铁基自熔合金涂层T/M-GSA电弧钎涂研究  

Preparation of Fe-based self-fluxing alloy coating by T/M-GSA brazing

作　　者：李伟强[1] 程楠[1] 黄继华[1] 张玉凤[1] 陈树海[1] 赵兴科[1] 

机构地区：[1]北京科技大学,100083

出　　处：《焊接》2015年第2期29-33,70,共5页Welding & Joining

摘　　要：利用自制的药芯焊丝,通过T/M-GSA电弧钎涂工艺在Q235钢表面制备了铁基自熔合金涂层,涂层有较好的成形性,表面光亮致密且与基体为冶金结合。采用SEM,EDS,XRD和显微硬度分析,研究了涂层的微观组织、相组成和硬度分布。结果表明:涂层的微观组织主要是固溶了较多Cr,Si的γ-(Fe,Ni)作为涂层的基体相,少量的先析出相(Cr,Fe)_7C_3和大量的(Cr,Fe)_7C_3+γ-(Fe,Ni)共晶作为基体的支撑骨架。涂层平均的显微硬度超过HV_(0.1)500,约是钢基体的3倍。Cr,Si元素固溶在γ-(Fe,Ni)相中的引起的固溶强化以及析出的(Cr,Fe)_7C_3高硬度相是涂层得以强化的主要原因。The flux- cored wire was designed and prepared by authors,and Fe- based self- fluxing alloy coating was prepared on the surface of matrix Q235 by T/M- GSA brazing technology.The coating has good appearance and is dense and metallurgical bonding with the matrix.Microstructure and phase composition of coating were investigated by XRD,SEM and EDS.the hardness of the coating was tested by sclerometer.The results show that the matrix of the coating is γ-(Fe,Ni) in which more Cr,Si are dissolved.The coating consists of the primary reinforced phase of(Cr,Fe)_7C_3 and a lot of(Cr,Fe)_7C_3 +γ-(Fe,Ni) eutectic which distribute on the matrix of γ-(Fe,Ni).The average microhardness of the coating is more than 500HV0.1 and is about three times of matrix Q235.Cr and Si dissolve in γphase,which results in solid solution strengthening and the precipitated phase(Cr,Fe)_7C_3 with high hardness on the substrate,both the aspects lead to that the coating has premium properties.

关 键 词：铁基自熔合金 电弧钎涂 涂层微观组织 

分 类 号：TG147.445[一般工业技术—材料科学与工程]