FeCrAl不锈钢包壳管挤压及退火工艺优化  

Optimization of extrusion and annealing processes for FeCrAl stainless steel cladding pipes

作　　者：潘钱付[1] 赵勇 张毅勇[1] 郑继云 刘超红[1] 王玉容 蒋明忠[1] Pan Qianfu;Zhao Yong;Zhang Yiyong;Zheng Jiyun;Liu Chaohong;Wang Yurong;Jiang Mingzhong(Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu Sichuan 610213,China)

机构地区：[1]中国核动力研究设计院反应堆燃料及材料重点实验室,四川成都610213

出　　处：《金属热处理》2020年第3期220-225,共6页Heat Treatment of Metals

摘　　要：利用光学显微镜、扫描电镜、电子背散射衍射和万能拉伸试验机等对FeCrAl合金包壳管挤压前后的微观组织、析出相及退火后的微观组织、析出相、再结晶及力学性能进行了研究。结果表明:Nb含量对FeCrAl合金中第二相的析出影响显著,高Nb含量下Laves相的析出温度和析出数量均大大提高;降低挤压温度有助于Fe Cr Al合金管坯中形成细小弥散第二相;随着退火温度升高,细小弥散相的析出数量呈现先增多后减少的趋势;在相同退火工艺下,800℃热挤压管坯的室温力学性能比950℃热挤压管坯的室温力学性能要更加优异。Microstructure and precipitates of the FeCrAl stainless steel before and after extrusion were investigated,the microstructure,precipitates,recrystallization and mechanical properties of it after annealing process were also investigated by using optical microscope(OM),scanning electron microscope(SEM),electron backscattered diffraction(EBSD)and universal tensile testing machine.The results show that the Nb content has a significant impact on the precipitation of secondary phases,especially,the precipitation temperature and amount of the Laves phase both increases under the high Nb content.Decreasing the extrusion temperature has contributed to the formation of fine dispersed second phases of Fe Cr Al stainless steel cladding pipes.With the increase of annealing temperature,the precipitation quantity of fine dispersed phases increases first and then decreases.Under the same annealing process,the room temperature mechanical properties of800℃extruded tubes are better than those of 950℃extruded tubes.

关 键 词：FeCrAl合金 LAVES相 力学性能 

分 类 号：TG376.9[金属学及工艺—金属压力加工]