基体表面粗糙度对热丝TIG堆焊Inconel625组织和耐腐蚀性能的影响

Effect of Surface Roughness of AISI8630 on Microstructure and Corrosion Resistance of Inconel625 Cladding Layer by Using Hot-wire TIG

基体表面粗糙度对堆焊层组织和性能有着深刻的影响。采用热丝TIG在AISI8630表面堆焊Inconel625,研究基体表面粗糙度对堆焊层组织和耐腐蚀性能的影响。应用OM,EDS及SEM等对堆焊层的元素分布以及显微组织进行分析,采用失重法测定堆焊层腐蚀速率。结果表明:随着基体粗糙度值的减小,堆焊过程的陷光效应相应减弱,堆焊稀释率降低。堆焊层中铁元素含量随之减少,显微组织更加细化,分布更加均匀。当基体粗糙度值由12.5μm减小到0.4μm时,堆焊层耐腐蚀性能提高32%。

Surface roughness has a profound influence on the microstructure and properties of cladding layer.Clad Inconel625 on AISI8630 surface by using hot-wire TIG and the effect of surface roughness of AISI8630 on microstructure and corrosion resistance was studied.The microstructure and distribution of Fe element of cladding layer were analyzed by means of optical microscope（OM）,energy dispersive spectroscopy（EDS）,and scanning electron microscopy（SEM）.Mass loss method was carried out to determine the corrosion ratio.The results indicate that with the reduction of surface roughness,the light trapping effect,dilution ratio and Fe content are all reduced and the grains become finer and are distributed more uniformly.When the surface roughness is decreased from 12.5μm to 0.4μm,the corrosion resistance of cladding layer is improved by more than 32%.