Formation of reversed austenite and its effect on properties of Cr13Ni4Mo steel

doi:10.13251/j.issn.0254-6051.2023.01.016

Abstract

Abstract: Formation law, mechanism of reversed austenite and mechanical properties of Cr13Ni4Mo steel were studied by means of XRD, SEM, EBSD and tensile test. The results show that no reversed austeniteis formed in the Cr13Ni4Mo steel after first tempering at 550-730 ℃. When first tempering at 630 ℃ and second tempering at 530-630 ℃, the content of reversed austenite in the steel increases firstly and then decreases with the increase of the second tempering temperature, and the tensile strength, elongation and product of strength and elongation also increase first and then decrease correspondingly. When the second tempering temperature approaches 590 ℃, the content of reversed austenite reaches the peak and the comprehensive mechanical properties are the best. The reversed austenite is mainly formed in the martensite lath with shear mechanism when the second tempering temperature is 550 ℃, and with the increase of second tempering temperature, the formation of reversed austenite is gradually dominated by diffusion mechanism.

Key words: reversed austenite, second tempering, Cr13Ni4Mo steel

CLC Number:

TG142.1

Zhao Shuai, Li Qingchun, An Haoying, Chen Shuying, Chang Guowei. Formation of reversed austenite and its effect on properties of Cr13Ni4Mo steel[J]. Heat Treatment of Metals, 2023, 48(1): 95-99.

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