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Crystallographic texture evolution and martensite transformation in the strain hardening process of a ferrite-based low density steel

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Journal of Materials Science & Technology 2021年第19期78卷 247-259页

作者： Mingxiang Liu Changjiang Song Zhenshan Cui Center for Advanced Solidification Technology School of Materials Science and EngineeringShanghai UniversityShanghai200444China Institute of Forming Technology and Equipment School of Materials Science and EngineeringShanghai Jiao Tong University1954 Huashan RoadShanghai200030China

The strain-induced martensite transformation is of great importance in the strain hardening process of ferrite based low-density *** on the microstructure analysis,the texture evolution and martensite transformation behavior in the strain hardening process were *** results show that martensite transformation accompanied by TWIP effect and high density dislocations maintains the continuous hardening *** the strain increases,the texture of retained austenite evolves towards the F orientation{111},which is not conducive to martensite *** the strain of 5%,the number of austenite grains with high Schmid factor orientations is gradually increased,and then significantly reduced when the strain is over 10%due to the occurrence of martensitic transformation,which results in a high martensitic transformation ***,the unfavorable orientation and the reduced grain size of austenite slow down the martensite transformation at the final hardening ***,because of the coordination deformation of austenite grains,strain preferentially spreads between adjacent austenite ***,the martensite transformation rate in strain hardening process is dependent on the orientation and grain size evolution of austenite,leading to a differential contribution to each strain hardening stage.

关键词： low density steel Strain hardening Texture TRIP Deformation behavior

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Tensile Deformation Behavior of Fe-Mn-Al-C low density steels

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Journal of Iron and steel Research(International) 2016年第9期23卷 963-972页

作者： Xiao-feng ZHANG Hao YANG De-ping LENG Long ZHANG Zhen-yi HUANG Guang CHEN School of Metallurgical Engineering Anhui University of Technology Ma'anshan 243002 Anhui China School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 Jiangsu China

Room temperature tensile tests of Fe-Mn-A1 C low density steels with four different chemical compositions were conducted to clarify the dominant deformation mechanisms. Parameters like product of strength and elongation, as well as specific strength and curves of stress-strain relations were calculated. The microstructures and tensile fracture morphologies were observed by optical microscope, scanning electron microscope and transmission electron mi-croscope. The tensile behavior of low density steel was correlated to the microstructural evolution during plastic de formation, and the effects of elements, cooling process and heat treatment temperature on the mechanical properties of the steels were analyzed. The results show that the tensile strength of steels with different cooling modes is more than 1000 MPa. The highest tensile strength of 28Mn-12Al alloy reached 1230 MPa, with corresponding specific strength of 189.16 MPa· cm^3·g^-1 , while the specific strength of 28Mn-10Al alloy was 178.98 MPa·cm^3·g^-1 , and the excellent product of strength and elongation of 28Mn-SAl alloy was over 69.2 GPa·%. A large number of ferrite reduced the ductility and strain hardening rate of the alloy, while the existence of κ carbides may improve the strength but weaken the plasticity. Some fine κ carbides appeared in the water-quenched specimen, while coarse carbides were observed in the air-cooled specimen. High temperature heat treatment improved the decomposition ki- netics of 7 phase and the diffusion rate of carbon, thus speeded up the precipitation of fine κ carbides. The dominant deformation mechanism of low density steel was planar glide, including shear-band-induced plasticity and microband- induced plasticity.

关键词： low density steel carbide deformation mechanism planar glide shear band-induced plasticity microband-induced plasticity

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