Growth texture and residual stress were determined by X-ray Diffraction (XRD) methods in three different nitride coating systems (TiN or (Ti,Cr)N single-layers and TiN/Ti two-layers) deposited by reactive sputtering on AISI 304 stainless steel. All samples exhibited the fibre texture typical of many PVD layers grown under non-epitaxial conditions, and the nitride layer had the well-known fcc structure of δ-TiN. The main growth direction in TiN coatings (independently of the presence of the Ti buffer) was [111], even if a secondary [211] grain fraction was produced by a twin growth mechanism that partially relaxed the intense compressive stress (≈ −8 GPa). The Ti buffer layer, also in a compressive state, contributed to a further reduction of the in-plane compression in the TiN top coat. The residual stress in the (Ti,Cr)N coatings was very high (≈ −17 GPa), probably due to the different growth texture (nearly [h00]) and the absence of suitable stress relaxation mechanisms.

(Ti,Cr)N and Ti/TiN PVD Coatings on 304 Stainelss Steel Substrates: texture and Residual Stress

Leoni, Matteo;Scardi, Paolo;Rossi, Stefano;Fedrizzi, Lorenzo;
1999

Abstract

Growth texture and residual stress were determined by X-ray Diffraction (XRD) methods in three different nitride coating systems (TiN or (Ti,Cr)N single-layers and TiN/Ti two-layers) deposited by reactive sputtering on AISI 304 stainless steel. All samples exhibited the fibre texture typical of many PVD layers grown under non-epitaxial conditions, and the nitride layer had the well-known fcc structure of δ-TiN. The main growth direction in TiN coatings (independently of the presence of the Ti buffer) was [111], even if a secondary [211] grain fraction was produced by a twin growth mechanism that partially relaxed the intense compressive stress (≈ −8 GPa). The Ti buffer layer, also in a compressive state, contributed to a further reduction of the in-plane compression in the TiN top coat. The residual stress in the (Ti,Cr)N coatings was very high (≈ −17 GPa), probably due to the different growth texture (nearly [h00]) and the absence of suitable stress relaxation mechanisms.
2
Leoni, Matteo; Scardi, Paolo; Rossi, Stefano; Fedrizzi, Lorenzo; Y., Massiani
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11572/72798
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