Abstract

We investigate the influence of constituent phases on the hydrogen-induced mechanical degradation in two ultra-high strength sheet steels. In the complex phase (CP) steel, of which microstructure can be regarded as monolithic in terms of hydrogen behaviors, the rate of hydrogen uptake gradually decreases with the charging time, while the transformation-induced plasticity (TRIP) steel exhibits a persistent hydrogen absorption up to the charging time of 48 h, which is attributed to the presence of austenite. The mechanical degradation of TRIP steel goes beyond that of the CP steel at charging time over 12 h, coincident with the condition in which the austenite contributes to the hydrogen uptake. Both the ultra-high strength and the presence of austenite have unfavorable influence on the hydrogen embrittlement. Therefore, in the TRIP steel, it is necessary to evaluate quantitatively the critical hydrogen concentration over which more care should be taken to reduce the risk of hydrogen-induced mechanical degradation.

Graphic abstract

中文翻译：

---

显微组织成分对超高强度钢板中氢诱导的机械降解的影响

摘要

我们研究了组成相对两种超高强度钢板中氢诱导的机械降解的影响。在复合相（CP）钢中，从氢行为的角度看，其微观结构可以看作是整体的，随着进料时间的增加，氢的吸收速率逐渐降低，而相变诱导可塑性（TRIP）钢则表现出持久的氢吸收充电时间长达48小时，这归因于奥氏体的存在。TRIP钢的机械降解在12小时的装料时间超过了CP钢，这与奥氏体有助于吸氢的条件相吻合。超高强度和奥氏体的存在对氢脆都有不利的影响。因此，在TRIP钢中，

图形摘要