High fatigue resistance in a titanium alloy via near-void-free 3D printing

• 成果类型: Article
• 署名作者: Qu, Zhan; Zhang, Zhenjun; Liu, Rui; Xu, Ling; Zhang, Yining; Li, Xiaotao; Zhao, Zhenkai; Duan, Qiqiang; Wang, Shaogang; Li, Shujun; Ma, Yingjie; Shao, Xiaohong; Yang, Rui; Eckert, Juergen; Ritchie, Robert O.; Zhang, Zhefeng
• 署名单位: Chinese Academy of Sciences; Institute of Metal Research, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Shenyang Institute of Engineering; ShanghaiTech University; Austrian Academy of Sciences; University of Leoben; University of California System; University of California Berkeley
• 刊物名称: Nature
• ISSN/ISSBN: 0028-4070
• DOI: 10.1038/s41586-024-07048-1
• 发表日期: 2024-02-29
• 关键词: mechanical-properties; high-strength; microstructure; performance; electron; origins

摘要

The advantage of 3D printing-that is, additive manufacturing (AM) of structural materials-has been severely compromised by their disappointing fatigue properties1,2. Commonly, poor fatigue properties appear to result from the presence of microvoids induced by current printing process procedures3,4. Accordingly, the question that we pose is whether the elimination of such microvoids can provide a feasible solution for marked enhancement of the fatigue resistance of void-free AM (Net-AM) alloys. Here we successfully rebuild an approximate void-free AM microstructure in Ti-6Al-4V titanium alloy by development of a Net-AM processing technique through an understanding of the asynchronism of phase transformation and grain growth. We identify the fatigue resistance of such AM microstructures and show that they lead to a high fatigue limit of around 1 GPa, exceeding the fatigue resistance of all AM and forged titanium alloys as well as that of other metallic materials. We confirm the high fatigue resistance of Net-AM microstructures and the potential advantages of AM processing in the production of structural components with maximum fatigue strength, which is beneficial for further application of AM technologies in engineering fields. We successfully rebuild an approximate void-free additive manufacturing microstructure in Ti-6Al-4V titanium alloy by the development of a void-free additive manufacturing processing technique through an understanding of the asynchronism of phase transformation and grain growth.