Effect of rejuvenation heat treatment on serrated flow behavior and fracture mechanism of nickel-based superalloys

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2025-05-01 DOI:10.1016/S1003-6326(25)66770-7

Jia-jian WANG , Zhe-wen HAN , Zhi-chun WANG , Bo PENG , Yue ZUO , Ju KANG

引用次数: 0

Abstract

The effects of rejuvenation heat treatment (RHT) on the serrated flow behavior and fracture mode of nickel- based superalloys (R26) were investigated by tensile tests and microstructural characterization. The serrated flow activation energies were determined to be 41−72 and 64−81 kJ/mol before and after RHT, respectively. Dynamic strain aging in the alloy is caused by the diffusion of carbon atoms into dislocation channels in the nickel matrix. Before RHT, carbides are concentrated at the grain boundaries. Cracks initiate from these carbides and propagate along the grain boundaries. RHT dissolves carbides at grain boundaries, transferring crack initiation to the precipitated phase group in the grains. RHT increases carbon atom concentration in the nickel matrix, enhancing dynamic strain aging and serrated flow behavior.

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回火热处理对镍基高温合金锯齿状流动行为及断裂机制的影响

通过拉伸试验和显微组织表征研究了回火热处理（RHT）对镍基高温合金（R26）锯齿状流动行为和断裂方式的影响。RHT前后的锯齿流活化能分别为41−72和64−81 kJ/mol。合金中的动态应变时效是由碳原子扩散到镍基体中的位错通道引起的。在RHT之前，碳化物主要集中在晶界处。裂纹由这些碳化物引发并沿晶界扩展。RHT在晶界处溶解碳化物，将裂纹萌生转移到晶粒中的析出相组。RHT提高了镍基体中的碳原子浓度，增强了动态应变时效和锯齿状流动行为。

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

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.