The Experts below are selected from a list of 135 Experts worldwide ranked by ideXlab platform
S Tekeli - One of the best experts on this subject based on the ideXlab platform.
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the effect of martensite volume fraction and particle size on the tensile properties of a surface carburized aisi 8620 steel with a dual phase Core Microstructure
Materials Characterization, 2002Co-Authors: Mehmet Erdogan, S TekeliAbstract:This study is focused on the production of a dual-phase steel structure in the Core of a surface-carburized AISI 8620 cementation steel and the effect of martensite volume fraction (MVF) and martensite particle size (MPS) on tensile properties. Experimental results showed that, compared with specimens with a fully martensitic Microstructure in the Core, those with a dual-phase Microstructure in the Core exhibited slightly lower tensile and yield strength but superior ductility without sacrificing surface hardness. In specimens with a dual-phase Microstructure in the Core, the tensile strength increased and ductility decreased with increasing MVF. Both the tensile strength and the ductility increased with decreasing MPS at constant MVF. The best combination of tensile strength and ductility was obtained with a fine MPS at a constant MVF of 25%.
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the effect of martensite particle size on tensile fracture of surface carburised aisi 8620 steel with dual phase Core Microstructure
Materials & Design, 2002Co-Authors: Mehmet Erdogan, S TekeliAbstract:In this study, the production of dual phase Microstructure in the Core of surface-carburised AISI 8620 cementation steel and the effect of martensite particle size at constant martensite volume fraction on tensile fracture have been investigated. The results showed that specimens with dual phase Microstructure in the Core exhibited slightly lower tensile and yield strength but superior ductility without sacrificing surface hardness than a specimen with nearly fully martensitic Microstructure in the Core produced by conventional heat treatment involving quenching from ∼900 °C. Tensile properties increased with decreasing martensite particle size. The effects of martensite particle size on tensile fracture has also been observed. In the Core of the specimens with dual phase having fine and coarse Microstructures, microvoids formed at martensite particles, inclusions and martensite-ferrite interfaces in the necked region. Martensite particle size had an influence in determining martensite cracking. In the specimen with coarse martensite particles, interconnected martensite distributed along ferrite grain boundaries cracked easily and the fracture mode was predominantly cleavage type. Martensite cracking was less frequent and the microvoids were smaller and microvoid density were higher in the specimen with fine martensite particles and the form of fracture was dimple depression type. In this specimen, voids initiated mostly by decohesion at the interface, and by some examples of fracture of martensite. Microvoid coalescence was the dominant form of fracture in both fine and coarse Microstructures.. The specimen with nearly fully martensitic Microstructure in the Core produced by conventional heat treatment showed completely cleavage type fracture.
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surface carburised aisi 8620 steel with dual phase Core Microstructure
Materials Science and Technology, 2002Co-Authors: Mehmet Erdogan, S Tekeli, O Pamuk, A ErkanAbstract:AbstractIn this study, the production of dual phase steel structure in the Core of surface carburised AISI 8620 cementation steel and the effect of martensite volume fraction on tensile properties have been investigated. For these purposes, surface carburised (~0·8 wt-%C) specimens were oil quenched from 900°C to obtain a fully martensitic starting Microstructure. Then specimens were oil quenched from intercritical annealing temperatures of 731 or 746°C to produce dual phase steel structure in the Core of specimens with martensite fractions of ~25 or ~50 vol.-% and nearly wholly martensitic Microstructure at the surface. Generally, specimens with dual phase Microstructure in the Core exhibited slightly lower tensile and yield strengths but superior ductility without sacrificing surface hardness than those specimens with fully martensitic Microstructure in the Core produced by using conventional heat treatment involving quenching from 850 to 950°C. Also tensile strength increased and ductility decreased wi...
Mehmet Erdogan - One of the best experts on this subject based on the ideXlab platform.
