Dilution and Wear Evaluation for Stellite 6 Deposited on a Martensitic Stainless Steel Substrate by Laser Cladding (original) (raw)
Related papers
2016
Stellite 6 was deposited by laser cladding on an AISI 316L stainless steel substrate (ASS) with energy inputs of 1 kW (ASS 1) and 1.8 kW (ASS 1.8). The chemical compositions and microstructures of these coatings were characterized by atomic absorption spectroscopy, optical microscopy and scanning electron microscopy. The microhardness of the coatings was measured and the wear mechanism of the coatings was conducted using a pin-on-plate (reciprocating) wear testing machine. The results showed less cracking and pore development for Stellite 6 coatings applied to the austenitic stainless steel (AISI 316L stainless steel) substrate with the lower heat input (ASS 1). Further, the Stellite coating for ASS 1 was significantly harder than that obtained for ASS 1.8. The wear test results showed that the weight loss for ASS 1 was much lower than for ASS 1.8. The measurements of dilution and estimation of carbon content also showed that ASS 1 has lower dilution and higher concentration of carb...
Effect of Heat Input on Stellite 6 Coatings on a Medium Carbon Steel Substrate by Laser Cladding
Materials Today: Proceedings
Stellite 6 was deposited by laser cladding on a medium carbon steel substrate (MS) with energy inputs of 1. kW (MS 1) and 1.8. kW (MS 1.8). The chemical compositions and microstructures of these coatings were characterized by atomic absorption spectroscopy, optical microscopy and scanning electron microscopy. The microhardness of the coatings was measured and the wear mechanism of the coatings was assessed using a pin-on-plate (reciprocating) wear testing machine. The results indicated less cracking and pore development for Stellite 6 coatings applied to the medium carbon steel substrate with the lower heat input (MS 1). Moreover, the Stellite coating for MS 1 was significantly harder than that obtained for MS 1.8. The wear test results indicated that the weight loss for MS 1 was much lower than for MS 1.8. It is concluded that the lower hardness of the coating for MS 1.8, markedly reduced the wear resistance of the Stellite 6 coating.
MATEC Web of Conferences, 2016
Stellite 6 was deposited by laser cladding on a P91 substrate with energy inputs of 1 kW (P91-1) and 1.8 kW (P91-1.8). The chemical compositions, microstructures and surface roughnesses of these coatings were characterized by atomic absorption spectroscopy, scanning electron microscopy and atomic force microscopy. The microhardness of the coatings was measured and the wear mechanism of the coatings was evaluated using a pin-on-plate (reciprocating) wear testing machine. The results showed less cracking and pore development for Stellite 6 coatings applied to the P91 steel substrate with the lower heat input (P91-1). Further, the Stellite coating for P91-1 was significantly harder than that obtained for P91-1.8. The wear test results indicated that the weight loss for P91-1 was much lower than for P91-1.8. The surface topography data indicated that the surface roughness for P91-1 was much lower than for P91-1.8. The measurements of dilution and carbon content showed that P91-1 has lower dilution and higher concentration of carbon than P91-1.8. It is concluded that the lower hardness of the coating for P91-1.8, together with the softer underlying substrate structure, markedly reduced the wear resistance of the Stellite 6 coating and the lower hardness of the coating for P91-1.8 was due to higher level of dilution and lower concentration of carbon.
Procedia Materials Science, 2014
Stellite 6 was deposited by laser cladding of two different chromium-bearing steel substrates (P91 and P22). The chemical compositions, microstructures and surface roughnesses of these coatings were characterized by atomic absorption spectroscopy, optical microscopy, scanning electron microscopy and atomic force microscopy. The microhardness of the coatings was measured and the wear mechanism of the coatings was examined using a pin-on-plate (reciprocating) wear testing machine. The results showed less cracking and pore development for Stellite 6 coatings applied to the P22 steel substrate. Further, the Stellite coating on P22 steel was significantly harder than that deposited on the P91 steel. The wear test results showed that the weight loss for the coating on P22 steel was significantly lower than for the P91 steel substrate. The surface topography data showed that the surface roughness for the coating on P22 steel was much lower than for the P91 steel substrate. It is concluded that the residual C content for the deposit on P22 was higher, mainly because the lower concentration of strong carbide formers, compared to P91, reduced the extent of carbon loss in the deposit.
Analysis of the Geometry of Wear Tracks in Laser Deposited Stellite 6 Coatings
Journal of metallic material research, 2024
The substrates consisted of medium carbon steel (MS), a nickel-based superalloy (NIS), martensitic stainless steel (MSS), austenitic stainless steel (ASS), 2.25% chromium creep resisting steel (P22) and 9% chromium creep resisting steel (P91). The laser powers were 1.0 and 1.8 kW and wear testing was
2014
Stellite 6 coatings were deposited using laser cladding, high velocity oxygen fuel (HVOF) thermal spraying and plasma spraying techniques on a nickel alloy substrate. The surface roughness, chemical composition and microstructure of these coatings were characterised by a surface profilometer, optical microscopy (OM) and scanning electron microscopy (SEM). The microhardness of the coatings was measured and the wear behaviour of the coatings was examined under controlled test conditions in a pin-on-plate (reciprocating) tribometer. The results showed that fully dense and crack-free laser clad Stellite 6 coatings can be formed on a high nickel steel substrate. Average microhardness values of the matrix for the coatings were in the range 350-520 HV and the pin-on-plate (reciprocating) wear tests showed the laser cladding coating performed the highest wear resistance compared to the other two coatings.
Materials
Laser metal deposition (LMD) is one of the manufacturing processes in the industries, which is used to enhance the properties of components besides producing and repairing important engineering components. In this study, Stellite 6 was deposited on precipitation-hardened martensitic stainless steel (17-4 PH) by using the LMD process, which employed a pulsed Nd:YAG laser. To realize a favor deposited sample, the effects of three LMD parameters (focal length, scanning speed, and frequency) were investigated, as well as microstructure studies and the results of a microhardness test. Some cracks were observed in the deposited layers with a low scanning speed, which were eliminated by an augment of the scanning speed. Furthermore, some defects were found in the deposited layers with a high scanning speed and a low frequency, which can be related to the insufficient laser energy density and a low overlapping factor. Moreover, various morphologies were observed within the microstructure of...
International Journal of Refractory Metals and Hard Materials, 2016
The paper focuses on the study results of Stellite-6/WC metal matrix composite coatings (MMC coatings) produced by laser cladding technology using a 1 kW continuous wave Yb: YAG disk laser with powder feeding system. Specimens were preparation using CNC machining center equipped with a laser nozzle. Powder mixtures containing 60% tungsten carbides particles and 40% commercial Stellite-6 powder were used. In this study, three different values of laser beam power (400 W, 550 W and 700 W) and three different powder feed rate (5.12 g/min, 10.24 g/min and 15.36 g/min) were used. For all specimens, the same scanning speed of laser beam were applied. Changes in roughness, microstructure as well as wear resistance were investigated. It was found that increasing laser beam power caused a decrease in wear resistance of coating. Furthermore in described process appeared the best value of the powder feed rate which potentially resulting in better wear resistance. Exceeding this value influence on more intensive wear of coating. Special attention was given to the wear mechanism of MMC coatings.