Transactions of Materials and Heat Treatment

Title：Analysis on tensile properties and hydrogen embrittlement fracture of coldrolled Fe-17Mn-0.05C high manganese steel for vehicle lightweight

Authors： Fang Xiaofen Wang Jingxia

Unit： Institute of Mechanical and Electronic Engineering Central Iron and Steel Research Institute

KeyWords： cold-rolled high manganese steel hydrogen embrittlement sensitivity tensile properties microstructure austenite stability

ClassificationCode：TG111；TG142

year,vol(issue):pagenumber：2019,44(1):157-161

Abstract：

For Fe-17Mn-0.05C steel obtained by hot rolling process, it was annealed firstly and then cold-rolled, and its tensile properties were analyzed at the two-phase region temperature of 650 ℃. Then, its hydrogen embrittlement sensitivity was tested by the slow strain rate tension (SSRT) method. The results show that many dislocations exist in Fe-17Mn-0.05C steel after cold rolling and annealing at 650 ℃ during 0.5 h, and its microstructure also occurs obvious change. When the annealing time increases to 300 min, almost all the carbides dissolve, and when the annealing time reaches 60 min, the upward trend of austenite proportion in the matrix appears to decrease. However, the cold-rolled Fe-17Mn-0.05C steel can achieve high mechanical strength, but its plasticity decreases and the elongation is usually less than 10%. After the annealing process, the plasticity of sample is significantly increased, and it increases to the maximum at 10 min. Thus, the annealed hydrogenfilled specimen changes significantly, and it forms the solid dimple to make the material obtain high hydrogen embrittlement sensitivity.

Funds：

钢铁研究总院科技基金资助项目(16S160988A)

方晓汾（1985-）,男，硕士，讲师，E-mail：fangxiaofen1985@hotmail.com

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