快速球化退火对SKS51工模具钢组织和硬度的影响  

Effect of Rapid Spheroidizing Annealing on Microstructure and Hardness of SKS51 Die Steel

作　　者：封举宁 谭峰亮 李鸿娟 曾斌[3] 汪力 叶勤政 FENG Juning;TAN Fengliang;LI Hongjuan;ZENG Bing;WANG Li;YE Qinzheng(College of Mechanical and Electrical Engineering,Hunan University of Humanities,Science and Technology,Loudi 417000,China;College of Materials and Environmental Engineering,Hunan University of Humanities,Science and Technology,Loudi 417000,China;VALIN LY Steel Co.,Ltd.,Loudi 417000,China;Guangdong Denas Metal Products Co.,Ltd.,Yunfu 527300,China)

机构地区：[1]湖南人文科技学院能源与机电工程学院,娄底417000 [2]湖南人文科技学院材料与环境工程学院,娄底417000 [3]湖南华菱涟源钢铁有限公司,娄底417000 [4]广东德纳斯金属制品有限公司,云浮527300

出　　处：《机械工程材料》2021年第8期87-90,97,共5页Materials For Mechanical Engineering

基　　金：湖南华菱涟源钢铁有限公司科研项目(201708);湖南省自然科学基金资助项目(2016JJ6045)。

摘　　要：基于离异共析原理对SKS51钢进行快速球化退火处理(包括奥氏体化和等温球化两个阶段),研究了奥氏体化温度(750,780℃)、奥氏体化保温时间(10,20 min)和等温球化温度(650,680,700℃)对显微组织和硬度的影响。结果表明:在试验条件下,升高奥氏体化温度或延长奥氏体化保温时间均会导致钢中片状碳化物增多,球化效果变差,硬度增高;经750℃×10 min奥氏体化后,随等温球化温度升高,SKS51钢中的球状碳化物含量增加,尺寸增大,硬度降低;经750℃×10 min+700℃×2 h快速球化退火后,SKS51钢中的球状碳化物最多,硬度最低。The SKS51 steel was subjected to rapid spheroidizing annealing treatment(including two stages of austenitizing and isothermal spheroidizing)based on the principle of divorced eutectoid transformation.The effects of the austenitizing temperature(750,780℃),austenitizing holding time(10,20 min)and isothermal spheroidizing temperature(650,680,700℃)on the microstructure and hardness were studied.The results show that under the test conditions,by increasing the austenitizing temperature or prolonging the austenitizing holding time,the flaky carbides in the steel increased in number,the spheroidizing effect became deteriorating,and the hardness increased.After austenitizing at 750℃for 10 min,with the increase of the isothermal spheroidizing temperature,the content and size of spherical carbides in the SKS51 steel increased,and the hardness decreased.After 750℃×10 min+700℃×2 h rapid spheroidizing annealing,the SKS51 steel had the largest number of spherical carbides and the lowest hardness.

关 键 词：SKS51工模具钢 快速球化 显微组织 离异共析 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG161[金属学及工艺—金属材料]