Effect of finishing rolling temperature on microstructure and mechanical properties of Cu-alloyed Fe-18Mn-0.6C TWIP steel

doi:10.13251/j.issn.0254-6051.2022.07.018

Abstract

Abstract: Effect of finishing rolling temperature (900 ℃ and 1000 ℃) on microstructure and mechanical properties of Cu-alloyed Fe-18Mn-0.6C TWIP steel was studied by means of XRD, OM, SEM, tensile test and impact test machine.The results show that the strength of TWIP steel is improved obviously with low temperature finishing rolling, but the elongation and product of strength and elongation are reduced.High temperature finishing rolling is more beneficial to improve plasticity and impact property at room temperature of the TWIP steel. Large-size austenite grains can be obtained with high temperature finishing rolling, which reduces the critical stress required by twinning and has higher strain strengthening ability.The dimples on the tensile fracture and impact fracture of the TWIP steel with high temperature are finishing rolling is larger and deeper than that of low temperature finishing rolling, which shows an excellent plasticity and toughness.

Key words: TWIP steel, finishing rolling temperature, mechanical twin, strain hardening rate

CLC Number:

TG142

Zhang Wenwen, Dong Futao, Liu Yunshuang, Tian Yaqiang, Chen Liansheng. Effect of finishing rolling temperature on microstructure and mechanical properties of Cu-alloyed Fe-18Mn-0.6C TWIP steel[J]. Heat Treatment of Metals, 2022, 47(7): 102-106.

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