Optimization of the laser remelting process for HVOF-sprayed Stellite 6 wear resistant coatings

Ciubotariu, Costel-Relu; Frunzăverde, Doina; Mărginean, Gabriela; Şerban, Viorel Aurel; Bîrdeanu, Aurel Valentin

doi:10.1016/j.optlastec.2015.09.005

Cited by 49 publications

(26 citation statements)

References 10 publications

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“…The interface between the as-sprayed coating and the substrate was mechanically bonded, while the interfacial bonding has been reported to become stronger metallurgically after the laser treatment [8]. Quite a few research results showed that laser treatments reduced the porosity and strengthened the coating adhesion in many coating/substrate systems [8][9][10][11][12][13]. Figure 3 shows the typical surface appearance of oxidized specimens prepared with and without the post-laser surface treatment.…”

Section: Oxidation Resistance Of Fecral-coated Tzm Alloy At 1100˝cmentioning

confidence: 99%

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Effect of Laser Surface Treatment on the Corrosion Behavior of FeCrAl-Coated TZM Alloy

Kim

Park

et al. 2016

Metals

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Abstract:The current study involves the coating of Titanium-Zirconium-Molybdenum (TZM) alloy with FeCrAl through plasma thermal spraying which proved effective in improving the oxidation resistance of the substrate. A post-laser surface melting treatment further enhanced the surface protection of the TZM alloy. Oxidation tests conducted at 1100˝C in air indicated that some Mo oxides were formed at the surface but a relatively small amount of weight reduction was observed for FeCrAl-coated TZM alloys up to 60 min of treatment. The post-laser surface treatment following the plasma thermal spray process apparently delayed the severe oxidation process and surface spalling of the alloy. It was suggested that the slow reduction in weight in the post-laser-treated specimen was related to fewer defects in the coating layer. It was also found that a surface reaction layer formed through the diffusion of Fe into the Mo alloy substrate at high temperature. The layer mainly consisted of Fe-saturated Mo and FeMo intermetallic compounds. In order to observe the corrosion behavior of the laser-treated alloy in 3.5% NaCl solution, electrochemical characteristics were also investigated. A proposed equivalent circuit model for the specimen indicated localized corrosion of coated alloy with some permeable defects in the coating layer.

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Section: Oxidation Resistance Of Fecral-coated Tzm Alloy At 1100˝cmentioning

confidence: 99%

“…It has been reported that relatively high porosity, as well as poor adhesion in various coating/substrate systems, could be modified by such post-treatments. The laser surface melting process could significantly enhance the adhesion of the metallic coating layer to a substrate and reduce microdefects in the coating [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Surface Treatment on the Corrosion Behavior of FeCrAl-Coated TZM Alloy

Kim

Park

et al. 2016

Metals

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“…The coatings deposited by thermal spraying usually present a mixture of lamellar-melted and halfmelted or non-melted particles, a certain content of oxides and/or internal porosity. In order to refine the structure and to improve the layers' adhesion to the substrate, the Stellite 6 (St6) coating was remelted by laser treatment [19], whereas the self-fluxing alloy (SF) was subsequently fused using an oxy-fuel torch.…”

Section: Materials and Processesmentioning

confidence: 99%

Experimental Study Regarding the Cavitation and Corrosion Resistance of Stellite 6 and Self-Fluxing Remelted Coatings

Ciubotariu

Secosan

Mărginean

et al. 2016

SV-JME

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“…How to find an effective adhesive way to improve the microstructure of the interface between substrate and coating has been the key problem to overcome in order to improve the quality of laser remelted layers [11]. According to the existing research, the laser process parameters can play a decisive role for the microstructure and properties of laser remelted coatings [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Scanning Speed on the Interface Behavior and Dendrite Growth of Laser Remelted Fe-Based Ni/WC Coatings

Zhao

Wang

2019

Coatings

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The flame sprayed Fe-based Ni/WC cermet coating was treated by laser remelting. The influence of scanning speeds on the interface behaviour was investigated. SEM, XRD and EDS were used to analyse the microstructure, phase composition and element distribution of the interface. The results showed that the interface of the coating contained holes and interlayer cracks and showed typical mechanical bonding features. The coatings mainly consisted of [Fe, Ni], Cr, WC, Cr7C3, Fe0.04Ni0.36, and other phases. After laser remelting, the coatings were smooth and dense due to the existence of well-developed dendrite structures and metallurgical bonding and could reach the optimal performance at 200 mm/s. New phases such as Fe2Si, Cr2Si, and W2C appeared in the remelted layers. With the increase of scanning speed, the half-peak height and average grain size became wider and smaller. At the same time, the measured dendrite spacing decreased with increasing scanning speed.

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Optimization of the laser remelting process for HVOF-sprayed Stellite 6 wear resistant coatings

Cited by 49 publications

References 10 publications

Effect of Laser Surface Treatment on the Corrosion Behavior of FeCrAl-Coated TZM Alloy

Effect of Laser Surface Treatment on the Corrosion Behavior of FeCrAl-Coated TZM Alloy

Experimental Study Regarding the Cavitation and Corrosion Resistance of Stellite 6 and Self-Fluxing Remelted Coatings

Effect of Scanning Speed on the Interface Behavior and Dendrite Growth of Laser Remelted Fe-Based Ni/WC Coatings

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