The influences of aging treatment on the serrated flow of a superalloy specially designed for additive manufacturing

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering: A Pub Date : 2025-02-02 DOI:10.1016/j.msea.2025.147984

Bin Wu , Jingjing Liang , Yanhong Yang , Jinguo Li , Xiaofeng Sun

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Abstract

Additive manufacturing (AM) superalloys is the materials research frontier full of challenges nowadays. The present paper investigates the tensile deformation behavior of a novel superalloy specifically developed for additive manufacturing. Two kinds of sample state are used: the as-built (directly obtained from AM) and the heat-treated (endured aging treatment at 870 °C for 16 h). During tensile tests at 650 °C and 700 °C, two different strain rates were adopted. It was found that the strength and plasticity of the heat-treated alloy were significantly improved compared with that of the as-built. Furthermore, the as-built alloy exhibited significant serrated plastic flow, the types of serrations varied with the applied strain rate. The serrations were effectively suppressed through aging treatment. To reveal the underlying mechanisms, the microstructures of both as-built and heat-treated alloy were characterized and analyzed. The formation of serrations were ascribed to dynamic strain aging (DSA). This work provides implications for tailoring the microstructure in additively manufactured components to improve properties, thus supporting the practical application of additive manufacturing superalloys.

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时效处理对增材制造专用高温合金锯齿状流动的影响

增材制造高温合金是当今充满挑战的材料研究前沿。本文研究了一种专门为增材制造开发的新型高温合金的拉伸变形行为。采用两种试样状态：构建态（直接从AM中获得）和热处理态（在870℃时效16 h）。在650℃和700℃的拉伸试验中，采用两种不同的应变速率。结果表明，热处理后合金的强度和塑性均较铸态有明显提高。此外，铸态合金表现出明显的锯齿形塑性流动，锯齿形的类型随外加应变速率的变化而变化。老化处理有效地抑制了锯齿。为了揭示其机理，对铸态和热处理合金的显微组织进行了表征和分析。锯齿形的形成归因于动态应变时效（DSA）。这项工作为定制增材制造部件的微观结构以改善性能提供了意义，从而支持增材制造高温合金的实际应用。

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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.