Effect of tempering temperature on induction quenched and tempered microstructure and mechanical properties of 42CrMo steel bar

doi:10.13251/j.issn.0254-6051.2021.11.031

Abstract

Abstract: Effect of tempering temperature (500, 550, 600, 650, 700 ℃) on microstructure and mechanical properties of the 42CrMo steel bar was studied by medium frequency induction quenching and tempering. The results show that as the tempering temperature increases, the microstructure of the 42CrMo steel keeps as tempered sorbite. The carbides gradually change from unevenly distributed fine needle shape to short rod shape, and the aspect ratio decreases, then transform into a dispersed granular shape at 600 ℃, and segregate at 650 ℃, coarsen rapidly at 700 ℃. With the increase of induction tempering temperature, the hardness, tensile strength and yield strength show a continuous downward trend, while the elongation after fracture and the percentage reduction of area show a continuous small upward trend.

Key words: 42CrMo steel bar, induction quenching and tempering, tempering temperature, microstructure, mechanical properties

CLC Number:

TG156

Zhang Qing, Cao Pei. Effect of tempering temperature on induction quenched and tempered microstructure and mechanical properties of 42CrMo steel bar[J]. Heat Treatment of Metals, 2021, 46(11): 182-185.

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