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

IF 1.9 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

steel research international Pub Date : 2024-09-03 DOI:10.1002/srin.202400553

Huai Zhang, Chengbin Shi, Yiwa Luo

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引用次数: 0

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

steel research international 工程技术-冶金工程

CiteScore

3.30

自引率

18.20%

发文量

319

审稿时长

1.9 months

期刊介绍： steel research international is a journal providing a forum for the publication of high-quality manuscripts in areas ranging from process metallurgy and metal forming to materials engineering as well as process control and testing. The emphasis is on steel and on materials involved in steelmaking and the processing of steel, such as refractories and slags. steel research international welcomes manuscripts describing basic scientific research as well as industrial research. The journal received a further increased, record-high Impact Factor of 1.522 (2018 Journal Impact Factor, Journal Citation Reports (Clarivate Analytics, 2019)). The journal was formerly well known as "Archiv für das Eisenhüttenwesen" and "steel research"; with effect from January 1, 2006, the former "Scandinavian Journal of Metallurgy" merged with Steel Research International. Hot Topics: -Steels for Automotive Applications -High-strength Steels -Sustainable steelmaking -Interstitially Alloyed Steels -Electromagnetic Processing of Metals -High Speed Forming