热挤压和热处理对铀-2.1%钼合金组织结构特性的影响

doi:10.13251/j.issn.0254-6051.2024.06.030

金属热处理 ›› 2024, Vol. 49 ›› Issue (6): 183-189.DOI: 10.13251/j.issn.0254-6051.2024.06.030

热挤压和热处理对铀-2.1%钼合金组织结构特性的影响

杜继军^1,2, 郭洪^1,2, 徐勇^1,3, 贺进明^1,2, 李波^1,2, 杨若楠²

1.中核新型材料研究与应用开发重点实验室, 内蒙古包头 014035;
2.中核北方核燃料元件有限公司, 内蒙古包头 014035;
3.山东建筑大学材料科学与工程学院, 山东济南 250101

收稿日期:2023-02-01 修回日期:2024-04-17 出版日期:2024-06-25 发布日期:2024-07-29
通讯作者: 郭洪,正高级工程师,博士,E-mail:simongh@163.com
作者简介:杜继军(1977—),男,高级工程师,主要研究方向为核材料核燃料,E-mail:Ke_ji_chu@163.com。

Effects of hot extrusion and heat treatment on microstructure characteristics of uranium-2.1%molybdenum alloy

Du Jijun^1,2, Guo Hong^1,2, Xu Yong¹^,3, He Jinming^1,2, Li Bo^1,2, Yang Ruonan²

1. CNNC Key Laboratory on New Materials Research and Application Development, Baotou Inner Mongolia 014035, China;
2. China North Nuclear Fuel Co., Ltd., Baotou Inner Mongolia 014035, China;
3. School of Materials Science and Engineering, Shandong Jianzhu University, Jinan Shandong 250101, China

Received:2023-02-01 Revised:2024-04-17 Online:2024-06-25 Published:2024-07-29

摘要/Abstract

摘要： 采用显微组织结构分析技术,对含钼量2.1%的铀钼合金在热挤压、扩散性退火、淬火、回火等工艺条件下的物相结构、组成和显微组织特征等进行了研究。结果表明,铀钼合金经不同的热加工工艺处理,其组织结构会有较大的变化。热挤压工艺对铀钼合金的物相组成影响不大,但对物相结构和组织特征会带来明显改变,可增加合金的硬度和强度。淬火工艺对铀钼合金的物相组成、结构和显微组织均有明显的影响,其组织结构转变为接近α相结构的α′_b单相马氏体,可造成合金的硬度和强度明显增加,但塑性和韧性将会降低。扩散性退火和回火工艺,会消除应力应变或快速相变带来的物相结构、组成和显微组织特征的影响,恢复到均匀化退火状态下的相关组织结构特性,可改善合金的塑性和韧性。

关键词: 铀钼合金, 热挤压, 热处理, 显微组织, 物相组成, 相结构

Abstract: The phase structure, composition and microstructure characteristics of uranium-molybdenum alloy with 2.1%Mo under different processing conditions such as hot extrusion, diffusion annealing, quenching and tempering were studied by using microstructure analysis techniques. The results show that the microstructure of the alloy varies greatly under different hot working processes. The hot extrusion process has little effect on the alloy phase composition but leads to obvious changes on the phase structure and microstructure characteristics, resulting in increased hardness and strength of the alloy. The quenching process causes significant changes in the alloy phase composition, structure and microstructure, transforming it into an α′_b single-phase martensitic structure close to that of the α phase, which significantly increases the alloy hardness and strength but reduces its plasticity and toughness. The diffusion annealing and tempering processes eliminate the effects of stress and strain or rapid phase transformations on the phase structure, phase composition and microstructure characteristics, restoring the relevant microstructure characteristics to a state of uniform annealing, and improving the plasticity and toughness of the alloy.

Key words: uranium-molybdenum alloy, hot extrusion, heat treatment, microstructure, phase composition, phase structure

中图分类号:

TL48

杜继军, 郭洪, 徐勇, 贺进明, 李波, 杨若楠. 热挤压和热处理对铀-2.1%钼合金组织结构特性的影响[J]. 金属热处理, 2024, 49(6): 183-189.

Du Jijun, Guo Hong, Xu Yong, He Jinming, Li Bo, Yang Ruonan. Effects of hot extrusion and heat treatment on microstructure characteristics of uranium-2.1%molybdenum alloy[J]. Heat Treatment of Metals, 2024, 49(6): 183-189.

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热挤压和热处理对铀-2.1%钼合金组织结构特性的影响

Effects of hot extrusion and heat treatment on microstructure characteristics of uranium-2.1%molybdenum alloy

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