Effect of hydrogen on very high cycle fatigue properties of 17-4 PH martensite stainless steel

被引：1
|
作者：
Zheng, Ying [2 ]
Sun, Huili [2 ]
Yan, Luchun [2 ]
Pang, Xiaolu [1 ,3 ]
Gao, Kewei [1 ,2 ]
机构：
[1] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, Beijing 100083, Peoples R China
[2] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[3] Univ Sci & Technol Beijing, Sch Math & Phys, Beijing 100083, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 174卷
基金：
中国国家自然科学基金;
关键词：
Very high cycle fatigue properties; Martensite stainless steel; Hydrogen; GBF formation; & epsilon; -copper precipitates; HIGH-STRENGTH STEELS; SUBSURFACE CRACK INITIATION; INCLUSION SIZE; SMALL DEFECTS; LIFE REGIME; MECHANISM; BEHAVIOR; MICROSTRUCTURE; PROPAGATION; EMBRITTLEMENT;
D O I：
10.1016/j.ijfatigue.2023.107741
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
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 e-copper precipitates.
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页数：9
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