摘要
研究了6Cr21Mn10MoVNbN气阀钢在1 000℃到1 250℃固溶处理时的晶粒长大规律,并分析了等温固溶时晶粒长大的动力学.结果表明,弥散分布的碳氮化物对晶粒长大有显著阻碍作用,在低于该钢的晶粒粗化温度（1150℃）固溶处理时,大量未溶解的碳氮化物使得晶粒尺寸增幅较小、洛氏硬度小幅下降;在高于1150℃时,随温度的升高或时间延长,晶粒长大迅速,洛氏硬度大幅下降;晶粒生长指数随固溶温度的升高而呈台阶式增长;在固溶温度为1 050～1100℃下的晶粒长大激活能为189.9 kJ/mol,晶粒长大机理为自扩散过程控制机理,并建立了相应的晶粒长大动力学方程.
Grain growth and its kinetics during solid solution treatment of 6Cr21Mn10MoVNbN steel in a temperature range from 1000 ℃ to 1250 ℃ were investigated. The experimental results show that the dispersed carbonitride in the steel greatly restrains grain growth. The grain size is increa seda little and Rockwell hardness is decreased a little by solid solution treatment at the temperature below grain coarsening temperature（1 150 ℃） due to undissolved carbo-nitride, but grain grow rapidly and Rockwell hardness decreases quickly by solid solution at 1 150 ℃. Grain growth increases exponently with the increasing solid solution treatment temperature. At the temperature from 1 050 ℃ to 1 100 ℃, the activation energy value for grain growth is 189.9 kJ/mol, which means that the grain growth mechanism is self-diffusion controlling process, and the grain growth kinetics equation is given.
出处
《钢铁》
CAS
CSCD
北大核心
2006年第6期71-76,共6页
Iron and Steel
基金
2003国家火炬计划项目(2003EB030408)
