Stress rupture behavior of SLM deposited IN738 superalloy via hot isostatic pressing and heat treatment

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-09-23 DOI:10.1016/j.msea.2025.149172

Huan Zhang , Wei Song , Xue Zhang , Jingjing Liang , Yanhong Yang , Jun Xie , Nannan Lu , Lin Zhou , Ruizhi Chen , Yizhou Zhou , Wei Xu , Jinguo Li

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引用次数: 0

Abstract

Inconel 738 (IN738) superalloys with a high γ′ phase proportion, manufactured by selective laser melting (SLM), demonstrate excellent quasistatic tensile properties, but suffer from poor creep rupture properties, seriously limiting their application in aerospace. Here, the present hot isostatic pressing (HIP) and two-step heat treatment (sub-solvus solution and aging) approach enhances the stress rupture resistance at 760 °C and 590 MPa through precise control of a bimodal γ′ distribution and dual-carbide precipitation. The stress rupture life of the post-processed samples is improved to 133 % of that of conventionally cast IN738 alloys at 760 °C and 590 MPa. This improvement is mainly attributed to the dispersion of nano-MC carbides within the grains and the precipitation of M₂₃C₆ carbides, along with a significant bimodal distribution of γ′ phase, which hinders dislocation motion by introducing obstacles and enhances stress rupture resistance. These findings highlight the crucial role of HIP and two-step heat treatment in optimizing the properties of SLM-fabricated superalloys.

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热等静压和热处理对SLM沉积IN738高温合金应力断裂行为的影响

采用选择性激光熔化法制备的高γ′相比例高温合金IN738 （IN738）具有优异的准静态拉伸性能，但蠕变断裂性能差，严重限制了其在航空航天领域的应用。本文采用热等静压（HIP）和两步热处理（亚溶溶和时效）方法，通过精确控制γ′双峰分布和双碳化物析出，提高了合金在760℃和590 MPa下的抗应力断裂能力。在760℃、590 MPa条件下，后处理试样的应力断裂寿命提高到常规铸造IN738合金的133%。这种改善主要是由于纳米mc碳化物在晶粒内的分散和M23C6碳化物的析出，以及γ′相的显著双峰分布，通过引入障碍物阻碍了位错运动，增强了抗应力断裂能力。这些发现强调了HIP和两步热处理在优化slm制备的高温合金性能方面的关键作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.