钴基合金TIG堆焊层界面组织及性能的研究  

Study on Microstructure and Properties of Cobalt-base Alloys Hardfacing Metal Deposited by TIG Welding

作　　者：李国栋[1] 栗卓新[1] 杨津瑜 冯吉才[3] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124 [2]中油管道机械制造有限公司,河北廊坊065000 [3]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001

出　　处：《热加工工艺》2014年第21期50-52,共3页Hot Working Technology

基　　金：先进焊接与连接国家重点实验室开放课题研究基金资助项目(AWJ-M13-01)

摘　　要：采用钨极氩弧焊在X45CrSi9-3钢基体表面堆焊钴基合金。堆焊后,将堆焊试样分别放入500、550、650、700、750及780℃的热处理炉中对其进行热处理。对不同温度热处理后堆焊层的硬度进行了测试,采用光学显微镜观察了母材及不同温度热处理后堆焊层的金相组织。研究结果表明:在氩弧焊热源作用下,X45CrSi9-3钢表面发生微熔。钴基合金进入熔池后并未与基体发生剧烈的熔池搅拌。堆焊后,堆焊层界面平齐,无气孔及裂纹等缺陷,实现了冶金结合。钴基合金堆焊层的组织为共晶碳化物相(Cr,Fe)7C3和基体相γ(Co)。(Cr,Fe)7C3呈共晶形貌,并将γ(Co)夹于其间。随着焊后热处理温度的提高,堆焊层洛氏硬度值增加;热处理温度达到750℃时,其硬度值最高,进一步提高热处理温度,硬度值略有下降。Cobalt-base alloys were deposited on the surface of X45 CrSi9-3 steel with tungsten inert gas welding, and the deposited metals were heat treated at the temperature of 500℃, 550℃,600℃, 650℃,700℃,750℃,780℃, respectively. The microstructure was observed by optical microscope. The hardness tests were carried out by Rockwell hardometer. The research results show that, the surface of X45 CrSi9-3 steel melted slightly under the effect of argon arc. Cobalt-base alloys enter into the molten pool, and did not stir the melted base metal. The interface between the base metal and deposited metal is smooth, and there are not any defects such as pores and cracks. A metallurgical bonding was achieved. The microstructure of deposited metal was（Cr,Fe）7C3eutectic phase and γ（Co） phase. γ（Co） phase was enclosed by（Cr,Fe）7C3eutectic phase. With heat treated temperature increasing, the hardness of the deposited metal increases.

关 键 词：钨极氩弧焊 钴基合金 堆焊 

分 类 号：TG455[金属学及工艺—焊接]