摘要
采用MMS-300热模拟试验机研究了某含铝系TRIP钢在不同冷速下的连续冷却相变过程;结合显微组织观察,建立了试验钢在50%的压缩条件下的动态连续冷却转变曲线,分析了铁素体、贝氏体及马氏体的相变规律和组织形貌。结果表明:当冷速在5~20℃/s范围时,室温组织为铁素体、马氏体和贝氏体的复合组织,当冷速达到30℃/s后,贝氏体转变消失,室温组织全部为铁素体和马氏体;试验范围内,随着冷速的增加,生成的铁素体体积分数急剧减少,铁素体晶粒也逐渐细化,马氏体体积分数逐渐增多。试验结果为该钢种的热变形及轧后快冷工艺的制定提供了重要的理论依据。
The transformation process of a A1-TRIP steel during continuous cooling was investigated by means of MMS-300 thermal mechanical simulation at different cooling rates. Based on microstructure observation, the contin- uous cooling transformation curve（dynamic CCT curve） of experimental steel under 50% compression conditions was determined, and the phase transition regularity and microstructure of ferrite, bainite and martensite were ana- lyzed. The results show that the ferrite, bainite and martensite are obtained successively during the cooling rate be- tween 5 ℃/s and 20 ℃/s. While the cooling rate is above 30 ℃/s, the bainite transformation totally disappeared and the microstructure is made up of only ferrite and martensite. With the increase of the cooling rate, the volume fraction of the ferrite was decreased rapidly, and the ferrite grain becomes refined, and the volume fraction of the martensite was increased within the scope of the test. The experiment results can provide theoretical basis for deter- mination of the thermal deformation and accelerated cooling process parameters of this steel.
出处
《四川冶金》
CAS
2018年第1期20-23,共4页
Sichuan Metallurgy
