铌微合金钢等温及连续冷却贝氏体相变  

Bainite Transformation of Niobium Microalloyed Steel Under Isothermal and Continuous Cooling Conditions

作　　者：衣海龙[1] 杜林秀[1] 王国栋[1] 刘相华[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：《金属热处理》2006年第8期39-42,共4页Heat Treatment of Metals

基　　金：国家高技术研究发展计划项目(2003AA33G010);国家自然科学基金资助项目(50271015)

摘　　要：通过测定不同温度下等温转变的硬度曲线和不同冷却速度下连续冷却转变的膨胀曲线,结合金相组织观察,获得了含铌微合金钢的等温转变曲线和连续冷却转变曲线,研究了其等温转变和连续冷却条件下形变对贝氏体相变的影响规律。研究表明,在等温条件下,变形促进了贝氏体相变,贝氏体转变的鼻尖温度为500℃,Bs为600℃;在连续冷却条件下,随着冷却速度的增加,贝氏体转变开始温度下降,随着变形量的增加,贝氏体转变开始温度有所升高。从贝氏体转变开始温度来看,950℃变形时,对贝氏体相变有促进作用。By measuring hardness curves of isothermal transformation under different temperatures and expanding curves of continuous cooling transformation as well as the observation of microstructure, the ~ diagrams and CCT diagrams were obtained. The influence of strains on bainite transformation was researched under isothermal and continuous cooling conditions. The research results show that the bainite transformation is accelerated by strains under isothermal condition, the nose temperature of bainite transformation is 500 ℃, Bs is 600℃. The bainite starting temperature decreases with the increase of cooling rate and increases with the increase of strain under continuous cooling conditions. Bainite transformation is accelerated when deformed at 950℃ in the view of bainite starting temperature.

关 键 词：含铌微合金钢 等温转变曲线 连续冷却转变曲线 贝氏体 贝氏体转变开始温度 

分 类 号：TG111.5[金属学及工艺—物理冶金] TG142.33[金属学及工艺—金属学]