NbC TRANSFORMATION DURING AGING IN HP40-Nb HEAT RESISTANT ALLOY

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-09-24 DOI:10.36547/ams.28.3.1562

M. H. Sosa Lissarrague, C. Lanz

引用次数: 0

Abstract

In this work, the evolution of MC-type Nb-rich primary carbides in a 35Ni-25Cr-Nb-type refractory alloy, commonly known as HP40-Nb, and its transformation into Ni-Nb silicide known as G-phase (Ni16Nb6Si7), has been studied. For this purpose, the experimental technique of scanning electron microscopy was used together with X-ray microanalysis to detect changes in the chemical composition of niobium carbide over time and at a given aging temperature. The microstructure of the studied alloy, in its as-cast condition, consists of an austenitic matrix strengthened by a network of primary eutectic-like carbides rich in chromium and niobium of the M23C6 and MC types, respectively. During aging of the alloy at high temperatures, microstructural changes take place such as the secondary precipitation of M23C6 type carbides and the transformation of the primary Nb-rich carbide towards the Ni-Nb-rich silicide. It has been found that the transformation begins at the interface of the niobium carbides with the matrix, progressing towards their interior with the development of aging.

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HP40-Nb耐热合金时效过程中的NbC相变

在这项工作中，研究了35Ni-25Cr-Nb型难熔合金（通常称为HP40Nb）中MC型富Nb初生碳化物的演变，以及其转变为被称为G相的Ni-Nb硅化物（Ni16Nb6Si7）。为此，将扫描电子显微镜的实验技术与X射线显微分析结合起来，检测碳化铌的化学成分在给定老化温度下随时间的变化。所研究合金在铸态条件下的微观结构由奥氏体基体组成，该基体由分别富含M23C6和MC型铬和铌的初生共晶状碳化物网络增强。在合金在高温下时效期间，发生微观结构变化，例如M23C6型碳化物的二次沉淀和初级富Nb碳化物向富Ni Nb硅化物的转变。研究发现，转变开始于铌碳化物与基体的界面，随着时效的发展向内部发展。

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.