Effect of Nb and La on Precipitates, Yield Strength and Toughness of FeCrAl Alloy

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-09-04 DOI:10.1002/srin.202400553

Huai Zhang, Chengbin Shi, Yiwa Luo

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Abstract

FeCrAl alloy is considered a promising material for light water reactor fuel cladding due to its excellent elevated temperature oxidation resistance and radiation performance. The effects of 0.21 wt% Nb or 0.23 wt% La additions on the microstructure, second phase, yield strength and toughness of FeCrAl alloy are studied. The morphology and number fraction of inclusions in FeCrAl alloys are analyzed. The addition of 0.21 wt% Nb in FeCrAl alloy promotes the precipitation of nanoscale (Fe,Cr)2(Nb,Ti) Laves phase and refining grain size. The addition of La‐modified Al2O3 and MgO·Al2O3 inclusions to La2O3 and LaS, and La2O3 is favorable to promote the heterogeneous nucleation of α‐Fe. The fracture mode of the FeCrAl alloy with 0.21 wt% Nb or 0.23 wt% La transitions from dimple fracture and quasi‐cleavage fracture to dimple fracture, in comparison with Nb‐free or La‐free FeCrAl alloy. Nb and La additions improve the yield strength and toughness of FeCrAl alloy. The addition of Nb exhibits a more pronounced strengthening effect on FeCrAl alloy compared with the addition of La.

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Nb 和 La 对 FeCrAl 合金析出物、屈服强度和韧性的影响

由于具有优异的高温抗氧化性和辐射性能，FeCrAl 合金被认为是一种很有前途的轻水反应堆燃料包壳材料。本文研究了添加 0.21 wt% Nb 或 0.23 wt% La 对 FeCrAl 合金微观结构、第二相、屈服强度和韧性的影响。分析了 FeCrAl 合金中夹杂物的形态和数量分数。在 FeCrAl 合金中添加 0.21 wt% 的 Nb 可促进纳米级 (Fe,Cr)2(Nb,Ti) Laves 相的析出并细化晶粒尺寸。在 La2O3 和 LaS 中加入 La 改性 Al2O3 和 MgO-Al2O3 包裹体，La2O3 有利于促进 α-Fe 的异质成核。与不含 Nb 或 La 的 FeCrAl 合金相比，含 0.21 wt% Nb 或 0.23 wt% La 的 FeCrAl 合金的断裂模式从凹陷断裂和准劈裂断裂转变为凹陷断裂。添加 Nb 和 La 可提高铁铬铝合金的屈服强度和韧性。与添加 La 相比，添加 Nb 对 FeCrAl 合金的强化效果更为明显。

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.

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