Design of Additively Manufactured Ni-Based Superalloys Based on Solid Solution Elements
Received date: 2024-07-17
Revised date: 2024-09-19
Online published: 2025-01-20
Supported by
National Science and Technology Major Project(Y2019-VII-0011-0151);National Key Research and Development Program of China(2021YFB3702503)
Cracking and insufficient strength at high temperatures are major challenges in the manufacturing of additive-manufactured nickel-based superalloys, but can be effectively solved by a composition design based on solid solution elements. In this study, the amounts of γ′ phases, cracks, lattice mismatch, and topological close-packed (TCP) phase in additively manufactured Ni-based superalloys were investigated through thermodynamic calculations, OM, XRD, SEM,TEM, and tensile property tests. The preliminarily optimized ZGH-10 alloy exhibited a good microstructure and excellent tensile properties, with a solid solution strength and crack area percentage of 236 MPa and (1.3 × 10-4)%, respectively. The lattice mismatch of the ZGH-10 alloy (-0.26%) contributes to square γ' phases. After thermal exposure to 1000 oC for 500 h, no TCP phase precipitation appears in the ZGH-10 alloy. At 25 oC, 760 oC, and 1000 oC, the ZGH-10 alloy delivers tensile strengths of 1290, 1089, and 555 MPa, respectively, and elongations of 17.0%, 10.8%, and 28.5%, respectively, showing excellent strength and ductility of the alloy.
ZHANG Xue , LIANG Jingjing , ZHAO Yusong , ZHANG Huan , MU Yahang , ZHOU Yizhou , SUN Xiaofeng , LI Jinguo . Design of Additively Manufactured Ni-Based Superalloys Based on Solid Solution Elements[J]. Acta Metall Sin, 2026 , 62(8) : 1395 -1404 . DOI: 10.11900/0412.1961.2024.00239
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