The influence of hydrogen on the mechanical performance of a hot-rolled martensitic steel was studied by means of constant extension rate test (CERT) and constant load test (CLT) followed with thermal desorption spectroscopy measurements. The steel shows a reduction in tensile strength up to 25% of ultimate tensile strength (UTS) at critical hydrogen concentrations determined to be about 1.1 wt.ppm and 50% of UTS at hydrogen concentrations of 2 wt.ppm. No further strength degradation was observed up to hydrogen concentrations of 4.8 wt.ppm. It was observed that the interplay between local hydrogen concentrations and local stress states, accompanied with the presence of total average hydrogen reducing the general plasticity of the specimen are responsible for the observed strength degradation of the steel at the critical concentrations of hydrogen. Under CLT, the steel does not show sensitivity to hydrogen at applied loads below 50% of UTS under continuous electrochemical hydrogen charging up to 85 h. Hydrogen enhanced creep rates during constant load increased linearly with increasing hydrogen concentration in the steel.

中文翻译：

---

2200 MPa和600 HBW马氏体超高强钢临界氢浓度的测定及其对力学性能的影响

氢对热轧马氏体钢机械性能的影响通过恒定延伸率试验 (CERT) 和恒定载荷试验 (CLT) 以及随后的热解吸光谱测量进行研究。在确定为约 1.1 wt.ppm 的临界氢浓度下，该钢显示出抗拉强度降低高达极限抗拉强度 (UTS) 的 25%，而在氢浓度为 2 wt.ppm 时，该钢的抗拉强度降低了 50%。在氢浓度达到 4.8 重量 ppm 时，没有观察到进一步的强度下降。据观察，局部氢浓度和局部应力状态之间的相互作用，伴随着总平均氢的存在降低了试样的总体塑性，这是观察到的钢在临界氢浓度下强度下降的原因。在 CLT 条件下，钢在低于 50% UTS 的应用负载下，在长达 85 小时的连续电化学氢充电下，对氢不敏感。在恒定载荷期间，氢增强蠕变速率随着钢中氢浓度的增加而线性增加。