稀土镧对Fe-Ni-Al马氏体时效钢中碳化物析出行为和拉伸性能的影响  

Effect of Rare Earth La on Carbide Precipitation Behavior and Tensile Property of Fe-Ni-Al Maraging Steel

作　　者：周桐 王海燕(导师)[1] 华连庚 曹悦 邢磊 姚柯 于大威 ZHOU Tong;WANG Haiyan;HUA Liangeng;CAO Yue;XING Lei;YAO Ke;YU Dawei(Inner Mongolia Key Laboratory of Advanced Metal Materials,School of Materials Science and Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia First Machinery Group Co.,Ltd.,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料科学与工程学院,内蒙古自治区新金属材料重点实验室,包头014010 [2]内蒙古第一机械集团股份有限公司,包头014010

出　　处：《机械工程材料》2025年第1期51-58,共8页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(52161008,52361012);中央引导地方科技发展资金资助项目(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资助项目(RCZX2022020);内蒙古自治区直属高校基本科研业务费资助项目(2023QNJS006)。

摘　　要：熔炼制备了未添加和添加质量分数0.02%镧的Fe-Ni-Al马氏体时效钢,并进行了900℃×0.5 h的固溶处理以及500℃不同时间(0,0.25,0.50,1.00,2.00,3.00,4.00 h)的等温时效处理,研究了稀土镧对试验钢的马氏体组织和析出相演变以及拉伸性能的影响。结果表明:随着时效时间延长,试验钢中马氏体组织出现了回复现象,(Nb,Mo)C析出相长大并聚集;镧的添加可以促进马氏体组织回复和碳化物析出,细化碳化物尺寸并抑制其在晶界处聚集;延长时效时间后,未添加镧试验钢的抗拉强度增大,断后伸长率减小,而添加镧试验钢的抗拉强度和断后伸长率均增大,而这归因于(Nb,Mo)C的大量析出起到的强化作用以及镧的添加对马氏体组织回复的促进作用。Fe-Ni-Al maraging steels without La and with 0.02%(mass fraction)La were smelted and treated by solid solution at 900℃for 0.5 h and isothermal aging at 500℃for different times(0,0.25,0.50,1.00,2.00,3.00,4.00 h).The effects of La on the evolution of martensitic structure,precipitated phase and tensile properties of the test steel were studied.The results show that the martensitic structure in the test steel had a recovery phenomenon with the extension of aging time,the precipitation of(Nb,Mo)C was coarsened and aggregated.The addition of La could promote the recovery of martensitic structure and the precipitation of carbide,refine the size of carbide and inhibit its aggregation at the grain boundary.By extending aging time,the tensile strength of the test steel without La increased and the percentage elongation after fracture decreased,while the tensile strength and percentage elongation after fracture of the steel with La all increased.The strengthening effect of a large amount of precipitation of(Nb,Mo)C and the promotion effect of La addition on the recovery of martensite structure were the reason for the simultaneous improvement of strength and plasticity of the test steel containg La.

关 键 词：稀土镧 马氏体时效钢 等温时效 (Nb Mo)C析出相 

分 类 号：TG142.1[一般工业技术—材料科学与工程]