基于固溶元素增材制造镍基高温合金的成分设计
收稿日期: 2024-07-17
修回日期: 2024-09-19
网络出版日期: 2025-01-20
基金资助
国家科技重大专项项目(Y2019-VII-0011-0151);国家重点研发计划项目(2021YFB3702503)
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)
易形成裂纹和高温强度不足是增材制造镍基高温合金面临的重大难题，基于固溶元素的成分设计是解决这两大难题的有效途径之一。本工作结合热力学计算，通过OM、XRD、SEM、TEM以及拉伸实验测试分析了增材制造镍基高温合金中γ'相含量、裂纹、错配度和拓扑密排(TCP)相析出情况。结果表明，ZGH-10合金的固溶强度为236 MPa，裂纹面积分数为(1.3 × 10-4)%；错配度为-0.26%，γ'相为方形。在1000 ℃下热暴露500 h时，ZGH-10合金中无TCP相析出。在25、760和1000 ℃下，ZGH-10合金的抗拉强度分别为1290、1089和555 MPa，延伸率分别为17.0%、10.8%和28.5%，表现出优异的强度与塑性。
张雪 , 梁静静 , 赵玉淞 , 章环 , 穆亚航 , 周亦胄 , 孙晓峰 , 李金国 . 基于固溶元素增材制造镍基高温合金的成分设计[J]. 金属学报, 2026 , 62(8) : 1395 -1404 . DOI: 10.11900/0412.1961.2024.00239
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.
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