کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1661307 | 1008422 | 2008 | 14 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Influence of nitridation on surface microstructure and properties of graded cemented carbides with Co and Ni binders Influence of nitridation on surface microstructure and properties of graded cemented carbides with Co and Ni binders](/preview/png/1661307.png)
The influence of a nitridation treatment on the microstructure and the properties of (W,Ti)C-based cemented carbides with Co and Ni binders is investigated. Nitridation results in the formation of a very fine-grained (Ti,Ta,Nb)(C,N) phase (γN-phase) with inclusions of binder and WC clusters in the near-surface region of the cemented carbides. Rietveld refinements of X-ray diffractograms reveal differences in the domain size and the microstrains of the γN-phase for cemented carbides with Co-binder and Ni-binder. Nitridation reduces the domain size and increases microstrains in the γ-phase. The chemical composition, the morphology and defects of the binder were investigated by TEM/EDX before and after the nitridation treatment. The results reveal that a high nitrogen activity leads to the preferred dissolution of the core-rim structure of the mixed cubic carbide grains during the formation of the γN-phase. The nitridation heat treatment improves the wear and corrosion resistance of cemented carbides with both Co-binder and Ni-binder.
Journal: Surface and Coatings Technology - Volume 202, Issue 24, 15 August 2008, Pages 5962–5975