Effect of tempering temperature on hydrogen diffusion and hydrogen embrittlement susceptibility of DP600 steel

doi:10.13251/j.issn.0254-6051.2021.02.015

Abstract

Abstract: Effect of tempering temperature on the hydrogen embrittlement susceptibility and hydrogen diffusion behavior of DP600 steel was explored by slow strain-rate tensile test and double cell hydrogen permeation test, and combined with SEM, TEM and EBSD techniques. The results show that the hydrogen embrittlement susceptibility and the effective hydrogen diffusion coefficient of the DP600 steel decrease with the increase of tempering temperature, which is mainly related to the decrease of concentrations of reversible hydrogen traps such as dislocation and small angle grain boundary, and the increase of concentrations of irreversible hydrogen traps such as carbide/matrix interface and large angle grain boundary. Among them, the dispersed carbides make the captured hydrogen atoms distribute evenly, which results in the decrease of hydrogen embrittlement susceptibility index from 44.6% (270 ℃) to 1.8% (350 ℃). Considering the influence of tempering temperature on the strength and hydrogen embrittlement susceptibility, the optimum tempering temperature of the DP600 steel is 330 ℃.

Key words: DP600 steel, tempering temperature, hydrogen diffusion, hydrogen embrittlement susceptibility

CLC Number:

TG111.91

Wang Zhen, Liu Jing, Huang Feng, Bi Yunjie, Ke Shuzhong. Effect of tempering temperature on hydrogen diffusion and hydrogen embrittlement susceptibility of DP600 steel[J]. Heat Treatment of Metals, 2021, 46(2): 87-94.

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