热处理和铌含量对铀铌合金显微组织与相结构的影响  

Effect of Heat Treatment and Niobium Content on Microstructure and Phase Structure of Uranium-niobium Alloy

作　　者：唐县娥[1] 陈向林[1] 张丽[1] 王勤国[1] 陆超 徐云生[1] TANG Xian’e;CHEN Xianglin;ZHANG Li;WANG Qinguo;LU Chao;XU Yunsheng(China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院,绵阳621900

出　　处：《理化检验（物理分册）》2019年第12期824-829,共6页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：中国工程物理研究院资助项目(QS/QC-2018-32).

摘　　要：铀铌合金的显微组织和相结构与铌含量和热处理制度密切相关。通过定量金相法对不同热处理制度下铀铌合金的显微组织和相结构演化进行了表征和分析。结果表明:淬火铀铌合金为单相过饱和固溶体,随铌含量增加,其相结构变化依次为正交、单斜、四方结构,显微组织形貌变化依次为针状、板条、等轴晶粒;慢冷铀铌合金为富铌(γ1-2)和贫铌(α′)片层交替组成的珠光体;马氏体组织退火时优先沿奥氏体晶界发生胞状分解,分解组织也为富铌和贫铌片层交替组成的珠光体,分解动力学符合JMAK方程。Microstructure and phase structure of uranium-niobium alloys are closely related to the niobium content and heat treatment process. The microstructure and phase structure evolution of uranium-niobium alloys under different heat treatment conditions were characterized and analyzed by quantitative metallography. The results show that quenched uranium-niobium alloy was single-phase supersaturated solid solution, and the phase structure transformed from the orthogonal to monoclinic and tetragonal structure with the increase of niobium content, the microstructure changed in the acicular, lath and equiaxed grains sequence. Slow-cooled uranium-niobium alloy was pearlite composed of niobium-rich(γ1-2) and niobium-poor(α′) alternating lamellae. Cellular decomposition occurred preferentially along austenite boundaries during the annealing in martensitic structure, and the decomposed structure was pearlite composed of niobium-rich and niobium-poor lamellae as well. The decomposition kinetics can be well described by the JMAK equation.

关 键 词：铀铌合金 热处理 显微组织 相结构 

分 类 号：TG156[金属学及工艺—热处理] TG146.8[金属学及工艺—金属学]