Abstract
This work evaluated the influence of titanium carbo-nitride (TiCN), chromium aluminum nitride (CrAlN), and boron carbo-nitride (BCN) coatings deposited on AISI 1045 steel and their behavior in fatigue life. Suitable deposition parameters were established to obtain appropriate deposition times for polycrystalline growth and desired stoichiometry, as well as a stable layer thickness of ~ 3 μm. The physical and chemical properties of the obtained coatings were established by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and nanoindentation. Scanning electron microscopy (SEM) was used for analyzing the fracture surfaces of the samples subjected to fatigue. The analysis of the fatigue behavior of the uncoated and coated substrates was performed under rotary bending conditions applying maximum alternating stresses in the interval of 55 to 70% of the ultimate strength value, i.e., from 479 to 610 MPa, respectively. The test was conducted at room temperature. It was established that the fatigue resistance properties increased for the three types of coated samples, TiCN, BCN, and CrAlN, with values of 9.6%, 4.2%, and 3.9%, respectively, calculated for 1 × 106 cycles. The highest value in fatigue life improvement corresponded to the TiCN coating. This is associated with the increase in the mechanical properties of the coating, as well as the lower presence of tensile type stresses. The mechanical and fatigue results found in these ternary coatings deposited on AISI 1045 steel open up the possibility of future applications in mechanical devices, e.g., automotive applications with high fatigue demands in service conditions.
Highlights
The physical vapor deposition (PVD) technique has been widely used in various industrial applications because the coatings improves the morphological, mechanical and tribological properties to various classes of substrates [1]
This current work evaluated the influence of Titanium Carbo-nitride (TiCN), Chromium Aluminum Nitride (CrAlN) and Boron Carbo-nitride (BCN) coatings deposited on AISI 1045 steel and its behavior in fatigue life
Literature presents few researches focused on studying the fatigue resistance of TiCN, CrAlN and BCN coatings deposited on AISI 1045 steel
Summary
The physical vapor deposition (PVD) technique has been widely used in various industrial applications because the coatings improves the morphological, mechanical and tribological properties to various classes of substrates [1]. The revision of the technical literature including the works and developments carried out in the last years in the obtaining and improvement of the physicochemical, mechanical and tribological properties of the PVD coatings, point out that the fatigue resistance of certain substrates will increase significantly with the addition of these coatings, due to an improvement in the fracture behavior for the material. The new advanced surface treatments are progressively spreading in the production of industrial elements including those belonging to the automotive industry The development of these new coatings simultaneously requires the study of other added properties such as fatigue resistance, to extend their application in certain operating conditions for a mechanical element. The aim of this work was to study the influence of carbo-nitrides and transition metal nitrides (TiCN, CrAlN and BCN) coatings deposited onto AISI 1045 steel under rotational fatigue behavior for protection synergies with potential applications for the metal-mechanic industry, which open a possibility of future applications in mechanical devices e.g. automotive applications that require high fatigue demands in service conditions
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