| Correlation between microstructure and impact toughness of weld heat-affected zone in 5 wt.% manganese steels |
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| 引用本文： | Jun-hui Li,Hong-hong Wang,Qiang Luo,Li Li,Chao Sun,R.D.K. Misra. Correlation between microstructure and impact toughness of weld heat-affected zone in 5 wt.% manganese steels[J]. 钢铁研究学报(英文版), 2019, 26(7): 761-770 |
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| 作者姓名： | Jun-hui Li Hong-hong Wang Qiang Luo Li Li Chao Sun R.D.K. Misra |
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| 作者单位： | The State Key Laboratory of Refractories and Metallurgy;Research Institute of Nanjing Iron and Steel Co.;Laboratory for Excellence in Advanced Steel Research |
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| 基金项目： | Authors gratefully acknowledge the support from National Natural Science Foundation of China |
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| 摘 要： | The microstructure in welding heat-affected zones of 5 wt.% manganese steels was studied, and its effect on impact toughness was analyzed. The simulated coarse-grained heat-affected zone (CGHAZ) had the lowest impact toughness of ~39 J at — 40℃ because of coarse-grained structure and least volume fraction of retained austenite (RA) of 1.2 vol.%. The impact toughness of simulated intercritical heat-affected zone (ICHAZ) and fine-grained heat-affected zone (FGHAZ) were ~165 and ~45 J, respectively, at — 40℃. The effective grain size of simulated FGHAZ was smaller than that of the simulated ICHAZ. Furthermore, microstructural investigation revealed that the simulated FGHAZ and ICHAZ had similarity in volume fraction and stability of RA. However, tempered martensite was present in ICHAZ and absent in FGHAZ. It is proposed that the presence of tempered martensite contributed to good impact toughness in simulated ICHAZ.
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| 关 键 词： | 5 wt.% manganese steel Welding heat-affected zone RETAINED AUSTENITE Tempered MARTENSITE Impact TOUGHNESS |
Correlation between microstructure and impact toughness of weld heat-affected zone in 5 wt.％ manganese steels |
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