Effect of tempering temperature and inclusions on hydrogen-assisted fracture behaviors of a low alloy steel

The tensile properties and fracture behaviors of the pre-charged hydrogen low alloy steel subjected to various tempering temperatures were investigated by slow strain rate tensile tests. Hydrogen was introduced into the samples by electrochemical method in 0.5 mol L−1 NaOH solution with 1 g L−1 CH4N2S for 24 h at room temperature (298 K). The results show that with an increase in tempering temperature, the resistance to hydrogen embrittlement...