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the effect of martensite volume fraction and particle size on the tensile properties of a surface carburized aisi 8620 steel with a dual phase Core Microstructure
Materials Characterization, 2002Co-Authors: Mehmet Erdogan, S TekeliAbstract:This study is focused on the production of a dual-phase steel structure in the Core of a surface-carburized AISI 8620 cementation steel and the effect of martensite volume fraction (MVF) and martensite particle size (MPS) on tensile properties. Experimental results showed that, compared with specimens with a fully martensitic Microstructure in the Core, those with a dual-phase Microstructure in the Core exhibited slightly lower tensile and yield strength but superior ductility without sacrificing surface hardness. In specimens with a dual-phase Microstructure in the Core, the tensile strength increased and ductility decreased with increasing MVF. Both the tensile strength and the ductility increased with decreasing MPS at constant MVF. The best combination of tensile strength and ductility was obtained with a fine MPS at a constant MVF of 25%.
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the effect of martensite particle size on tensile fracture of surface carburised aisi 8620 steel with dual phase Core Microstructure
Materials & Design, 2002Co-Authors: Mehmet Erdogan, S TekeliAbstract:In this study, the production of dual phase Microstructure in the Core of surface-carburised AISI 8620 cementation steel and the effect of martensite particle size at constant martensite volume fraction on tensile fracture have been investigated. The results showed that specimens with dual phase Microstructure in the Core exhibited slightly lower tensile and yield strength but superior ductility without sacrificing surface hardness than a specimen with nearly fully martensitic Microstructure in the Core produced by conventional heat treatment involving quenching from ∼900 °C. Tensile properties increased with decreasing martensite particle size. The effects of martensite particle size on tensile fracture has also been observed. In the Core of the specimens with dual phase having fine and coarse Microstructures, microvoids formed at martensite particles, inclusions and martensite-ferrite interfaces in the necked region. Martensite particle size had an influence in determining martensite cracking. In the specimen with coarse martensite particles, interconnected martensite distributed along ferrite grain boundaries cracked easily and the fracture mode was predominantly cleavage type. Martensite cracking was less frequent and the microvoids were smaller and microvoid density were higher in the specimen with fine martensite particles and the form of fracture was dimple depression type. In this specimen, voids initiated mostly by decohesion at the interface, and by some examples of fracture of martensite. Microvoid coalescence was the dominant form of fracture in both fine and coarse Microstructures.. The specimen with nearly fully martensitic Microstructure in the Core produced by conventional heat treatment showed completely cleavage type fracture.
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surface carburised aisi 8620 steel with dual phase Core Microstructure
Materials Science and Technology, 2002Co-Authors: Mehmet Erdogan, S Tekeli, O Pamuk, A ErkanAbstract:AbstractIn this study, the production of dual phase steel structure in the Core of surface carburised AISI 8620 cementation steel and the effect of martensite volume fraction on tensile properties have been investigated. For these purposes, surface carburised (~0·8 wt-%C) specimens were oil quenched from 900°C to obtain a fully martensitic starting Microstructure. Then specimens were oil quenched from intercritical annealing temperatures of 731 or 746°C to produce dual phase steel structure in the Core of specimens with martensite fractions of ~25 or ~50 vol.-% and nearly wholly martensitic Microstructure at the surface. Generally, specimens with dual phase Microstructure in the Core exhibited slightly lower tensile and yield strengths but superior ductility without sacrificing surface hardness than those specimens with fully martensitic Microstructure in the Core produced by using conventional heat treatment involving quenching from 850 to 950°C. Also tensile strength increased and ductility decreased wi...
Jiangde Peng - One of the best experts on this subject based on the ideXlab platform.
