等离子表面W、Mo、Y共渗制备强化层的研究
Study on Strengthened Layer Prepared by Plasma Surface W-Mo-Y Co-diffusion
李 冰, 高 原, 陈选楠, 黄学锋
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作者单位：桂林电子科技大学 材料科学与工程学院, 广西 桂林 541004)
中文关键字：等离子； 共渗； 稀土； 离子氮化
英文关键字：plasma; co-diffusion; rare earth; plasma nitriding
中文摘要：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。
英文摘要：W-Mo-Y co-diffusion layer was prepared on the surface of Q235 steel by double glow plasma metallurgy and plasma nitriding process. And then the wear tests were conducted. The microstructure, composition and phase of strengthened coating were analyzed by metalloscope, XRD and EDS. The results show that the microstructure of W-Mo-Y co-diffusion layer is columnar crystal; W, Mo contents decrease from the outside to the inside. The Y element distributes non-uniformly. The phase of alloying layer consists of Fe, Fe3Mo, Fe17Y2 and the solid solution of (W, Mo, Y) in α-Fe. After plasma nitriding process, the co-diffusion layer is strengthened and a large amount of nitrides form and dispersedly distribute in the alloying layer. After nitriding, the phase of alloying layer consists of Fe4N, Fe3Mo, Fe, MoN, Mo2N, W2N and WN. By contrast experiments, the addition of element Y can make the hardness of alloying layer be increased by 100 HV0.1. The wear resistance of alloying layer is improved by 1.58 times compared with the contrast specimen in the abrasive wear tests.