弧比变化对电火花沉积Ni201修复层界面行为的影响

Effects of Different Arc Rates on Interface Behavior of Ni201 Repaired Layers by Electro?spark Deposition

再制造修复设备工艺参数选择是决定修复层质量的关键因素。利用电火花沉积技术,在Q235钢表面制备Ni201修复改性层,对比分析弧比取不同值时对修复层质量的影响,并利用扫描电镜（SEM）、能谱仪（EDS）、X射线衍射（XRD）等检测方法,研究了修复层与基体结合界面的微观结构、元素分布及相组成。结果表明：弧比取值在35%~45%之间时,修复层组织均匀致密,基体元素与修复层元素相互扩散形成冶金结合,修复层主要由Fe19Ni、Co3Fe7、Fe0.9Si0.1和C0.055Fe1.945相组成。

The key factor affected on the quality of the repaired layers was determined by the processing parameter selection of remanufacturing equipment.Ni201 repaired layers on Q235 steel surface were prepared by electro-spark deposition technology,the effects of different arc rates on the quality repaired layers were analyzed.The microstructure,chemical elements distribution and phase composition of the bonding interface between repaired layer and substrate were investigated by means of scanning electron microscopy and energy dispersive spectrometer,and X-ray diffraction.The results show that the value of arc rate is between 35%~45%,the microstructure of the repaired layers is uniform and dense,the interdiffusion of elements demonstrates that the repaired layer is bonded metallurgically with the base,the main phase of the layer is composed of Fe19Ni,Co3Fe7,Fe0.9Si0.1and C0.055Fe1.945.