热变形后冷却速率对钒氮非调质钢显微组织的影响  

Effect of Cooling Rates after Hot Deformation on Microstructure of Vanadium-nitrogen Non-quenched and Tempered Steel

作　　者：刘宏玉[1] 刘建华 李海波[1] 陈小龙 黄刚[1] 唐历 

机构地区：[1]武汉科技大学理学院,武汉430081 [2]攀枝花新钢钒股份有限公司,攀枝花617062

出　　处：《机械工程材料》2009年第8期7-9,共3页Materials For Mechanical Engineering

摘　　要：利用光学显微镜、扫描电镜和透射电镜观察了钒氮非调质钢在Gleeble1500热模拟试验机上经奥氏体区热变形后以四种冷却速率冷却到室温的显微组织,并用JMatPro4.1软件计算了冷却后的组织构成及力学性能。结果表明:随着冷却速率增加,组织中铁素体变细且数量减少,珠光体增多,而且贝氏体数量逐渐增加并出现马氏体;钒、钛析出物的形状由规则形状向粒状转化,尺寸变小,以(Ti,V)N为主逐渐转变为以(Ti,V)C为主;不同冷却速率下平衡相组成的计算结果与实际组织基本一致;以3.0℃.s-1冷却后,试验钢室温屈服强度的计算结果为(814±42)MPa。The microstructure of vanadium-nitrogen steel was observed by using optical microscopy, scanning electron microscopy and transmission electron microscopy after hot deformation of austenite and cooling to room temperature at four different cooling rates on thermal simulation tester Gleeble 1500. Structural constitution and mechanical properties were calculated via JMatPro4. 1 software. The results show that the ferrite refined and its amount decreased, the pearlite content increased the amount of bainite increased gradually and martensite appeared with the continuous increasing of cooling rate. The morphology of vanadium and titanium precipitates changed from regular to granular and from （Ti, V）N to （Ti, V）C, the size was also refined. The calculation equilibrium phase constitution results from the software was similar to that of real samples. The yield stress at room temperature was （814±42） MPa at the cooling rate of 3.0℃·s^-1.

关 键 词：钒氮非调质钢 冷却速率 显微组织 析出物 

分 类 号：TG142.1[一般工业技术—材料科学与工程]