800 MPa级超级钢变形后连续冷却过程的组织变化  

Transformation of microstructure of 800MPa grade HSLA steel during the continuous cooling

作　　者：漆世泽[1] 陆匠心[2] 苏连锋[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 [2]上海宝钢集团公司,上海200941

出　　处：《轧钢》2003年第1期4-7,共4页Steel Rolling

基　　金：国家973新一代钢铁材料重大基础研究项目(G1998061509)

摘　　要：利用热模拟试验机研究了一种屈服强度达800MPa的高强度低合金钢在连续冷却工艺条件下的组织变化情况。并利用热膨胀法建立了静态和动态条件下的连续冷却转变曲线,分析了冷却速度对组织和性能的影响。研究表明,在较宽冷却速度范围内(5～20℃/s)都能有贝氏体组织生成;变形温度对中温贝氏体转变和贝氏体显微硬度值的影响很小。Utilize hot simulation experiment machine to carry on experiment study about the transformation of microstructure of HSLA steel,which yield stress is at least 800MPa,during the continuous cooling conditionsWe have obtained the continuous cooling transformation curves under deformed and undeformed conditions through thermal dilation method,and analyzed the influence of the cooling rate on the microstructure and mechanical propertiesThe results show that bainite can be formed during a large cooling rates scale from 5 to 20 centigrade per secondThe influence of the deformation temperature on the microhardness of bainite and the transformation of bainite that forms at moderate temperature is slight

关 键 词：连续冷却转变曲线 高强度低合金钢 屈服强度 热膨胀法 

分 类 号：TG142[一般工业技术—材料科学与工程]