初始组织对低合金调质高强钢热处理后力学性能的影响  

Effect of Initial Microstructure on Final Mechanical Properties of Quenched and Tempered High Strength Steel Plates

作　　者：卢峰[1] 康健[2] 王超[2] 邓想涛[2] 王昭东[2] 王国栋[2] 

机构地区：[1]河北钢铁集团唐山钢铁公司宽厚板项目经理部,河北唐山063000 [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110004

出　　处：《轧钢》2011年第1期11-14,共4页Steel Rolling

基　　金：中央高校基本科研业务费资助项目(N090607001);国家科技支撑计划项目(2006BAE03A08)

摘　　要：本文以开发屈服强度为960MPa级工程机械用调质高强钢为目的,分析了不同的轧制及轧后冷却工艺对实验钢热处理后力学性能的影响。结果表明,不同的轧制及轧后冷却工艺决定了实验钢热处理前的初始显微组织,进而影响其热处理后的力学性能。实验钢经控制轧制并层冷至600℃后空冷,得到的初始组织为粒状贝氏体及少量的马氏体,其中M/A组元更多地呈条状分布在基体上;经调质处理后,实验钢获得了较高的强韧性,R_(eL)为1033MPa,R_m为1053MPa,A_(kv)(-40℃)达173J,各项指标均达到相关标准要求。In order to develop 960MPa in yield strength steel plates for engineering machinery by quenching and tempering technology,the effects of rolling and cooling on microstructure and mechanical properties after heat treatment were investigated.The results showed that initial structure before quenched and tempered processes was determined by various rolling and cooling modes.And then the final mechanical properties after heat treatment were influenced by initial microstructure.When controlled rolling and controlled cooling process was performed, the initial microstructure composed of granular bainite and a few martensite phases could be obtained. And the dispersed M/A constituent distributing in the matrix showed mainly stripy feature.In this case,the experimental steel after heat treatment could achieve optimum mechanical properties,the yield strength is 1033MPa,the tensile strength is 1053MPa and the Charpy impact energy at -40℃could reach 173J.All indexes could meet the requirement of national standard.

关 键 词：高强钢 轧制工艺 控制冷却 显微组织 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG335.5[金属学及工艺—金属材料]