The Effect of Niobium Addition on the Microstructure and Tensile Properties of Iron-Nickel Base A286 Superalloy

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-03-10 DOI:10.22068/IJMSE.18.1.7

Reza Soleimani Gilakjani, S. Razavi, M. Seifollahi

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引用次数: 2

Abstract

Niobium is a significant addition to superalloys to enhance high-temperature mechanical properties. The purpose of this study is twofold: (1) to investigate the η and γ/ phase precipitations along with (2) to identify the high-temperature tensile properties in A286 and Nb-A286, as a modified type. The heat treatment of both alloys was carried out in a two-stage aging procedure at 760 °C for 16 h and 820 °C for 2 to 30 hours, then characterized by optical and scanning electron (SEM-EDS) microscopies, differential thermal analysis (DTA), and high-temperature tensile tests. The results showed that niobium addition increased the volume fraction of γ/ phase, from 10.7 % to 12 %, decreased its size, from 94 to 71 nm, and intensified the γ/-dissolution temperature from 987 °C to 1007 °C. Moreover, the γ/ to η phase transformation was sluggishly occurred in Nb-A286 due to the higher stability of γ/ precipitations. Furthermore, the Nb-A286 alloy demonstrates higher mechanical properties than the A286 one, approximately 100 MPa improvement, which was contributed to the much larger volume fraction and finer size of more stabilized γ/ phase.

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添加铌对铁镍基A286高温合金组织和拉伸性能的影响

铌是提高高温机械性能的重要添加剂。本研究的目的有两个:(1)研究η相和γ相的析出;(2)确定A286和改性的Nb-A286的高温拉伸性能。对两种合金进行了760°C 16 h和820°C 2 ~ 30 h的两阶段时效处理，然后通过光学和扫描电子(SEM-EDS)显微镜、差热分析(DTA)和高温拉伸测试进行了表征。结果表明，铌的加入使γ/相的体积分数从10.7%提高到12%，使γ/相的尺寸从94 nm减小到71 nm，并使γ/相的溶解温度从987℃提高到1007℃。由于γ/析出相的稳定性较高，Nb-A286的γ/向η相变发生缓慢。此外，Nb-A286合金的力学性能比A286合金提高了约100 MPa，这是由于其体积分数更大，尺寸更细，γ/相更稳定。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.