4Cr16Mo钢和4Cr16MoN钢的相变与组织特征  

Characteristics of Phase Transformation in 4Cr16Mo Steel and 4Cr16MoN Steel

作　　者：袁森[1] 吴晓春[1] 庄郁健[1] 张洪奎[2] 罗毅[1] 

机构地区：[1]上海大学材料科学与工程学院材料加工系,上海200072 [2]宝钢股份特殊钢分公司,上海200940

出　　处：《物理测试》2011年第3期1-4,共4页Physics Examination and Testing

基　　金："十一五"国家科技支撑计划课题(2007BAE51B04);上海市重点学科建设项目资助(S30107)

摘　　要：4Cr16 MoN钢是一种新型钢种,它的平衡相图和CCT曲线可以为试验钢的大生产和热处理提供依据,为了和4Cr16 Mo钢进行对比,通过J-Matpro模拟软件计算4Cr16 MoN和4Cr16 Mo钢的平衡相图,再利用DIL805A热膨胀相变仪测定其CCT曲线,试验条件是1 050℃奥氏体化,保温5 min,按照10、3、1.2、1、0.5、0.1、0.08、0.05、0.03℃/S等不同冷速冷却。试验结果表明:在两种试验钢计算的平衡相图中,高温区很宽的温度范围内保持单相奥氏体,未出现δ铁素体相;两种试验钢CCT曲线都有独立的珠光体和贝氏体转变区域,4Cr16 MoN钢的P临界冷速和B临界冷速分别是0.1℃/s和1.2℃/s,而4Cr16 Mo钢的P临界冷速和B临界冷速分别小于0.03℃/s和3℃/s。The large-scale production and heat treatment of 4Cr16MoN steel are provided by the equilibrium phase diagram and CCT curve of steel.The equilibrium phase diagram of 4Cr16MoN and 4Cr16Mo steel are calculated By J-Matpro simulation software.Then the CCT curves are measured by DIL805A phase change thermal expansion.Here are the test conditions：1 050 ℃/s austenite,holding 5 min,cooling based on 10、3、1.2、1、0.5、0.1、0.08、0.05、0.03 ℃/s.The results showed that： in calculated equilibrium phase diagram of the two test steels,over a wide high temperature range the steel was maintained to be single-phase austenite,not δ ferrite;Two experimental CCT curves of the steels have independent pearlite and bainite regions;The critical cooling rate of P and B of 4Cr16MoN steel is 0.1 ℃/s and 1.2 ℃/s respectively,while the critical cooling rate of P and B of 4Cr16Mo steel is less than 0.03 ℃/s and 3 ℃/s.

关 键 词：含氮塑料模具钢 J-Matpro模拟软件 CCT曲线 

分 类 号：TG142.1[一般工业技术—材料科学与工程]