TIG焊Fe基非晶合金堆焊层的组织和性能

Microstructure and Properties of Iron Based Amorphous Alloy Surfacing Layer Prepared by TIG Welding

以一种含Fe、Cr、B、Mn、Si等元素的新型Fe基合金药芯焊丝作为堆焊材料,利用TIG焊在13Mn钢的基体上制备堆焊层。借助SEM、XRD、DSC等手段观察和分析了堆焊层的组织形貌、物相构成及非晶相的起始晶化温度,同时测定了堆焊层的显微硬度和常温耐磨性能。结果表明:新型Fe基合金堆焊层结构均匀致密,与基体结合性好;堆焊层中非晶含量约为31.06vol%,起始晶化温度Tx=582.3℃;堆焊层具有较高的显微硬度与耐磨性能,近表面的显微硬度达1000～1200HV0.1,耐磨性能优于高铬铸铁,尤其是水冷处理的堆焊层耐磨性为高铬铸铁的2倍。

A new type iron based alloy powder welding wire consisting of Fe,Cr, B,Mn,Si and so on was welded onto 13Mn steel substrate using TIG welding to create an amorphous surfacing layer. The scanning electron microscopy（SEM）, X-ray diffraction （XRD） and differential scanning calorimetric （DSC） were used to analyze the microstructure, morphology and phase composition of the surfacing layer and the original crystallization temperature of the amorphous. The microhardness and wear resistance were also tested. The results show that the iron based alloy surfacing layer is density and firmly welds to the substrate. The amorphous content of the surfacing layer is about 31.06%（volume fraction） and the crystallization temperature of the amorphous surfacing layer is about 582.3℃. The surfacing layer has high microhardness and wear resistance, and the mierohardness near the surface reaches 1000-1200HV0.1.The wear-resisting is better than high chromium cast iron, especially, the wear resistance of the surfacing layer for water treatment is 2 times higher than high chromium cast iron.