Hot Deformation Behavior and Workability of a New Ni–W–Cr Superalloy for Molten Salt Reactors

IF 2.9 2区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Long Liu, Zijian Zhou, Jie Yu, Xinguang Wang, Chuanyong Cui, Rui Zhang, Yizhou Zhou, Xiaofeng Sun
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引用次数: 0

Abstract

The hot deformation behavior of a newly developed Ni–W–Cr superalloy for use in 800 °C molten salt reactors (MSRs) was looked into by isothermal compression tests in the temperature range of 1050–1200 °C with a strain rate of 0.001–1 s−1 under a true strain of 0.693. An Arrhenius-type model for the Ni–W–Cr superalloy was constructed by fitting the corrected flow stress data. In this model, the effect of dispersion of solid solution elements during thermal deformation on microstructure evolution was considered, as well as the effects of friction and adiabatic heating on the temperature and strain rate-dependent variation of flow stresses. The hot deformation activation energy of the Ni–W–Cr superalloy was 323 kJ/mol, which was less than that of the Hastelloy N alloy (currently used in MSRs). According to the rectified flow stress data, processing maps were created. In conjunction with the corresponding deformation microstructures, the flow instability domains of the Ni–W–Cr superalloy were determined to be 1050–1160 °C/0.03–1 s−1 and 1170–1200 °C/0.001–0.09 s−1. In these deformation conditions, a locally inhomogeneous microstructure was caused by flow—i.e., incomplete dynamic recrystallization and hot working parameters should avoid sliding into these domains. The ideal processing hot deformation domain for the Ni–W–Cr superalloy was determined to be 1170–1200 °C/0.6–1 s−1.

熔盐反应堆用新型 Ni-W-Cr 超合金的热变形行为和可加工性
通过在 1050-1200 °C 温度范围内以 0.001-1 s-1 的应变速率和 0.693 的真实应变进行等温压缩试验,研究了一种新开发的用于 800 °C 熔盐反应器 (MSR) 的 Ni-W-Cr 超级合金的热变形行为。通过拟合修正后的流动应力数据,构建了 Ni-W-Cr 超合金的阿伦尼乌斯模型。在该模型中,考虑了热变形过程中固溶元素的分散对微观结构演变的影响,以及摩擦和绝热加热对随温度和应变速率变化的流动应力的影响。Ni-W-Cr 超合金的热变形活化能为 323 kJ/mol,低于哈氏合金 N(目前用于 MSR)。根据整流应力数据,绘制了加工图。结合相应的变形微观结构,Ni-W-Cr 超合金的流动不稳定域被确定为 1050-1160 °C/0.03-1 s-1 和 1170-1200 °C/0.001-0.09 s-1。在这些变形条件下,局部不均匀的微观结构是由流动(即不完全的动态再结晶)引起的,热加工参数应避免滑入这些区域。Ni-W-Cr 超合金的理想加工热变形域被确定为 1170-1200 °C/0.6-1 s-1。
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来源期刊
Acta Metallurgica Sinica-English Letters
Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
6.60
自引率
14.30%
发文量
122
审稿时长
2 months
期刊介绍: This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.
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