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influences of pump wavelength and environment temperature on the dual peaked brillouin property of a small Core Microstructure fiber
Optics Letters, 2007Co-Authors: Wei Zhang, Yin Wang, Yanyan Pi, Yidong Huang, Jiangde PengAbstract:The influences of the pump wavelength and temperature on the dual-peaked Brillouin property of a piece of a small-Core Microstructure fiber are investigated using the heterodyne method. The experimental results indicate that the dispersion characteristics of the acoustical modes participating in the Brillouin scattering are formed by the coupling of two acoustical modes with different acoustical field distributions. The influence of the pump wavelength can contribute to the variation of the acoustical mode wave vectors. On the other hand, the influence of the environment temperature can contribute to the shift of acoustical mode dispersion map by the variation of the material mechanical parameters and thermal expansion. The model and experiment results demonstrate that the height ratio of the two Brillouin peaks can be controlled by adjusting the pump wavelength or environment temperature.
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Influences of Pump Wavelength and Environment Temperature on the Dual-Peaked Brillouin Property of the Small Core Microstructure Fiber
2007 International Nano-Optoelectronics Workshop, 2007Co-Authors: Yin Wang, Wei Zhang, Yanyan Pi, Yidong Huang, Jiangde PengAbstract:The spontaneous Brillouin scattering spectrum of the Microstructure fiber (MSF) is experimentally investigated. The results demonstrate the height ratio of the two Brillouin peaks can be controlled by adjusting the pump wavelength or environment temperature.
A Erkan - One of the best experts on this subject based on the ideXlab platform.
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surface carburised aisi 8620 steel with dual phase Core Microstructure
Materials Science and Technology, 2002Co-Authors: Mehmet Erdogan, S Tekeli, O Pamuk, A ErkanAbstract:AbstractIn this study, the production of dual phase steel structure in the Core of surface carburised AISI 8620 cementation steel and the effect of martensite volume fraction on tensile properties have been investigated. For these purposes, surface carburised (~0·8 wt-%C) specimens were oil quenched from 900°C to obtain a fully martensitic starting Microstructure. Then specimens were oil quenched from intercritical annealing temperatures of 731 or 746°C to produce dual phase steel structure in the Core of specimens with martensite fractions of ~25 or ~50 vol.-% and nearly wholly martensitic Microstructure at the surface. Generally, specimens with dual phase Microstructure in the Core exhibited slightly lower tensile and yield strengths but superior ductility without sacrificing surface hardness than those specimens with fully martensitic Microstructure in the Core produced by using conventional heat treatment involving quenching from 850 to 950°C. Also tensile strength increased and ductility decreased wi...
Wei Zhang - One of the best experts on this subject based on the ideXlab platform.
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influences of pump wavelength and environment temperature on the dual peaked brillouin property of a small Core Microstructure fiber
Optics Letters, 2007Co-Authors: Wei Zhang, Yin Wang, Yanyan Pi, Yidong Huang, Jiangde PengAbstract:The influences of the pump wavelength and temperature on the dual-peaked Brillouin property of a piece of a small-Core Microstructure fiber are investigated using the heterodyne method. The experimental results indicate that the dispersion characteristics of the acoustical modes participating in the Brillouin scattering are formed by the coupling of two acoustical modes with different acoustical field distributions. The influence of the pump wavelength can contribute to the variation of the acoustical mode wave vectors. On the other hand, the influence of the environment temperature can contribute to the shift of acoustical mode dispersion map by the variation of the material mechanical parameters and thermal expansion. The model and experiment results demonstrate that the height ratio of the two Brillouin peaks can be controlled by adjusting the pump wavelength or environment temperature.
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Influences of Pump Wavelength and Environment Temperature on the Dual-Peaked Brillouin Property of the Small Core Microstructure Fiber
2007 International Nano-Optoelectronics Workshop, 2007Co-Authors: Yin Wang, Wei Zhang, Yanyan Pi, Yidong Huang, Jiangde PengAbstract:The spontaneous Brillouin scattering spectrum of the Microstructure fiber (MSF) is experimentally investigated. The results demonstrate the height ratio of the two Brillouin peaks can be controlled by adjusting the pump wavelength or environment temperature.