Fatigue resistance of CrN thin films deposited by arc evaporation process on H11 tool steel and 2205 duplex stainless steel

Abstract

A B S T R A C T Notwithstanding the wide use of PVD coated components, not only in fields where tribological behaviour is important and well assessed, fatigue behaviour is still an object of research in applications where enhanced fatigue resistance is required. The aim of this paper is to analyse fatigue crack growth mechanisms and to relate their nucleation sites to the microstructure and to residual stress data. Two structural steels were used as the substrate (H11 tool steel grade and 2205 duplex stainless steel grade), while a monolayer of CrN, 5 µm deep, was deposed as a coating. Four-point bending fatigue tests were carried out in order to obtain the bending fatigue limit. Experimental results obtained by scanning electron microscopy analyses, residual stresses measurements and hardness evaluations carried out using a nanoindenter device were considered to explain the fatigue mechanisms involving a PVD coated part in terms both of nucleation site and crack growth process.

Tribological and corrosion behavior of CrN coatings: Roles of substrate and deposition defects

“…Several published data on single and multilayer PVD coatings consider the effects of the interface adhesion, of the residual stress distribution, and of the type of the microstructure that strongly influences the mechanical behavior of the substrate/coating system [11][12][13]. However, only few studies correlated coating performances with the substrate mechanical properties [14] and the coating defects in terms of wear behavior and corrosion resistance.…”

Investigation on Microblasting Applied to CrN Coatings

“…Additionally, a study on CrN deposited on steel demonstrates that the fatigue resistance is enhanced after the mechanical surface treatment, due to the increase in the residual compressive stress of the substrate skin [13]. As known, in fact, the fatigue cracks in PVD coated parts nucleate at the interface between coating and substrate [14,15].…”

Impact of DLC Coating Deposition on the Fatigue Strength of Al-7075-T6 Aluminum Alloy

“…If the deposited layer is free from defects, and does not delaminate, these compressive stresses are expected to improve fatigue life [33][34][35][36][37][38][39]. However, it has been observed that the deposition of a coating reduces the strength of aluminum components [40] while has little effect on the fatigue resistance of steel components [41,42].…”