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Effect of hydrogen on very high cycle fatigue properties of 17-4 PH martensite stainless steel
International Journal of Fatigue ( IF 6 ) Pub Date : 2023-05-27 , DOI: 10.1016/j.ijfatigue.2023.107741
Ying Zheng, Huili Sun, Luchun Yan, Xiaolu Pang, Kewei Gao

Very high cycle fatigue properties of 17-4 PH stainless steel aged for 1 h and 4 h after hydrogen charging were studied. Results show that hydrogen reduces fatigue strength and changes crack initiation mode to mainly inducing by inclusions. The existence of intergranular facets on fracture surface indicates that hydrogen accelerates crack initiation and early crack growth. Hydrogen-granular bright facet (GBF) mechanism may be interpreted as lath martensite fracture and dislocation cells formation, where hydrogen-enhanced localized plasticity (HELP) and hydrogen-enhanced decohesion (HEDE) mechanisms occur. The degradation of hydrogen on fatigue properties is suppressed by hydrogen trapping effect of ε-copper precipitates.



中文翻译:

氢对17-4 PH马氏体不锈钢超高周疲劳性能的影响

研究了充氢后时效 1 h 和 4 h 的 17-4 PH 不锈钢的超高循环疲劳性能。结果表明,氢降低了疲劳强度并改变了裂纹萌生模式,主要由夹杂物诱发。断口上晶间小面的存在表明氢加速了裂纹的萌生和早期裂纹的扩展。氢晶粒亮面 (GBF) 机制可解释为板条马氏体断裂和位错细胞形成,其中发生氢增强局部塑性 (HELP) 和氢增强脱聚 (HEDE) 机制。ε-铜析出物的氢捕集作用抑制了氢对疲劳性能的降低。

更新日期:2023-05-28
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