Thermal stability of Ni-based superalloys fabricated through additive manufacturing: A review

高温合金 微观结构 材料科学 蠕动 沉淀硬化 极限抗拉强度 晶界 材料的强化机理 再结晶(地质) 冶金 古生物学 生物
作者
Hedayat Hamdi,H.R. Abedi
出处
期刊:Journal of materials research and technology [Elsevier BV]
卷期号:30: 4424-4476 被引量:22
标识
DOI:10.1016/j.jmrt.2024.04.161
摘要

Additive manufacturing (AM) is a cutting-edge technique that builds parts by adding layers from a digital design and depositing materials selectively where required. AM is vital in industries like aerospace, healthcare, and automotive because of benefits like design flexibility, cost-efficiency, and customization over conventional methods. Ni-based superalloys AM processes involve phenomena like solidification, phase change, different microstructure characteristics, and melting pool boundaries, affecting both microstructure and mechanical properties. Ni-based superalloys are regarded as potential candidates for high-temperature applications, thanks to their capability to benefit from various strengthening mechanisms such as precipitation hardening and solid solution strengthening. This comprehensive review explores the thermal stability and high temperature softening resistance of additively manufactured (AMed) Ni-based superalloys, from microstructural and mechanical points of view. This review explores the thermal stability and high temperature softening resistance of additively manufactured Ni-based superalloys. It explores the interplay of alloying elements at high temperature, additive manufacturing parameters, and initial microstructure, focusing on grain boundary/sub-boundary networks evolution. The influence of solute drag effect, second phases Zenner pinning effect, and post-processing treatments on microstructural changes such as second phase characteristics, recrystallization (static and dynamic), grain growth phenomena, and textural variations is also analyzed. High temperature mechanical properties of AM-Ni-based superalloys are evaluated, including yield and tensile strength, elongation, work-hardening behavior, creep, and fatigue properties. Hydrogen embrittlement is a significant reason for failure, so this issue is briefly assessed in AM-Ni-based superalloys. Results show that understanding relationships between processing, microstructure, post-processing treatment, and properties is crucial for thermal stability control.
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