Microstructure regulation of INCOLOY 945 Alloy: Thermomechanical-Microstructural coupling dynamic recrystallization during hot processing

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

Materials Science and Engineering: A Pub Date : 2025-07-25 DOI:10.1016/j.msea.2025.148868

Rong Liu , Dadi Zhou , Zhihao Yao , Zihan Li , Hongying Wang , Yumeng Wu , Jianxin Dong

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引用次数: 0

Abstract

The hot deformation behavior and microstructural evolution of INCOLOY 945 alloy were systematically investigated by hot compression experiments. A comprehensive exploration was conducted into the effect of hot deformation parameters, twins, and carbides on the dynamic recrystallization (DRX) mechanism. The optimized design of thermal processing parameters was realized through the corresponding analysis of the processing map domains and typical microstructure morphology. The Research found that regional microstructural variation manifests in the alloy during hot working. The increase of temperature at high strain strengthens Secondary Dynamic Recrystallization (SDRX), which slows down the growth rate of average grain size with increasing temperature. The promotion of DRX by strain rate is attributed to the fact that high strain energy storage and the adiabatic temperature rise effect of the alloy can counteract the effect of insufficient deformation time within a certain range. This alloy exhibits multiple DRX mechanisms during thermal deformation. We analyzed microstructural evolution differences under various DRX mechanisms and the effects of deformation parameters and carbides on the DRX mechanisms. In addition, the annealing twin boundaries also shift to high-angle grain boundaries (HAGBs), thereby accelerating SDRX and refining grains. The findings provide a substantial theoretical foundation for the microstructural regulation of INCOLOY 945 superalloy during hot working, enabling optimized process design to enhance mechanical properties and service life.

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incoly 945合金的显微组织调控：热加工过程中热-组织耦合的动态再结晶

通过热压缩实验系统地研究了incoly 945合金的热变形行为和显微组织演变。全面探讨了热变形参数、孪晶和碳化物对动态再结晶（DRX）机理的影响。通过对加工图域和典型组织形貌的分析，实现了热加工参数的优化设计。研究发现，合金在热加工过程中出现了区域性的组织变化。高应变温度的升高强化了二次动态再结晶（SDRX），减缓了平均晶粒尺寸随温度升高的增长速度。应变速率对DRX的促进作用是由于合金的高应变蓄能和绝热温升效应可以在一定范围内抵消变形时间不足的影响。该合金在热变形过程中表现出多种DRX机制。分析了不同DRX机制下的显微组织演化差异，以及变形参数和碳化物对DRX机制的影响。此外，退火孪晶界也向高角度晶界（HAGBs）转变，从而加速了SDRX和细化晶粒。研究结果为incoly 945高温合金在热加工过程中的组织调控提供了坚实的理论基础，为优化工艺设计提高机械性能和使用寿命提供了依据。

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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.