Effect of tempering temperature on microstructure and mechanical properties of EA4T axle steel

doi:10.13251/j.issn.0254-6051.2020.05.024

Abstract

Abstract: EA4T axle steel was quenched and tempered at different tempering temperatures (500, 550, 600, and 650 ℃). The microstructure and mechanical properties of the material were tested and analyzed by means of OM, SEM, tensile test and impact test to study the effect of tempering temperature on microstructure and mechanical properties of the EA4T steel. The results show that as the tempering temperature increases, the sorbite structure is formed, which induces the decrease of strength and the increase of toughness and plasticity. The impact fracture morphology of the EA4T steel is dimpled when tempered at above 600 ℃. The empirical formula of tensile strength and hardness of the EA4T steel after tempering treatment is as follow: R_m =2.9477V+45.59.

Key words: EA4T steel, axle steel, tempering temperature, microstructure, mechanical properties

CLC Number:

TG156.5

Ni Qixiao, Wang Zhanyong, Wang Zemin, Wang Binjun, Liu Min, Zhou Bing. Effect of tempering temperature on microstructure and mechanical properties of EA4T axle steel[J]. Heat Treatment of Metals, 2020, 45(5): 129-132.

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