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在不同含碳量的钢表面进行等离子W-Mo-Dy和W-Mo共渗,采用光学显微镜观察合金渗层的显微组织和厚度,使用X射线衍射仪(XRD)对合金渗层进行相结构分析,利用附带能谱仪的扫描电镜(SEM)对合金渗层进行形貌观察和成分检测。研究结果表明:稀土Dy能促进合金元素的扩散使合金渗层厚度增加,20钢、45钢、T8钢W-Mo-Dy和W-Mo共渗合金层厚度分别为128,75,47μm及107,59,26μm;W-Mo-Dy共渗组织较W-Mo共渗组织更细小,多为等轴晶,而后者为柱状晶;W-Mo-Dy共渗合金层中有析出的第二相,由Fe,Mo,Dy构成;20钢的W-Mo-Dy共渗合金层主要由Fe(W,Mo,Dy),Dy2O3和少量的DyFe10Mo2,Dy等相组成,在45钢和T8钢表层出现M6C碳化物,随着含碳量增加,碳化物的含量也增加;W-Mo共渗合金层的表面呈上凸的胞状组织,排列致密,W-Mo-Dy共渗的表面形貌在胞状组织的中心出现块状的结晶组织。
Plasma W-Mo-Dy and W-Mo co-permeation were carried out on the surface of steel with different carbon content. The microstructure and thickness of the alloy infiltrated layer were observed by optical microscope. The alloy infiltrated layer was characterized by X-ray diffraction Structural analysis, the use of attached spectrometer scanning electron microscopy (SEM) on the alloy layer morphology and composition inspection. The results show that the rare earth Dy can promote the diffusion of alloying elements to increase the thickness of alloy infiltrated layer. The thickness of W-Mo-Dy and W-Mo co-infiltrated alloy layers of 20, 45 steel and T8 steel are 128, 75, 47 and 107 , 59,26μm. W-Mo-Dy co-infiltrated microstructure is much smaller than W-Mo co-infiltrated microstructure, mostly equiaxed and columnar. W-Mo-Dy co- Phase consists of Fe, Mo and Dy. The W-Mo-Dy alloying alloy layer of 20 steel consists mainly of Fe (W, Mo, Dy), Dy2O3 and a small amount of DyFe10Mo2, Dy, The M6C carbides appear on the surface and the carbide content increases with the increase of carbon content. The surface of the W-Mo alloying alloy layer is convex cell structure, densely arranged, surface morphology of W-Mo-Dy co-infiltration Lumpy crystalline tissue appears in the center of the cellular tissue.