The influence of tempering on the hydrogen embrittlement (HE) behavior of a hot-rolled and intercritically annealed medium-Mn steel (0.1C-5Mn) was investigated by slow strain rate tensile testing. It was observed that the absorbed diffusible hydrogen content remained almost unchanged with increasing tempering temperature. The susceptibility to HE evaluated by the relative total elongation loss is most significant for the as-annealed specimen, while tempering treatment can notably alleviate it. It is nearly immune to HE when the tempering temperature was increased up to 500 °C. The fraction of hydrogen-induced brittle fracture decreases with increasing tempering temperature. The enhanced resistance to HE of the tested steel is primarily ascribed to the microstructural evolution of retained austenite and cementite during the tempering process. It is thus proposed that the HE susceptibility of medium-Mn steel could be significantly reduced through suitable tempering treatment after intercritical annealing provided no notable loss of its superior strength-ductility balance.

通过慢应变速率拉伸试验研究了回火对热轧和临界退火的中锰钢（0.1C-5Mn）的氢脆性（HE）行为的影响。观察到随着回火温度的升高，吸收的扩散氢含量几乎保持不变。通过相对总伸长率损失评估的对HE的敏感性对于退火后的样品最为显着，而回火处理可以显着缓解。当回火温度提高到500°C时，它几乎不受HE的影响。氢致脆性断裂的分数随回火温度的升高而降低。被测钢对HE的抵抗力增强主要归因于回火过程中残余奥氏体和渗碳体的微观组织演变。