Nb-xW-4Mo-1Zr-yC合金系的碳化物研究  

Studies on the Carbides in Nb-xW-4Mo-1Zr-yC Alloys

作　　者：蒋丽娟[1] 郑欣[1] 夏明星[1] 王晖[1] JIANG Lijuan;ZHENG Xin;XIA Mingxing;WANG Hui(Northwest Institute For Non-ferrous Metal Research,Xi'an 710016,Shaanxi,China)

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《中国钼业》2023年第4期57-61,共5页China Molybdenum Industry

基　　金：陕西省重点研发计划项目(编号:2022GY-386)。

摘　　要：通过电子束熔炼制备的Nb-xW-4Mo-1Zr-yC合金小铸锭,其中y分别为0.3、0.5、0.6。对合金铸锭进行均匀化热处理和高温挤压,研究了合金铸锭在均匀化热处理和高温挤压过程中第二相的形貌、大小和均匀性的变化。结果表明,C含量为0.3%(质量分数,下同)的铸锭中初生的碳化物第二相,能够在后来的1900℃/1 h均匀化热处理过程中溶解,在冷却过程中以细针、片状或球状碳化物析出;析出的碳化物第二相可在高温挤压过程中进一步破碎,并在退火后变得更均匀、细小;再经过热锻造加工,合金的碳化物能够进一步细化、均匀化,最终获得满意的组织结构和力学性能。挤压棒均匀化热处理+时效处理能够使合金中的绝大部分碳化物弥散分布。Nb-xW-4Mo-1Zr-yC alloy prepared by electron beam melting,where y is 0.3,0.5,and 0.6.The changes in the morphology,size and homogeneity of the second phase during the homogenisation heat treatment and high temperature extrusion of alloy ingots were investigated.The results show that the initial carbide second phase in the ingot with a C content of 0.3%(mass fraction)can be dissolved during the subsequent homogenisation heat treatment at 1900℃/1 h and precipitated as fine needle,flake or spherical carbides during cooling;the precipitated carbide second phase can be further broken during the high temperature extrusion process and become more uniform and finer after annealing;then after the hot forging process,the alloy's carbide can be further refined and homogenized,and finally obtain satisfactory organization structure and mechanical properties.Extrusion bar homogenisation heat treatment+ageing treatment can make most of the carbides in the alloy diffuse distribution.

关 键 词：铌合金 碳化铌 热加工 碳化物演化 

分 类 号：TG146.4[一般工业技术—材料科学与工程]