双退火过程中再加热速度对C-Mn-Si-Al钢组织演变的影响  

Influence of Reheating Rate on Microstructure Evolution of C-Mn-Si-Al Steel during Double Annealing

作　　者：肖洋洋[1] 冷德平 崔磊[1] 彭飞 XIAO Yangyang;LENG Deping;CUI Lei;PENG Fei(Technology Center of Ma'anshan Iron and Steel Company,Ma'anshan 243003,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243003 [2]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：《热加工工艺》2025年第2期72-75,共4页Hot Working Technology

摘　　要：以Nb/Ti微合金化C-Mn-Si-Al钢为研究对象,研究了双退火过程中再加热速率对组织演变过程的影响。结果表明,马氏体基体再加热过程中发生回火析出渗碳体,随着再加热速率的增加,渗碳体析出区间逐渐增大,但析出量逐渐减小,到再加热速率为80℃/s时,基本不析出渗碳体。最终组织均为板条马氏体,其中部分板条马氏体存在自回火析出的碳化物。此外,存在两种不同形态和尺寸的夹杂物,一种是由TiN和Al2O3组成的块状复合夹杂,另一种是由Nb单质为主体微溶Ti的长方形夹杂。The influence of reheating rate on the microstructure evolution of C-Mn-Si-Al steel microalloyed with Nb and Ti was investigated.The results show that the martensite matrix is tempered to precipitate cementite during the reheating process.With increasing reheating rate,the precipitation interval of cementite increases gradually,but the precipitation decreases gradually.When the reheating rate is 80℃/s,no cementite is precipitated.The final microstructure is mainly composed of martensite,which is partially self-tempered to precipitate carbide during the quenching process.Moreover,two different inclusions with significant discrepancy in size and morphology are observed,one is block inclusion combined with TiN and Al2O3,the other is rectangle inclusion Ti with Nb simple substance as main body.

关 键 词：双退火 马氏体 渗碳体 再加热速度 

分 类 号：TG156.21[金属学及工艺—热处理]