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利用等离子表面冶金技术在Q235钢表面进行W、Mo、Y共渗,然后对共渗层进行离子氮化处理得到强化层。用金相显微镜、能谱仪、XRD对共渗层及强化层的组织、结构、成分和物相进行检测分析。结果表明:共渗层组织为柱状晶,W、Mo合金元素的含量由表及里逐渐减小,Y元素分布不均匀;共渗层由Fe3Mo、Fe17Y2和(W、Mo、Y)在α-Fe中的固溶体等物相组成;共渗层离子氮化后的强化层有大量氮化物弥散分布,主要物相为Fe4N、Fe3Mo、MoN、Mo2N、W2N和WN等。通过对比发现,Y元素的加入使强化层硬度提高100 HV0.1左右;在磨粒磨损的条件下,强化层耐磨性比对比试样提高1.58倍。
The surface of Q235 steel was plasma infiltrated with W, Mo and Y by plasma surface metallurgy technique, and then the nitriding layer was treated by ion nitriding to obtain the strengthening layer. The microstructure, structure, composition and phase of the common diffusion layer and the strengthening layer were detected and analyzed by metallographic microscope, energy dispersive spectrometer and XRD. The results show that the microstructure of the co-infiltrated layer is columnar. The content of W, Mo alloy decreases gradually from the surface to the surface, and the distribution of Y element is inhomogeneous. The co-diffusion layer consists of Fe3Mo, Fe17Y2 and (W, Mo, Y) Fe in the solid solution and other phase composition; common layer ion nitrided strengthening layer has a large number of nitride dispersed distribution, the main phase is Fe4N, Fe3Mo, MoN, Mo2N, W2N and WN. It is found by comparison that the addition of Y element increases the hardness of the strengthened layer by about 100 HV0.1. Under abrasive wear condition, the wear resistance of the strengthened layer increases by 1.58 times than that of the control sample.