Effect of thermal cycle shocking on microstructure and mechanical properties of Stellite 12 (Co-29Cr-2.3C-3W) cobalt based alloy

Cao, Rui; Zhang, H.Y.; Liu, G.H.; Che, Hongyan; Chen, J.H.

doi:10.1016/j.msea.2017.12.057

Cited by 9 publications

(2 citation statements)

References 16 publications

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“…For the sample with the Co-6 coating produced by using the LENS technique, a decrease in ductility of about 30% was detected, at the statistically comparable bending strength relative to a reference sample (sample “0”). According to the authors of [ 52 ], the flexure strength of cobalt-based alloy prepared by the hot isostatic pressing process is 2224 MPa.…”

Section: Resultsmentioning

confidence: 99%

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

Durejko

Łazińska

2021

Materials

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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.

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Section: Resultsmentioning

confidence: 99%

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

Durejko

Łazińska

2021

Materials

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“…Соотношение в пакете между атомными массами никеля и алюминия соответствует Ni 2 Al-фазе. Изменение структуры исследуемого металла под влиянием поперечных перемещений дуги оказало влияние на его твердость, которая в зависимости от частоты колебаний варьируется в диапазоне [27][28][29][30][31][32][33][34][35]что после ~50 теплосмен (рис. 5) [28]. Однако с учетом погрешности измерения можно полагать, что исследуемый сплав сопоставим по стойкости к окислению со сплавом «Stoodite 6».…”

Section: техника формирования техника формирования наплавленных покры...unclassified

Transformation of the nickel aluminide alloy structure through the application of a heat-resistant coating using oscillation electrode surfacing

Zorin,

Lysak,

Kharlamov

et al. 2023

Izv. VUZ. Poroshk. Met.

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This study considers the formation of an alloyed nickel aluminide structure through automatic electric arc surfacing employing an oscillating electrode composed of composite wire. The arc transversely traverses the weld pool surface at a frequency denoted as f. In comparison to conventional surfacing techniques, this process either displaces the crystallization front alongside the weld pool (at f  = 1.3 Hz) or stabilizes it (at f  ≥ 2 Hz) throughout the cross-sectional area of the coating layer. We have conducted an investigation into the evolution of alloy structures resulting from surfacing. Notably, we have observed that the regions with concentrations of eutectic nickel-aluminum are particularly susceptible to structural alterations. The formation of particle clusters, which is contingent upon heat dissipation conditions near the crystallization front, leads to the development of layered texture regions. Our findings reveal that following 50 thermal cycles (heating to 1100 °C, cooling to 25 °C), the alloy's hardness becomes independent of subsequent thermal cycles, consistently maintaining a level 34–35 HRC. The highest resistance of the surfaced metal to thermal fatigue cracks is achieved when its structure exhibits an optimal γ-solid solution (relatively ductile) to nickel-aluminum cooling martensite ratio, corresponding to the Ni2Al phase. The thermal conditions necessary for producing such a structure are elucidated by the gradual cooling of the crystallized metal from elevated temperatures when f  ≥ 2.8 Hz. An analysis of changes in oxidative wear, estimated by mass loss, during thermal fatigue tests conducted at a metal heating temperature of 1100 °C revealed the superiority of the studied alloy over industrial alloys based on nickel and cobalt.

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Mysterious failure in load-free superalloys under repeated thermal shocks

2020

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Effect of thermal cycle shocking on microstructure and mechanical properties of Stellite 12 (Co-29Cr-2.3C-3W) cobalt based alloy

Cited by 9 publications

References 16 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)

Transformation of the nickel aluminide alloy structure through the application of a heat-resistant coating using oscillation electrode surfacing

Mysterious failure in load-free superalloys under repeated thermal shocks

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