三维原子探针表征10Ni3MnCuAl钢时效过程中析出相NiAl和Cu的变化规律  

Characterization of Precipitates NiAl and Cu in 10Ni3MnCuAl Steel During Aging by Three-dimensional Atomic Probe

作　　者：韩永强 王宇斌 陈旋 吴晓春[1,2] HAN Yongqiang;WANG Yubin;CHEN Xuan;WU Xiaochun(State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200072;School of Materials Science and Engineering,Shanghai University,Shanghai 200072)

机构地区：[1]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海20007 [2]2上海大学材料科学与工程学院,上海200072

出　　处：《材料导报》2019年第24期4136-4140,共5页Materials Reports

基　　金：国家重点研发计划项目(2016YFB0300400; 2016YFB0300402)~~

摘　　要：本研究使用三维原子探针表征了10Ni3MnCuAl钢在540℃时效过程中析出相随时间的变化规律,使用透射电镜分析了NiAl析出相的晶体结构及其在基体上的分布状态。结果表明:10Ni3MnCuAl钢在540℃时效过程中,NiAl析出相由时效2h后的近球状转变为时效100h后的长条状,平均粒子半径由1.13nm长大到2.13nm,数量密度由1.70×10^22m^-3降低到3.40×10^21m^-3;Cu析出相由时效2h后的球状转变为时效100h后的长条状,平均粒子半径由1.04nm长大到2.08nm,数量密度由6.04×10^21m^-3降低到2.00×10^21m-3。两种析出相由相邻位置转变为以Cu为核心,NiAl为外壳的壳状结构。B2结构的NiAl相对基体的强化作用大于Cu相对基体的强化作用,NiAl相弥散分布在马氏体板条上,并在基体的[200]方向存在超结构反射斑点。In this paper,we analyzed the variation rule of precipitates with time in 10Ni3MnCuAl steel during aging at 540 ℃ by three-dimensional atom probe (3DAP) and studied the crystal structure of the NiAl precipitates and their distribution on the martensite by TEM. The results show: the mean volume-equivalent radius of B2-NiAl precipitates increases from 1.13 nm to 2.13 nm,while the number density decreases from 1.70×10^22 m^-3 at 2 h to 3.40×10^21 m^-3 at 100 h. The mean volume-equivalent radius of these Cu precipitates increases from 1.04 nm to 2.08 nm,and the number density decreases from 6.04×10 ^21 m ^-3 at 2 h to 2.00×10^ 21 m^-3 at 100 h. As time changes,the shapes of them are changed from sphe- rical to long strips,B2-NiAl precipitates are dispersed on the martensite lath which play a major role in the strengthening of the matrix. There are superlattice in crystal orientation [200] of the matrix.

关 键 词：10Ni3MnCuAl钢 析出相 三维原子探针(3DAP) 原子空间分布 

分 类 号：TG156[金属学及工艺—热处理]