Study on W-Mo-Dy Multi-Elements Diffusion Layer

Abstract:

W-Mo-Dy and W-Mo permeation were carried out on the 20 steel by plasma surface metallurgy technology. The microstructure, cross-section morphology ，distribution of alloy element and phase structure of diffusion layer were tested and observed. The results showed that: thickness of alloy layer was 128μm, 108μm, there is a dividing line between the diffusion layer and the substrate, indicating that the permeation process follow with reaction-diffusion phenomena; Compared with W-Mo diffusion layer，the grain size of W-Mo-Dy diffusion layer were fine grain；The basic phase composition of W-Mo-Dy diffusion layer were solid solution of (W, Mo, Dy) in Fe, Dy₂O₃ and a small quantity of Dy Fe₁₀Mo₂; The basic phase composition of W-Mo diffusion layer was solid solution of (W, Mo) in Fe.The surface alloy contents of W-Mo-Dy diffusion layer were 4.81%, 9.99%, 4.4% (wt%), which of W-Mo diffusion layer were 3.04%, 7.68% (wt%);Heavy rare earth （Dy）has a significant penetration and improved the organizations of diffusion layer.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 2031-2034
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.2031
• Online since: November 2011
• Authors: Wei Zhang, Yuan Gao, Lin Yuan, Cheng Lei Wang
• Keywords: Alloy Diffusion Layer, Heavy Rare Earth (Dy), Plasma Surface Metallurgy, W-Mo-Dy Permeation

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