一种Mn-Al系TRIP钢的临界区奥氏体稳定化研究  

Intercritical Austenite Stabilization of a Mn-Al TRIP Steel

作　　者：胡智评 许云波[1] 谭小东[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2016年第2期179-183,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51174059;51404155;U1260204);国家重点基础研究发展计划项目(2011CB606306);中央高校基本科研业务费专项资金资助项目(N130407003);新世纪优秀人才支持计划项目(NCET-13-0111);辽宁省高等学校优秀人才支持计划项目(LR2014007)

摘　　要：利用实验室MMS-200热模拟试验机对Fe-0.2C-7Mn-3Al钢的临界区奥氏体稳定化行为进行研究.通过SEM,EPMA,TEM和XRD等手段观察并分析了实验钢的微观组织演变以及C和Mn元素的配分过程.实验结果表明,不同的临界区退火温度下,实验钢中均存在25%~30%左右的粗大压扁状δ铁素体.随着退火温度的升高,微观组织中残余奥氏体的含量先增加后减小,体积分数为10.2%~32.5%,残余奥氏体与临界区铁素体呈板条状相间分布,板条宽度约200~300 nm.最佳的临界区退火温度为750℃.C,Mn,Al元素的协同作用促进了临界区奥氏体的稳定化,使得实验钢能够在较短的时间内完成有效的配分.The intercritical austenite stabilization of Fe-0. 2C-7Mn-3Al steel was investigated by MMS-200 thermo-mechanical test machine in the lab. The microstructure evolution and the partitioning process of C,Mn were characterized and analyzed by using SEM,EPMA,TEMand XRD. The results showthat there are always 25%- 30% bulky flattened ferrite at different intercritical annealing temperatures. As the intercritical annealing temperature increases, the retained austenite content in the microstructure increases first and then decreases,with the volume fraction being 10. 2%- 32. 5%. The retained austenite and the intercritical ferrite are located with the lath shape,and the lath width is 200- 300 nm. The optimized annealing temperature is750 ℃. The synergistic effect of C,Mn and Al promotes the austenite stabilization during intercritical annealing,which causes the partitioning process with less time of the tested steel.

关 键 词：Mn-Al系TRIP钢 奥氏体稳定化 奥氏体逆相变 组织演变 残余奥氏体 

分 类 号：TG113.12[金属学及工艺—物理冶金]