稀土Ce对Fe-Ni-Al马氏体时效钢等温过程显微组织演变的影响  

Effect of Rare Earth Ce on Microstructure Evolution of Fe-Ni-Al Maraging Steel During Isothermal Process

作　　者：谭会杰 王海燕[1] 华连庚 高雪云 吕萌 于大威 邢磊 TAN Huijie;WANG Haiyan;HUA Liangeng;GAO Xueyun;LYU Meng;YU Dawei;XING Lei(School of Materials Science and Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;Inner Mongolia First Machinery Group Co.,Ltd.,Baotou 014010,Inner Mongolia,China)

机构地区：[1]内蒙古科技大学材料科学与工程学院,内蒙古包头014010 [2]内蒙古第一机械集团股份有限公司,内蒙古包头014010

出　　处：《材料导报》2025年第7期195-200,共6页Materials Reports

基　　金：国家自然科学基金(51961030;52161008);中央引导地方科技发展资金项目(2022ZY0072);阳江市合金材料与五金刀剪重点产业人才振兴计划专项基金(RCZX2022020)。

摘　　要：通过OM、XRD、SEM、TEM等手段系统研究了马氏体时效钢在时效过程中显微组织演变规律及其力学性能,并与添加稀土Ce的马氏体时效钢进行了对比分析。结果表明,两种试验钢的硬度随着时效时间延长呈先上升,后进入宽的硬度平台趋势。加入稀土Ce后,试验钢内部板条马氏体束变得更加细小,板条分布更加弥散均匀,试验钢的硬度略微降低,在500℃时效3 h后,掺加稀土Ce的试验钢的延伸率有所增加,但强度变化不大,抗拉强度达到2 053 MPa。试验钢在时效过程中,内部析出两种类型的析出物,一种为较大尺寸的NbC析出颗粒,另一种为小尺寸的弥散分布的NiAl相。加入稀土Ce后,NbC析出相尺寸变小,NiAl相的析出变缓。利用HRTEM表征后发现,B2-NiAl析出相与基体共格,同时得到了B2相和基体的晶格常数,二者的错配度为0.2%。The microstructure evolution and mechanical properties of maraging steel were systematically studied by OM,XRD,SEM and TEM,and compared with those of maraging steel with rare earth Ce.The results show that the hardness of two experimental steels increased firstly with the aging time,and then entered a wide hardness plateau.Compared with ordinary maraging steel,the mareging steel with rare earth Ce has finer lath martensite and more uniform martensite laths distribution,but its hardness decreases slightly.After aging at 500℃for 3 h,the elongation of the experimental steel with rare earth Ce increases,and the strength change little,the tensile strength reaches 2053 MPa.There are two types of precipitation with the aging to the experimental steel.One is NbC precipitated particles with larger size,the other is dispersed B2-NiAl phase with smaller size.After the addition of rare earth Ce,the size of NbC precipitation decreases,and the precipitation of NiAl phase is delayed.The lattice constants of the B2 phase and the matrix were obtained by HRTEM.The B2-NiAl is coherent with the matrix,and the mismatch between the two phases is 0.2%.

关 键 词：马氏体时效钢 稀土Ce 显微组织 析出相 

分 类 号：TG142.1[一般工业技术—材料科学与工程]