Enhanced oxidation resistance of additively manufactured Inconel 718 superalloy by surface mechanical attrition treatment

作者：Chuan Guo, Wang Jingchen, Hongxing Lu, Yanmin Wang, Jianing Bai, Gan Li, Yu Yin, Lu Yao, Qiang Zhu, Jian Lü · 发表于：Corrosion Science · 年份：2025 · DOI：10.1016/j.corsci.2025.112719 · 被引用次数：21 · 研究领域：Surface Treatment and Residual Stress、Additive Manufacturing Materials and Processes、Metal Alloys Wear and Properties

This study investigated the effects of surface mechanical attrition treatment (SMAT) on the antioxidation performance of additively manufactured Inconel 718 parts. The results show that SMAT generated a nanograin layer near the part surface with high densities of low-angle grain boundaries, plastic strain and lattice distortion. Oxidation resistance was improved owing to that a continuous oxide scale was quickly formed to protect the underlying materials at the early stage of oxidation by the nanosized microstructure. Moreover, adhesion between the oxide scale and the parent alloy was enhanced because of a high level of compressive residual stress induced by SMAT. • The IN718 superalloy processed by PBF-LB was treated using SMAT. • SMAT produced a hardness-enhanced layer with large compressive residual stress. • The part treated using SMAT had a better oxidation resistance at 850 ℃. • Nano-sized microstructure and high residual stress were the main contributions.