Influence of buffer layer on surface and tribomechanical properties of laser cladded Stellite 6

Thawari, Nikhil; Gullipalli, Chaitanya; Katiyar, Jitendra Kumar; Gupta, T.V.K.

doi:10.1016/j.mseb.2020.114799

Cited by 41 publications

(9 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This type of fine-grained dendritic structure is related to the high cooling rates produced during laser cladding. The same type of microstructure was observed by Thawari et al [ 14 ]. According to them, laser cladding consists of primary dendrites of a Co-rich solid so9lution with Cr-rich interdendritic arrays of M 7 C 3 - and M 23 C 6 -type carbides and the area of W-rich carbides.…”

Section: Resultssupporting

confidence: 82%

“…The Stellite coating obtained by them had the same microhardness, which was 506 HV0.2/15. According to literature data, clad/cast Stellite™ 6 alloys are characterized by hardness in the range ∼450–550 HV [ 14 , 42 , 51 ]. On the other hand, Thawari et al [ 14 ] have suggested that the large difference in hardness in the zone between the substrate and the deposited layer is related to the increased Fe content [ 14 ].…”

Section: Resultsmentioning

confidence: 99%

“…According to literature data, clad/cast Stellite™ 6 alloys are characterized by hardness in the range ∼450–550 HV [ 14 , 42 , 51 ]. On the other hand, Thawari et al [ 14 ] have suggested that the large difference in hardness in the zone between the substrate and the deposited layer is related to the increased Fe content [ 14 ]. The content of the elements Co and Cr in Stellite 6 at the interface decreases due to the dilution effect.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the coatings require additional treatments to improve their properties [ 13 ]. The research on Stellite coatings has shown that laser deposition techniques are more effective methods of producing dense and crack-free Stellite 6 coatings [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterization of Cobalt-Based Stellite 6 Alloy Coating Fabricated by Laser-Engineered Net Shaping (LENS)

Durejko

Łazińska

2021

Materials

View full text Add to dashboard Cite

The results of microstructure and mechanical properties evaluation of a Stellite 6 (Co-6) alloy deposited on X22CrMoV12-1 substrate by the laser-engineered net shaping (LENSTM) technology are presented in this paper. The Stellite 6 alloy is widely used in industry due to its excellent wear resistance at elevated temperatures and corrosive environments. Specific properties of this alloy are useful in many applications, e.g., as protective coatings in steam turbine components. In this area, the main problems are related to the fabrication of coatings on complex-shaped parts, the low metallurgical quality of obtained coatings, and its insufficient adhesion to a substrate. The results of recently performed investigations proved that the LENS technology is one of the most effective manufacturing techniques of the Co-6 alloy coatings (especially deposited on complex-shaped turbine parts). The microstructural and phase analyses of obtained Stellite 6 coatings were carried out by light microscopy techniques and X-ray diffraction analysis. A chemical homogeneity of Co-6 based layers and a fluctuation of chemical composition in coating–substrate zone after the laser deposition were analyzed using an energy dispersive X-ray spectrometer coupled with scanning electron microscopy. The room temperature strength and ductility of the LENS processed layers were determined in static bending tests.

show abstract

Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of Cobalt-Based Stellite 6 Alloy Coating Fabricated by Laser-Engineered Net Shaping (LENS)

Durejko

Łazińska

2021

Materials

View full text Add to dashboard Cite

show abstract

“…4 It has various advantages like low dilution, high deposition rates, repeatability, metallurgical bond formation, etc. 5,6 Despite of that, the high rate of thermal cycles (≈10 5 k/s) induced in cladding lead to the generation of large thermal gradients (G) (due to melting). 7 As a result, residual stresses and out-of-plane distortions are developed in the components, 8 affecting geometrical accuracy, 9 mechanical, 10 and microstructural properties.…”

Section: Introductionmentioning

confidence: 99%

In-process monitoring of distortion and temperature in multi-layer laser cladding of Stellite 6 and Inconel 718 alloys

Thawari

Gullipalli

Katiyar

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

Self Cite

View full text Add to dashboard Cite

In laser cladding, the development of rapid heating and cooling cycles generates high residual stresses and thermal gradients that lead to induce unwanted distortion in the parts. The paper deals with online monitoring of temperatures and the associated distortions in multi-layer laser cladding using pyrometers and laser displacement sensors. The alloys deposited in the present work are Stellite 6 and Inconel 718, having similar thermo-mechanical properties. The results show that variation in thermal gradients due to rapid heating and cooling allows the material to expand and contract, generating substantial distortions. In the current investigations, Stellite 6 deposits generated 28%, 21%, 15% higher deflection at 12 mm/s, 16 mm/s, 20 mm/s scan speeds respectively; and 23%, 20%, 17% at 2400 W, 2900 W, 3400 W laser power compared to Inconel 718. Irrespective of the coating material, the second layer cladding induced 10% to 30% lower distortion than the first layer because of the reduction in temperature gradient. However, Inconel 718 clads measured 10% to 15% less melt pool temperatures than Stellite 6. The study reveals that different cladding materials deposited under similar process conditions have greater impact on distortion and temperature. At last, the investigations provide an optimum set of parameters to produce homogeneous cladding with moderate deflection and temperature for both the alloys.

show abstract

Effect of Laser Spot Diameter on Melt Pool Thermal History During Laser Cladding on Inconel 718 Coatings

Thawari

Gullipalli

Gupta

2022

Recent Trends in Design, Materials and Manufacturing

View full text Add to dashboard Cite

Influence of buffer layer on surface and tribomechanical properties of laser cladded Stellite 6

Cited by 41 publications

References 33 publications

Characterization of Cobalt-Based Stellite 6 Alloy Coating Fabricated by Laser-Engineered Net Shaping (LENS)

Characterization of Cobalt-Based Stellite 6 Alloy Coating Fabricated by Laser-Engineered Net Shaping (LENS)

In-process monitoring of distortion and temperature in multi-layer laser cladding of Stellite 6 and Inconel 718 alloys

Effect of Laser Spot Diameter on Melt Pool Thermal History During Laser Cladding on Inconel 718 Coatings

Contact Info

Product

Resources

About