预充氢金属疲劳损伤研究进展

A Review of Fatigue Damage in Pre-Charging Hydrogen Metal

摘要:

在高压氢环境和疲劳荷载作用下，金属承载件会出现材料疲劳性能减损，甚至失效。对临氢构件开展原位氢疲劳损伤研究存在氢安全方面的困难，因此近年来多采用对预充氢金属进行疲劳性能研究的替代方式。简要概述了氢损伤机理，介绍了金属预充氢试验方法，总结了预充氢情况下氢对金属高、低周疲劳性能影响的实验结果；归纳了建立预充氢金属的疲劳寿命模型，对金属氢损伤开展定量分析的研究现状；最后讨论了通过改变临氢材料内氢的渗入量和存在形式来抑制氢对金属的影响来提高临氢材料疲劳寿命的几种方法。

关键词:金属疲劳;预充氢;氢损伤;疲劳寿命模型

Abstract:

Under high-pressure hydrogen environment and fatigue load， metal load-bearing components will experience degradation or even failure in material fatigue performance. There are difficulties in hydrogen safety in conducting in-situ hydrogen fatigue damage research on hydrogen components. Therefore， in recent years， alternative methods have been adopted to study fatigue performance of pre-charged hydrogen metals. This paper briefly outlines the hydrogen damage mechanism， introduces the test method for pre-charged hydrogen metals， summarizes the experimental results of the impact of hydrogen on high-cycle and low-cycle fatigue performance under pre-charged hydrogen conditions， and the current research status of establishing a fatigue life model for pre-charged hydrogen metals and conducting quantitative analysis of metal hydrogen damage. Finally， it discusses several methods for improving the fatigue life of hydrogen components by suppressing the effect of hydrogen on metals by changing the infiltration amount and form of hydrogen in the material.

Key words:metal fatigue;pre-charging hydrogen;hydrogen damage;fatigue life model