Laser melting of HVOF coating: Effect of base material on residual stress formation

Arif, Abul Fazal M.; Yilbaş, Bekir Sami

doi:10.1179/174329408x326876

Cited by 5 publications

(4 citation statements)

References 14 publications

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“…For laser cladding and welding, meshing is adjusted between iterations in the time domain to address the change in the geometry of the meltpool, usually represented with an isotherm [175,[184][185][186][187]. In the cases of laser forming, the mesh elements are usually refreshed and regenerated after each sequence of laser movement, to accommodate the deformation induced [188][189][190][191][192][193][194][195].…”

Section: Beam Shaping Technologies and Their Applicationsmentioning

confidence: 99%

A predictive thermal dynamic model for parameter generation in the laser assisted direct write process

Shang¹,

Fearon²,

Wellburn³

et al. 2011

J. Phys. D: Appl. Phys.

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Declaration I hereby declare that this submission is my own work and that, to the best of my knowledge and belief, it contains no material previously published or written by another person nor material which to a substantial extent has been accepted for the award of any other degree or diploma of the University or other institute of higher learning, except where due acknowledgment has been made in the text: Signature Name: Shuo Shang Date: Friday 17 th August 2012 .

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Section: Beam Shaping Technologies and Their Applicationsmentioning

confidence: 99%

A predictive thermal dynamic model for parameter generation in the laser assisted direct write process

Shang¹,

Fearon²,

Wellburn³

et al. 2011

J. Phys. D: Appl. Phys.

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“…It would be fitting to mention here more recent laser heating applications by Arif and Yilbas [42][43][44] where thermal stress fields are analysed in laser cutting and laser treatment of high-velocity oxy-fuel (HVOF) coatings. In reference [42], the authors have simulated laser cutting and computed temperature and thermal stress fields in the vicinity of laser cut edges for various substrate materials such as steel, Inconel 625, and Ti-6Al-4V alloy.…”

Section: Modelling Of Residual Stresses In Coatingsmentioning

confidence: 99%

“…In reference [42], the authors have simulated laser cutting and computed temperature and thermal stress fields in the vicinity of laser cut edges for various substrate materials such as steel, Inconel 625, and Ti-6Al-4V alloy. In references [43] and [44], the laser melting of HVOF coatings sprayed on Ti-6Al-4V alloy is considered and the residual stress levels in the coating and the coating base material interface are predicted using the finite-element method. It should be noted that all these applications require an elastoplastic analysis, which leads to plastic deformation in the heated region and hence to the residual stress fields.…”

Section: Modelling Of Residual Stresses In Coatingsmentioning

confidence: 99%

Understanding the effect of non-conventional laser beam geometry on material processing by finite-element modelling

Sheikh

2010

Proceedings of the Institution of Mechanical Engineers, Part C:

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The temperature distribution inside the material is of prime importance in laser material processing. Optimization of laser processes requires control over this temperature distribution in order to achieve the desired outcomes by manipulating heating/cooling rates and thermal gradients. So far, most of the laser material processing has been carried out by using circular and rectangular beam geometries with variations in laser power, spot size, and scanning speed. However, variations in these parameters are often limited by other processing conditions and it is not always possible to change, e.g. the scanning speed or laser power. One possible method of varying the temperature distribution, and hence the heating/cooling rates and thermal gradients, is to modify the geometry of laser beams. It has been shown that non-conventional laser beam geometries can be effectively employed for laser processes such as surface heating, transformation hardening, forming, melting of metallic materials, and laser cutting. This article presents a review of non-conventional laser beam geometries that can be utilized to improve and/or optimize many laser material processes. Some examples of laser material processing that have been previously studied in detail are briefly discussed.

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“…Their findings revealed that Inconel 625 coating failed to protect the substrate material after 20 hours of testing due to inadequate coating conditions. HVOF coating and residual stress formation was investigated by Arif et al (2009). They showed that the base material significantly influenced the residual stress levels formed at the coating-substrate interface.…”

Section: Introductionmentioning

confidence: 99%

HVOF Diamalloy 2002 coating of steel surface: electrochemical corrosion resistance

Yilbaş

Toor

Patel

et al. 2015

Industrial Lubrication and Tribology

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Purpose -The purpose of this paper is to investigate the corrosion resistance of high velocity oxy-fuel (HVOF)-sprayed Diamalloy 2002 coating on carbon steel. The coating microstructure is examined in line with the corrosion resistance. Design/methodology/approach -HVOF spraying of coating is achieved, and the coating response to electrolytic solution is measured experimentally in terms of corrosion resistance. Findings -HVOF coating improves the corrosion resistance of the substrate such that the corrosion rate of the substrate is 7.1 mpy and the coating results in 4.5 mpy. However, presence of deep pit sites at the surface suggests the occurrence of preferential corrosion around the splat boundaries. In addition, closely spaced surface texture peaks act as crevice corrosion centers at the surface while initiating the formation of deep pit sites. Research limitations/implications -This study is limited by experimental investigations. In future, it may be extended to include model studies.Practical implications -The findings of this study are very useful for those working in the coating industry. However, HVOF coating is limited to high temperature protection in harsh environments. Social implications -It is useful for the power industry, particularly for gas turbines. Originality/value -It is an original work and describes the corrosion resistance of the coating surface. It is found that the coating improved the corrosion resistance of the steel surface.

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Laser melting of HVOF coating: Effect of base material on residual stress formation

Cited by 5 publications

References 14 publications

A predictive thermal dynamic model for parameter generation in the laser assisted direct write process

A predictive thermal dynamic model for parameter generation in the laser assisted direct write process

Understanding the effect of non-conventional laser beam geometry on material processing by finite-element modelling

HVOF Diamalloy 2002 coating of steel surface: electrochemical corrosion resistance

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