Effect of intercritical tempering temperature on microstructure and mechanical properties of Fe-4Mn-1.2Cr-0.3Cu-0.6Ni medium manganese steel

doi:10.13251/j.issn.0254-6051.2022.02.017

Abstract

Abstract: Effect of intercritical tempering temperature on microstructure and mechanical properties of Fe-4Mn-1.2Cr-0.3Cu-0.6Ni medium manganese steel was studied. The tested steel was prepared by direct quenching after hot rolling and intercritical tempering. The microstructure and mechanical properties of the quenched after rolling and tempered tested steels were characterized by means of optical microscope (OM), scanning function of electron probe microanalyzer (EPMA), transmission electron microscope (TEM), tensile test and impact test. The results show that the lath martensite with higher dislocation density can be obtained in the tested steel quenched after hot rolling, and the composite structure of retained austenite distributed on the tempered martensite matrix can be formed after intercritical tempering. With the increase of intercritical tempering temperature, the tensile strength of the tested steel increases, while the yield strength first decreases and then increases. The change trend of elongation is related to the content of retained austenite in the tested steel. The impact property first increases and then decreases with the increase of intercritical tempering temperature. The tensile properties of the tested steel tempered at 630 ℃ is the best, but the impact property of the tested steel tempered at 650 ℃ is the best, so that the optimum intercritical tempering temperature range is determined to be 630-650 ℃.

Key words: medium manganese steel, retained austenite, TRIP effect, intercritical tempering, mechanical properties

CLC Number:

TG146.2

Liu Tao, Wu Hongyan, Gao Xiuhua, Qin Dongyang, Du Linxiu. Effect of intercritical tempering temperature on microstructure and mechanical properties of Fe-4Mn-1.2Cr-0.3Cu-0.6Ni medium manganese steel[J]. Heat Treatment of Metals, 2022, 47(2): 91-98.

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