温轧原始组织及冷却速率对低碳微合金钢终态组织的影响  

Effects of Cooling Rate and Original Microstructure on Final Microstructure of Low-carbon and Micro-alloyed Steels

作　　者：姚圣杰[1] 杜林秀[1] 刘相华[1] 王国栋[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110004

出　　处：《机械工程材料》2008年第11期16-19,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(50527402)

摘　　要：为了研究温轧原始组织及冷却速率对材料终态组织的影响,利用两种低碳微合金钢在不施加变形的前提下结合快速加热及冷却工艺,对不同条件下的终态组织进行了比较。结果表明:合金元素含量较高的钢中,温轧组织不同对终态组织的影响比较显著,其中以原始组织为温轧回火马氏体的更能有效获得细化和多相的终态组织;随着冷却速率的增加,铁素体平均晶粒尺寸减小,且在合金元素含量较高的钢中,更容易获得贝氏体和马氏体组织,而合金元素含量较低的钢中,冷却速率对终态组织的影响不大。In order to investigate the effects of original warm-rolled microstructure and cooling rate on the final microstructure, a rapid heating and cooling process without pre-deforamtion were utilized in two different lowcarbon steels, and a comparison about the final microstrueture of different samples was employed. The results indicate that more significant effect of the warm-rolled microstrueture on the final microstrueture was obtained in the steel with more alloying elements. Better refinement effect and muhiphase could be more easily evolved from the original warm-rolled tempered martensite. The average ferrite grain size decreased with the increase of cooling rate. Besides, bainite and martensite preferentially formed in the steel with higher content of alloying elements. The final microstructure was less sensitive to cooling rate in the steel with lower content of alloying elements.

关 键 词：原始组织 冷却速率 马氏体 贝氏体 

分 类 号：TG113.2[金属学及工艺—物理冶金]