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Improvement of notch fatigue properties of ultra-high CM400 maraging steel through shot peening
Duan, Qi-qiang; Wang, Bin; Zhang, Peng; Yang, Ke; Zhang, Zhe-Feng; Zhang, P; Zhang, ZF (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China.
2017-12-14
Source PublicationCAMBRIDGE UNIV PRESS
ISSN0884-2914
Volume32Issue:23Pages:4424-4432
AbstractShot-peened CM400 maraging steel was used to study the mechanism of enhanced notch fatigue properties of ultra-high strength materials. After shot peening, the specimen surface became rougher, but the transversal machining traces were reduced. The yield strength was slightly improved while the ultimate tensile strength and hardness maintained constant; as a result, the fatigue limit was promoted by about 1.5 times. The nucleated sites of the fatigue fracture were partly changed from the surface to subsurface/interior of the specimen. To further analyze the influencing factors of fatigue properties, the fatigue damage process may be resolved to two aspects: (a) fatigue damage rate affected by shear deformation and (b) fatigue damage tolerance controlled by the dilatation fracture process. Considering the stress state near the notch tip, the hydrostatic stress and maximum shear stress are considered for better understanding these two aspects. It is observed that the fatigue damage tolerance increased while the fatigue damage rate decreased after shot peening. Therefore, the notch fatigue properties of CM400 maraging steels can effectively be improved.; Shot-peened CM400 maraging steel was used to study the mechanism of enhanced notch fatigue properties of ultra-high strength materials. After shot peening, the specimen surface became rougher, but the transversal machining traces were reduced. The yield strength was slightly improved while the ultimate tensile strength and hardness maintained constant; as a result, the fatigue limit was promoted by about 1.5 times. The nucleated sites of the fatigue fracture were partly changed from the surface to subsurface/interior of the specimen. To further analyze the influencing factors of fatigue properties, the fatigue damage process may be resolved to two aspects: (a) fatigue damage rate affected by shear deformation and (b) fatigue damage tolerance controlled by the dilatation fracture process. Considering the stress state near the notch tip, the hydrostatic stress and maximum shear stress are considered for better understanding these two aspects. It is observed that the fatigue damage tolerance increased while the fatigue damage rate decreased after shot peening. Therefore, the notch fatigue properties of CM400 maraging steels can effectively be improved.
description.department[duan, qi-qiang ; wang, bin ; zhang, peng ; yang, ke ; zhang, zhe-feng] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china
KeywordFatigue Steel Strength
Subject AreaMaterials Science, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China (NSFC) [51331007, 51301179]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78935
Collection中国科学院金属研究所
Corresponding AuthorZhang, P; Zhang, ZF (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Duan, Qi-qiang,Wang, Bin,Zhang, Peng,et al. Improvement of notch fatigue properties of ultra-high CM400 maraging steel through shot peening[J]. CAMBRIDGE UNIV PRESS,2017,32(23):4424-4432.
APA Duan, Qi-qiang.,Wang, Bin.,Zhang, Peng.,Yang, Ke.,Zhang, Zhe-Feng.,...&Zhang, ZF .(2017).Improvement of notch fatigue properties of ultra-high CM400 maraging steel through shot peening.CAMBRIDGE UNIV PRESS,32(23),4424-4432.
MLA Duan, Qi-qiang,et al."Improvement of notch fatigue properties of ultra-high CM400 maraging steel through shot peening".CAMBRIDGE UNIV PRESS 32.23(2017):4424-4432.
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