Effects of Defects and Shot Peening on Fatigue Properties of Additively Manufactured CoCrFeNiTiMo-Based High-Entropy Alloys

IF 2.2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Engineering and Performance Pub Date : 2024-11-19 DOI:10.1007/s11665-024-10371-3

Miu Hayashi, Naoki Kurita, Tadatoshi Watanabe, Kenichi Yamamoto, Yuki Ogawa, Hiroyuki Akebono, Atsushi Sugeta

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Abstract

Recently, the automotive industry has increasingly focused on additive manufacturing as a new technology for reducing the weights of automobiles. In this study, fatigue tests were conducted on additively manufactured high-entropy alloys with different defect characteristics to clarify the relationships between their defect characteristics and fatigue strengths and to elucidate their fatigue fracture mechanisms. In addition, the effect of shot peening as an effective fatigue strength improvement method for an additively manufactured component was investigated. As a result, when defects formed by additive manufacturing were smaller than crystal grains, the numbers and sizes of defects affect fatigue crack growth behavior and barely affect fatigue life. Shot peening reduces the crack growth rate and is effective in extending the fatigue life. However, improvement in the fatigue limit is not achieved because the crack initiation site is a facet. From the above results, for defects smaller than the grain size, shot peening is a more effective method for improving fatigue life than reducing the numbers and sizes of defects.

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缺陷和喷丸强化对添加制造的钴铬镍钛钼基高熵合金疲劳性能的影响

最近，汽车行业越来越重视增材制造技术，将其作为减轻汽车重量的一项新技术。本研究对具有不同缺陷特征的增材制造高熵合金进行了疲劳试验，以明确其缺陷特征与疲劳强度之间的关系，并阐明其疲劳断裂机制。此外，还研究了喷丸强化作为一种有效的疲劳强度改进方法对快速成型部件的影响。结果表明，当增材制造形成的缺陷小于晶粒时，缺陷的数量和大小会影响疲劳裂纹的生长行为，几乎不会影响疲劳寿命。喷丸强化可降低裂纹生长率，并有效延长疲劳寿命。然而，由于裂纹起始点是一个面，因此无法改善疲劳极限。从上述结果来看，对于小于晶粒尺寸的缺陷，喷丸强化是比减少缺陷数量和尺寸更有效的提高疲劳寿命的方法。

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来源期刊

Journal of Materials Engineering and Performance 工程技术-材料科学：综合

CiteScore

3.90

自引率

13.00%

发文量

1120

审稿时长

4.9 months

期刊介绍： ASM International''s Journal of Materials Engineering and Performance focuses on solving day-to-day engineering challenges, particularly those involving components for larger systems. The journal presents a clear understanding of relationships between materials selection, processing, applications and performance. The Journal of Materials Engineering covers all aspects of materials selection, design, processing, characterization and evaluation, including how to improve materials properties through processes and process control of casting, forming, heat treating, surface modification and coating, and fabrication. Testing and characterization (including mechanical and physical tests, NDE, metallography, failure analysis, corrosion resistance, chemical analysis, surface characterization, and microanalysis of surfaces, features and fractures), and industrial performance measurement are also covered