Effect of tempering temperature on hydrogen embrittlement sensitivity of a high strength low alloy steel containing V and Nb

doi:10.13251/j.issn.0254-6051.2023.03.003

Abstract

Abstract: Effect of tempering temperature (560, 600 and 640 ℃) after 920 ℃ ice-water quenching on hydrogen diffusion and hydrogen embrittlement sensitivity of a high strength low alloy steel with 0.15%V and 0.05%Nb (mass fraction) was investigated by hydrogen penetration and dynamic hydrogen charging tensile test, and the microstructure of the tempered specimens was observed and analyzed by metallographic microscope, X-ray diffractometer and transmission electron microscope. The results show that with the increase of tempering temperature, the hydrogen diffusion coefficient increases, the hydrogen diffusion activation energy and hydrogen embrittlement sensibility decrease, which is because that with the increase of tempering temperature, the decrease of dislocation density reduces the density of hydrogen traps, and the diffusible hydrogen content decreases under the same hydrogen charging condition.

Key words: high strength low alloy steel, hydrogen diffusion, tempering temperature, hydrogen embrittlement sensitivity

CLC Number:

Wang Zhaofeng, Cheng Xiaoying, Li Xiaoliang, Peng Hao, Cai Zhenxiang. Effect of tempering temperature on hydrogen embrittlement sensitivity of a high strength low alloy steel containing V and Nb[J]. Heat Treatment of Metals, 2023, 48(3): 12-18.

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