冷却速率及杂质元素对锆合金β→α转变组织的影响  

Effect of Cooling Rates and Impurities on the Microstructure of β→α Transformation in Zr Alloys

作　　者：栾佰峰[1] 薛姣姣[1] 柴林江[1] 周军[2] 

机构地区：[1]重庆大学,重庆400044 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2013年第12期2636-2640,共5页Rare Metal Materials and Engineering

基　　金：教育部新世纪优秀人才支持计划(NCET-08-0606);中央高校基本科研业务费专项资金(CDJXS10132201);重庆大学大学生科研训练计划(CQU-SRTP-2011354);重庆大学大型仪器设备开放基金(2011121507)

摘　　要：锆合金β相冷却组织对于发展高性能燃料包壳具有至关重要的作用。本工作从冷却速率和杂质元素两个影响因素出发,对核反应堆用锆合金β→α转变组织的相关研究进行了综述。锆合金的马氏体转变为无扩散的切变过程,不产生表面浮凸,Ms不随冷却速率变化。成分相同时,随着β冷却速率的增加,锆合金微观结构按如下次序变化:Lenticular组织→Parallel-plate魏氏组织→Basketweave魏氏组织→马氏体。相同冷却速率下,当杂质元素参与形成难溶的第二相时,会促进Basketweave组织的形成,而当这些元素提高β转变温度时,则倾向于促进Parallel-plate组织的形成。This paper presents a comprehensive review about the effect of cooling rates and impurities on the microstructure of zirconium alloys during β→α transformation with the expectation to facilitate the development of high-performance zirconium-based cladding materials. For zirconium alloys, the diffusionless Martensitic transformation does not produce a surface rumpling after quenching the pre-polished specimens. The Ms temperature keeps independent of β quenching rates. When alloy composition is fixed, increasing of cooling rate causes microstructural change in the following sequence： lenticular a→Parallel plate a→Basketweave a→Martensitic a＇. The impurities which can form insoluble second phase particles in β phase will promote the formation of Basketweave Widmanstatten structures. However, the impurities that might increase fl phase transformation temperature will lead to more Parallel-plate Widmanstatten structures.

关 键 词：锆合金 冷却速率 马氏体 魏氏组织 杂质元素 

分 类 号：TG146.414[一般工业技术—材料科学与工程]