Effects of defect size and location on high cycle fatigue life of a maraging stainless steel at ambient and cryogenic temperatures. (August 2022)

• Record Type: Journal Article
• Authors: Chang, Dong-Kai; Wang, Qiong-Qi; Chen, Hui; Zhang, Xian-Cheng; Wen, Jian-Feng; Tu, Shan-Tung
• Is Part Of: International journal of fatigue. Volume 161(2022)
• Publication Date: 2022-08
• Subjects: High cycle fatigue -- Cryogenic temperature -- Crack initiation -- Defect distribution -- Life prediction; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2022.106906
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: HCF tests are conducted on 142 specimens at ambient and cryogenic temperatures. Crack initiation mechanism at cryogenic temperature is investigated with emphasis. Reduction in HCF life caused by defect are examined by a normalization approach. The Z parameter is improved to suit different stress ratios and temperatures. Abstract: In some extreme service environments, materials with properties to resist cryogenic temperatures and intense vibration are required. In this study, high cycle fatigue (HCF) tests with different stress ratios were conducted on maraging stainless steel at both ambient and cryogenic temperatures. Fracture surface observation indicates that internal fatigue crack initiation prevails over surface initiation at cryogenic temperatures. A normalization method was proposed to examine the effects of defect size and location on the fatigue life. Furthermore, the Z parameter was modified to predict HCF life at different stress ratios and temperatures, with improved accuracy.