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| Research and modeling on correlation among microstructure, yield strength and process of bainite/martensite steel |
| Jia‑jia Qiu1, Min Zhang1, Gu‑hui Gao1, Zhun‑li Tan1, Bing‑zhe Bai1,2 |
| 1 School of Mechanical, Electronic and Control Engineering, Materials Science and Engineering Research Center, Beijing Jiaotong University, Beijing 100044, China; 2 Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China |
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Abstract The contributions of different strengthening mechanisms to yield strength of bainite/martensite multiphase rail steel with different finish cooling temperatures in the controlled cooling process were quantitatively investigated. Dislocation density and substructure size of the rail steel were measured by scanning electron microscopy, electron backscatter diffraction and X-ray diffraction. The results show that the dislocation density increases with the decrease in block width in rail steel. Based on the correlation among dislocation density, block width and yield strength, a physical model was proposed to predict the yield strength of rail steel. The variation of block width and dislocation density in different positions of rail head microstructure was integrated with temperature field simulation. Dislocation density and block width reveal significant correlations with the finish cooling temperature.
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| Cite this article: |
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Jia‑jia Qiu,Min Zhang,Gu‑hui Gao, et al. Research and modeling on correlation among microstructure, yield strength and process of bainite/martensite steel[J]. Journal of Iron and Steel Research International, 2020, 27(7): 834-841.
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| [1] |
Jian-feng Xiao, Hai-tao Cui, Hong-jian Zhang, Wei-dong Wen. A united tension/compression asymmetry micro-mechanical model for nickel-base single-crystal alloys[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(6): 621-630. |
| [2] |
Guo-chao Li, Xu Cheng, Hua-ming Wang. Improvement of proof-ultimate strength difference in laser additive manufactured Ti–6Al–2V–1.5Mo–0.5Zr–0.3Si alloy by tuning basketweave structure[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(6): 631-636. |
| [3] |
Xiao-hu Chen, Ping-ze Zhang, Dong-bo Wei, Xiao Huang, Feng Ding, Feng-kun Li, Xian-jun Dai, Zhang-zhong Wang. Correlation between crystal structure and mechanical performance of Cr-implanted 300M high-strength steel using X-ray diffraction method[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(10): 1106-1116. |
| [4] |
Zheng-yun Zhang,Jian-chun Cao,*,Zhong-hua Zhong,Xiao-long Zhou,Wei Chen,Yin-hui Yang. Tensile deformation behavior of high strength anti-seismic steel with multi-phase microstructure[J]. Chinese Journal of Iron and Steel, 2017, 24(1): 111-120. |
| [5] |
Ye-qing CAI, Jin-zhong SUN, Cheng-jie LIU, Shi-wei MA, Xi-cheng WEI. Relationship between Dislocation Density in P91 Steel and Its Nonlinear Ultrasonic Parameter[J]. Chinese Journal of Iron and Steel, 2015, 22(11): 1024-1030. |
| [6] |
ZONG Cui,ZHU Guo-hui,,MAO Wei-min. Effect of Crystallographic Texture on Anisotropy of Yield Strength in X100 Pipeline Steel[J]. Chinese Journal of Iron and Steel, 2013, 20(8): 66-71. |
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2020, Vol. 27 
