Mn18Cr18N护环钢多火次热锻过程中晶粒的长大规律  

Grain Growth Behavior of Mn18Cr18N Retaining Ring Steel during Multi-heating Hot Forging Process

作　　者：何文武[1] 刘建生[1] 郭银芳[1] 陈慧琴[1] 郭会光[1] 

机构地区：[1]太原科技大学材料科学与工程学院,太原030024

出　　处：《机械工程材料》2010年第7期20-22,61,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(50675146);国家"十一五"科学支撑计划资助项目(2007BAF02B07)

摘　　要：针对Mn18Cr18N钢护环锻件多火次锻造后晶粒易长大的问题,研究了不同加热条件对其晶粒尺寸的影响,同时进行了二火次小试样锻造验证。结果表明:锻件的晶粒尺寸具有一定的遗传性,当再加热温度为1 100℃、保温5 h以内,或者在1 050℃长时间再加热的情况下,均未发生晶粒明显长大现象;该钢晶粒长大模型为D_t^(5.9)—D_0^(5.9)=2.2×10^(26)exp(-486809/RT)·t。In order to solve the problem of grain growth for the Mn18Cr18N retaining ring steel during the multi-heating hot forging process, the effect of heating condition on grain size was investigated. The two-heating forging test had also been verified with small samples. The results show that the grain size of forgings bad a certain hereditary, and the grain size didn＇t dramatically grow when the forging reheated at 1 100 ℃ for less than 5 h or 1 050 ℃ for longer time. And the grain growth mode of the steel was

关 键 词：Mn18Cr18N钢 晶粒长大 多火次 护环 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG156.1[金属学及工艺—金属材料]