0.2 /UTS values of nearly 0.8. The tensile strengths and ductility of SLMed samples at proper parameters are higher than those of the wrought 304 stainless steel.
Damien Buchbinder - One of the best experts on this subject based on the ideXlab platform.
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additive manufactured alsi10mg samples using selective laser melting slm microstructure high cycle fatigue and fracture behavior
Materials & Design, 2012Co-Authors: Erhard Brandl, Ulrike Heckenberger, Vitus Holzinger, Damien BuchbinderAbstract:Abstract In order to produce serial parts via additive layer manufacturing, the fatigue performance can be a critical attribute. In this paper, the microstructure, high cycle fatigue (HCF), and fracture behavior of additive manufactured AlSi10Mg samples are investigated. The samples were manufactured by a particular powder-bed process called Selective Laser Melting (SLM) and machined afterwards. 91 samples were manufactured without (30 °C) and with heating (300 °C) of the Building platform and in different Directions (0°, 45°, 90°). Samples were tested in the peak-hardened (T6) and as-built condition. The Wohler curves were interpolated by a Weibull distribution. The results were analysed statistically by design of experiments, correlation analysis, and marginal means plots. The investigations show that the post heat treatment has the most considerable effect and the Building Direction has the least considerable effect on the fatigue resistance. The fatigue resistance of the samples, however, is high in comparison to the standard DIN EN 1706. The combination of 300 °C platform heating and peak-hardening is a valuable approach to increase the fatigue resistance and neutralize the differences in fatigue life for the 0°, 45°, and 90° Directions.
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additive manufactured alsi10mg samples using selective laser melting slm microstructure high cycle fatigue and fracture behavior
Materials & Design, 2012Co-Authors: Erhard Brandl, Ulrike Heckenberger, Vitus Holzinger, Damien BuchbinderAbstract:Abstract In order to produce serial parts via additive layer manufacturing, the fatigue performance can be a critical attribute. In this paper, the microstructure, high cycle fatigue (HCF), and fracture behavior of additive manufactured AlSi10Mg samples are investigated. The samples were manufactured by a particular powder-bed process called Selective Laser Melting (SLM) and machined afterwards. 91 samples were manufactured without (30 °C) and with heating (300 °C) of the Building platform and in different Directions (0°, 45°, 90°). Samples were tested in the peak-hardened (T6) and as-built condition. The Wohler curves were interpolated by a Weibull distribution. The results were analysed statistically by design of experiments, correlation analysis, and marginal means plots. The investigations show that the post heat treatment has the most considerable effect and the Building Direction has the least considerable effect on the fatigue resistance. The fatigue resistance of the samples, however, is high in comparison to the standard DIN EN 1706. The combination of 300 °C platform heating and peak-hardening is a valuable approach to increase the fatigue resistance and neutralize the differences in fatigue life for the 0°, 45°, and 90° Directions.
Maria L Monterosistiaga - One of the best experts on this subject based on the ideXlab platform.
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microstructure and mechanical properties of hastelloy x produced by hp slm high power selective laser melting
Materials & Design, 2019Co-Authors: Jan Van Humbeeck, Maria L Monterosistiaga, Saeid Pourbabak, Dominique Schryvers, Kim VanmeenselAbstract:Abstract In order to increase the production rate during selective laser melting (SLM), a high power laser with a large beam diameter is used to build fully dense Hastelloy X parts. Compared to SLM with a low power and small diameter beam, the productivity was increased from 6 mm3/s to 16 mm3/s, i.e. 2.6 times faster. Besides the productivity benefit, the influence of the use of a high power laser on the rapid solidification microstructure and concomitant material properties is highlighted. The current paper compares the microstructure and tensile properties of Hastelloy X built with low and high power lasers. The use of a high power laser results in wider and shallower melt pools inducing an enhanced morphological and crystallographic texture along the Building Direction (BD). In addition, the increased heat input results in coarser sub-grains or high density dislocation walls for samples processed with a high power laser. Additionally, the influence of hot isostatic pressing (HIP) as a post-processing technique was evaluated. After HIP, the tensile fracture strain increased as compared to the strain in the as-built state and helped in obtaining competitive mechanical properties as compared to conventionally processed Hastelloy X parts.
