常压等离子束扫描表面多元共渗研究

Study on Surface Multicomponent Cementation by Ordinary Pressure Plasma Jet Scanning

用高能等离子束在常压下快速扫描涂敷合金渗剂的４５＃ 钢管内表面， 可实现多元共渗及自激冷淬火， 获得多元共渗及淬火复合硬化层。用电子探针和透射电镜对硬化层的成分和组织结构进行分析， 结果表明， 渗剂中所含硼、硅、铈三种元素以不同深度渗入材料内部， 硬化层为隐针马氏体及硼硅化合物。经检测，硬化层具有较高的硬度及合理的硬度梯度， 具有优异的耐磨性及良好的耐蚀性。

Smearing the alloy permeation agent on the inside wall of 45 # steel tube in advance,then scanning the surface with high energy plasma jet at ordinary pressure, the multicomponent cementation and quenching were obtained The composition and microstructure of the harden layer were investigated by electron probe and transmission electron microscopy The results show that the depths through which B,Si,Ce penetrate are different one another The microstructures of the harden layer are needle like martensite and boron silicon compounds The level of the harden layer′s microhardness is high and the gradient of the microhardness is reasonable The wearability of the harden layer is well The corrosion resistance of the harden layer is improved obviously