Simultaneous strength optimization and recrystallization prevention in induction-heating-assisted laser additively manufactured Ni-based superalloys

作者：Yizhou Zhao, Zhaowei Wang, Lin Shi, Shubo Gao, Dan Qian, Kai Chen, Yao Li, Wolfgang Pantleon · 发表于：Materials Research Letters · 年份：2025 · DOI：10.1080/21663831.2025.2491566 · 被引用次数：13 · 研究领域：Additive Manufacturing Materials and Processes、High Temperature Alloys and Creep、High Entropy Alloys Studies

Induction heating favors crack inhibition for laser additive manufacturing of Ni-based superalloys but may negatively influence columnar grain growth and mechanical properties. Here, by induction heating at a proper temperature during laser additive manufacturing, superalloys with a directionally solidified grain structure are obtained. Optimized γ′-precipitate size grants them higher microhardness than their counterparts either cast or additively manufactured without concurrent induction heating. Furthermore, lowered built-in dislocation density reduces the driving force for recrystallization. The combination of a maintained columnar grain structure, an increased microhardness, and a decreased risk of recrystallization offers a valuable pathway for advancing additive manufacturing of superalloys.