轧后冷却方式对钛微合金高强钢组织性能的影响  

The Effect of Cooling Process after Rolling on Microstructure and Properties of Titanium Micro-alloyed High Strength Steel

作　　者：徐洋[1] 李凡[1,2] 孙明雪[1] 周砚磊[1] 衣海龙[1] 刘振宇[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 [2]鞍山钢铁股份有限公司中板厂,辽宁鞍山114032

出　　处：《轧钢》2013年第6期1-3,共3页Steel Rolling

基　　金：国家自然科学基金资助项目(51104046);中央高校基本科研业务费资助项目(N120407001;N120807001);研究生科研创新项目(N110607006)

摘　　要：本文实验研究了轧后冷却方式对低碳钛微合金钢组织、析出行为以及力学性能的影响。结果表明,不同的轧后冷却方式(层流冷却、层流冷却+超快速冷却、超快速冷却)下实验钢的组织主要是细晶铁素体。与层流冷却工艺相比,采用超快速冷却工艺能够细化铁素体晶粒尺寸,促进微合金元素Ti在铁素体中的析出且细小弥散。采用超快速冷却工艺,实验钢的抗拉强度和屈服强度分别达到了760MPa和683MPa,比层流冷却工艺下实验钢分别提高了40MPa和20MPa。The effects of cooling process after rolling on microstructure , precipitation behavior and properties of titanium micro-alloyed high strength steel were researched by using the laboratory rolling test. The results show that fine grain ferrite could be obtained at laminar cooling process, laminar cooling ＋ ultra fast cooling process and ultra fast cooling process. The ultra fast cooling process could improve the grain size of ferrite, promote the finer dispersion precipitation of micro-alloying elements Ti in ferrite. The tensile strength and yield strength of strip are 760MPa and 670MPa by using the ultra fast cooling process, the yield strength and tension strength improved 25MPa and 30MPa respectively compared with laminar cooling strip.

关 键 词：超快速冷却 钛微合金高强钢 析出物 力学性能 

分 类 号：TG335[金属学及工艺—金属压力加工]