Nb-Ti系堆焊层的组织和耐磨性的研究  

Microstructure and wear resistance of welding surfacing layer of Nb-Ti alloy system

作　　者：汤文博[1] 郭云刚[1] 魏建军[2] 黄智泉[2] 

机构地区：[1]郑州大学材料科学与工程学院,450001 [2]郑州机械研究所,450001

出　　处：《焊接》2009年第8期37-40,共4页Welding & Joining

摘　　要：为了提高焊条材料表面的耐磨性,通过对焊层中合金元素的设计,成功研制了一种适用于抗磨料磨损条件下的Nb-Ti系堆焊焊条(焊条代号109#)。采用磨损试验机、硬度试验机、光学显微镜、扫描电镜、EDAX能谱分析仪对堆焊层的平均硬度、磨料磨损试验的磨损失重及微观组织进行了分析,研究了堆焊层合金系统的耐磨料磨损性能。结果表明,由于堆焊层组织为混合型马氏体和少量残余奥氏体+弥散分布的一次NbC-TiC颗粒,而且低碳马氏体和高碳马氏体数量相当。由于形成弥散的MC型碳化物第二相及强韧的基体,该焊条具有抗裂性好,焊前不需预热、焊后不需缓冷及连续堆焊不产生裂纹的特点。To improve the wear resistance of materials through the design of the alloy elements in the surfacing layer,a new kind of NbC-TiC alloy system alloy with good wear-resistance was developed.The hardness gauge,wear test,OM,SEM and the EDAX pattern were used to analyze the average hardness,the abrasion weight loss and mierostructure of deposited metal.The results showed that mierostrueture of the hardfaced metal with optimization hardfaeing electrode was the mixed martensite and a little retained anstenite with NbC-TiC which are distributed in the matrix dispersively.The amount of low-carbon and high-carbon martensite was equivalent in quantity.The alloy system shows good wear resistance due to the formation of dispersed MC type carbides and tough low carbon martensite matrix.A kind of hardfaeing electrode with wearing resistance and cracking resistance was developed,which the hardfaeing metal is crack-free even under the conditions of non-preheating and non-postheating.

关 键 词：堆焊 耐磨性 组织 碳化物 

分 类 号：TG421[金属学及工艺—焊接]