Effect of microstructure on hydrogen diffusion behavior of GCr15 bearing steel

doi:10.13251/j.issn.0254-6051.2022.12.030

Abstract

Abstract: Electrochemical hydrogen permeation test of spheroidizing annealed, spheroidizing annealed+quenched and tempered (Q&T) GCr15 bearing steel was carried out to describe hydrogen diffusion behavior. The effects of microstructure and heat treatment status on hydrogen diffusion behavior were analyzed. The results show that the distribution of carbides in the spheroidizing annealed specimens has a greater effect on hydrogen diffusion behavior. Hydrogen diffuses fastest in banded carbides, while the network carbides along grain boundaries acts as hydrogen traps, trapping more hydrogen atoms. In the Q&T specimens, hydrogen diffuses fastest in banded undissolved carbides. The effective hydrogen diffusion coefficient decreases with the increase of the volume fraction of retained austenite. The hydrogen diffusion coefficient of the spheroidizing annealed tested steel is much higher than that of the Q&T steel. The number of hydrogen traps in Q&T specimens increases due to the presence of retained austenite, making hydrogen permeation more difficult.

Key words: GCr15 bearing steel, hydrogen embrittlement, carbides, hydrogen permeation, retained austenite

CLC Number:

TG111.91

Fu Siyu, Du Yu, Huang Zhiyuan, Lu Jianing, Du Linxiu. Effect of microstructure on hydrogen diffusion behavior of GCr15 bearing steel[J]. Heat Treatment of Metals, 2022, 47(12): 175-180.

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