Effects of Combined Surface Modification on Adhesion Strength of CrN Coatings for STS420

Abstract:

In order to improve the durability and performance of molds and tools, diverse methods of surface modification are used where the adhesion strength between a substrate and coating plays an important role. To improve adhesion strength, a combined surface modification method is often utilized. In this study, adhesion strength and microstructure of various combined surface modifications (i.e., ion-nitriding, Cr intermediate layer, CrN layer and nitrogen ion- implantation) were examined on STS420. Phase constituents, microstructure, adhesion strength and hardness of coating-substrate system with combined surface modification were examined by using optical microscopy, X-ray diffraction, transmission electron microscopy, scratch test, and nano-indentation. The highest adhesion strength was observed when CrN coating was formed by nitrogen implantation on ion-nitrided substrate with a Cr-intermediate layer. Influence of processing sequence and combination is related to microstructural observations and adhesion strength.

• Periodical: Defect and Diffusion Forum (Volumes 297-301)
• Pages: 1334-1339
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.297-301.1334
• Online since: April 2010
• Authors: G.C. Jeong, H.J. Choi, Yong Ho Sohn, S.I. Kwun
• Keywords: Combined Surface Modification, Implantation, Nanoindentation, Nitride

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