Residual stress analysis in PVD coated austempered ductile iron

D.A. COLOMBO; M.D. ECHEVERRíA; O.J. MONCADA; J.M. MASSONE

ISIJ INTERNATIONAL

IRON STEEL INST JAPAN KEIDANREN KAIKAN

Lugar: Tokio; Año: 2013 vol. 53 p. 520 - 526

0915-1559

The aim of this work is to study residual stresses (RS) in PVD TiN and CrN coated ADI substrates withdifferent nodule counts, austempering temperatures and surface finishing methods (grinding and polishing).Coatings were applied by arc ion plating using an industrial reactor and different sets of processingparameters. Residual stress measurements were performed by x-ray diffraction using the sin2ψ methodalong two principal axes on the samples surface (parallel and perpendicular to the substrate abrasiondirection). The film thickness, hardness and adhesion of each coated sample were also evaluated.The results obtained indicate that RS in TiN and CrN coated samples are compressive irrespective ofthe different substrates, surface finishing methods and processing parameters utilized. The parallel andperpendicular RS do not vary significantly, indicating a rotationally symmetric biaxial stress state. The RSof the coated samples are not influenced by the different substrate characteristics regarding microstructure,hardness and surface roughness. The microhardness and RS of TiN and CrN coated samplesincrease with film thickness. The increase in substrate temperature together with the decrease in the valuesof BIAS voltage, arc current and chamber pressure lead to microhardness and RS reduction. Grindingproduces surface hardening and reduction of the compressive RS in the substrates, but causes no variationsin the RS of the TiN and CrN coated samples. The adhesion strength quality of TiN and CrN coatingsto ADI substrates can be related to indices ranging from HF1 to HF2