热处理对Fe-Mo-Cr-B堆焊合金组织的影响  

Effect of heat treatment on the microstructure of Fe-Mo-Cr-B hardfacing alloys

作　　者：张恒[1] 潘应君[1] 柯德庆[1] 洪波[1] 陆旭锋[1] 

机构地区：[1]武汉科技大学材料与冶金学院,湖北武汉430081

出　　处：《武汉科技大学学报》2016年第3期180-184,共5页Journal of Wuhan University of Science and Technology

基　　金：湖北省科技攻关计划项目(2004AA101C49)

摘　　要：以Mo、B、Cr、Ni、C及Fe粉末为药芯,低碳冷轧H08A钢为外皮,采用药芯焊丝埋弧堆焊方法制备FeMo-Cr-B堆焊合金,并分别对堆焊试样进行淬火与退火处理。结合光学显微镜、SEM、EDS、XRD及硬度测试等手段,研究热处理前后堆焊层组织、物相、成分及硬度变化。结果表明,Fe-Mo-Cr-B堆焊合金组织由α-Fe、Mo2FeB2、(Fe,Cr)2B及少量(Fe,Cr)_(23)(B,C)_6组成;堆焊试样在经950℃保温30min淬火或退火处理后,网状硼化物共晶组织消失,其物相组成为α-Fe和颗粒Mo2FeB2,且退火试样中Mo2FeB2数量较多;热处理后试样堆焊层硬度分布较为均匀,硬度显著提高,且其与基体结合界面过渡层的厚度增加。Taking Mo,B,Cr,Ni,C and Fe powders as the flux-core and low carbon cold rolled steel H08 Aas the skin,Fe-Mo-Cr-B hardfacing alloys were prepared by the method of flux-cored wire submerged arc welding,and the obtained samples were quenched and annealed respectively.By means of optical microscope,SEM,EDS,XRD and hardness test,the variations in microstructure,phase,composition as well as microhardness of hardfacing alloy samples before and after heat treatment were investigated.The results show that the as-welded Fe-Mo-Cr-B hardfacing alloy consists ofα-Fe,Mo2FeB2,（Fe,Cr）2B and a small amount of（Fe,Cr）（23）（B,C）6.After annealling or quenching at 950℃for 30 min,the reticular boride eutectic structures in the surfacing layer of hardfacing sample disappear and the sample is composed ofα-Fe and granular Mo2FeB2.Also,the annealing sample contains more Mo2FeB2.Meanwhile,the surfacing layers of heat-treated samples have more uniform hardness distribution and higher hardness values along with the thicker transition layers between welding layer and substrate.

关 键 词：药芯焊丝 堆焊 热处理 Mo2FeB2 显微组织 硬度 

分 类 号：TB331[一般工业技术—材料科学与工程]