High temperature thermoplastic of medium manganese steel for shaft forgings

doi:10.13251/j.issn.0254-6051.2022.10.009

Abstract

Abstract: High temperature thermoplastic of medium manganese steel for shaft forgings was studied. High temperature tensile tests were carried out on the tested steel at different strain rates and different temperatures, and the thermoplastic curves of the tested steel under different conditions were drawn. The fracture mechanism of the tested steel was analyzed by studying the morphology and structure distribution of high temperature tensile fracture. The results show that the reduction of area of the tested steel is more than 60% in the range of 650-1200 ℃, and the steel has good thermoplasticity and no brittleness temperature zone. The microstructure near high temperature tensile fracture of the tested steel is martensitic and there is a small amount of proeutectoid ferrite in microstructure corresponding to the temperature point (750, 900 ℃) with poor thermoplasticity. The fracture mode of the tested steel is transgranular ductile fracture in the range of 650-1050 ℃, but intergranular fracture in the range of 1100-1200 ℃.

Key words: medium manganese steel, high temperature tensile, high temperature thermoplastic, fracture morphology, fracture mode

CLC Number:

TG142.33

Luan Yuqi, Wu Hongyan, Wang Wanqi, Gao Xiuhua, Du Linxiu. High temperature thermoplastic of medium manganese steel for shaft forgings[J]. Heat Treatment of Metals, 2022, 47(10): 52-57.

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