文献类型：期刊文献

英文题名：New insights into fatigue anisotropy of an additively manufactured medium-entropy alloy: from the perspectives of crack initiation and crack propagation

作者：Qiu, Jihang[1];Lu, Tiwen[1];Yao, Ning[1];Chen, Xiyu[1];Li, Kaishang[1];Sun, Binhan[1];Chen, Yufei[1];Zhang, Xian-Cheng[1];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2024

卷号：19

期号：1

外文期刊名：VIRTUAL AND PHYSICAL PROTOTYPING

收录：;EI(收录号：20244317232366);WOS:【SCI-EXPANDED(收录号:WOS:001333183300001)】；

基金：This work was financially supported by the Key Technologies Research and Development Program (2022YFB4602100), National Natural Science Foundation of China (Nos. 52205152, No. U21B2077, 52275147), Science Center for gas turbine project from China (Project No. P2022-C-III-002-001), Shanghai Pujiang Programme (No. 800 3PJD023), Natural Science Foundation of Ningbo (grant number 2023J008).

语种：英文

外文关键词：Additive manufacturing; fatigue anisotropy; microstructure; crack initiation; crack propagation

摘要：The present work investigates anisotropic fatigue properties of an additively manufactured (AM) medium-entropy alloy (MEA). The fatigue properties of the materials in 0 degrees, 45 degrees and 90 degrees orientations with respect to the build layers were measured. In order to discover the dominant factors for stress level-dependent fatigue anisotropy, crystal plasticity finite element simulations and fatigue crack growth (FCG) experiments were used to evaluate crack initiation and crack propagation behaviours, respectively. The main conclusions are summarised as follows: First, in comparison to grain anisotropy, the difference in fatigue initiation stage is controlled by defect anisotropy. Second, the direct cause of the difference in the FCG rate is considered to be the differences in deflection angle, affected by the incompatibility of the slip planes between adjacent grains. Third, the AM-MEA displays a stress level-dependent fatigue anisotropy. At high-stress level, the fatigue life of the MEA-45 degrees specimen is significantly higher than that of MEA-0 degrees and MEA-90 degrees, while at low-stress levels, the fatigue resistance of MEA-0 degrees is similar to that of MEA-45 degrees. Stress level-dependent fatigue anisotropy is controlled by different ratios of crack initiation and crack propagation. Our work proposes a novel research strategy that qualitatively evaluates fatigue anisotropy of AM materials.