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Tianjin University Proposes New Anti-Cracking Strategy for IN738LC Nickel-Based Superalloy Additive Manufacturing
2026-05-25
A research team at Tianjin University has proposed a composition-process synergistic strategy to address hot cracking in IN738LC nickel-based superalloy during additive manufacturing, combining Co microalloying with hot isostatic pressing (HIP) post-treatment. The designed IN738LC-5Co alloy leverages a dual mechanism of solid-solution strengthening and γ' precipitate phase behavior control, where Co addition modulates phase transformation behavior and local stress distribution, while HIP post-treatment further heals microcracks and reduces transformation stresses. This results in excellent performance at 900°C, achieving 24% elongation and 566 MPa tensile strength, balancing high strength with low cracking susceptibility. The study provides a viable solution for additive manufacturing of non-weldable nickel-based superalloys and offers theoretical foundations and engineering guidance for future rapid industrial fabrication.
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天津大学提出IN738LC镍基超合金增材制造抗裂新策略
天津大学研究团队针对IN738LC镍基高温合金在增材制造中的热裂纹难题，提出通过Co微合金化与热等静压（HIP）后处理结合的成分-工艺协同策略。该研究设计的IN738LC-5Co合金通过固溶强化和γ'析出相行为调控双重机制，Co添加调节相变行为和局部应力分布，HIP后处理进一步愈合微裂纹、降低相变应力。最终在900℃高温下实现了24%延伸率和566 MPa抗拉强度的优异性能，兼具高强度与低开裂倾向。该研究为不可焊接镍基高温合金的增材制造提供了可行的解决方案，也为未来快速制造工业提供了理论基础与工程指导。