Effect of magnetic field on crack control of Co-based alloy laser cladding

Qi, Kang; Yang, Yong; Sun, Renjuan; Hu, Guofang; Lu, Xin; Li, Jindong; Liang, Wanxu; Jin, Kang; Li, Xiong

doi:10.1016/j.optlastec.2021.107129

Cited by 52 publications

(12 citation statements)

References 28 publications

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“…LC possui inúmeras vantagens em relação aos processos convencionais de revestimento, pois é capaz de produzir um revestimento melhor, com diluição mínima, distorção mínima e um melhor acabamento superficial (Toyserkani et al, 2004). No entanto, defeitos, rachaduras e poros têm sido um grande problema, restringindo o desenvolvimento desta tecnologia (Qi et al, 2021). Em relação às trincas, as altas tensões térmicas induzidas durante a deposição são o fator princiapl que favorece sua ocorrência nos revestimentos durante e logo após o processamento.…”

Section: Processo De Laser Claddingunclassified

“…A ocorrência de trincas na camada de revestimento do LC pode ser atribuída, principalmente, à incompatibilidade propriedades mecânicas e térmicas (coeficiente de expansão térmica e módulo de elasticidade) entre o material de revestimento e o substrato. Essa incompatibilidade aliada a grandes taxas de resfriamento gera elevadas tensões térmicas durante o revestimento a laser (Qi et al, 2021). necessário garantir que, durante o processo de LC, as tensões térmicas máximas geradas no revestimento não ultrapassem o limite de resistência à tração do material de deposição.…”

Section: Formação De Trincas Em Revestimen-tos De Laser Claddingunclassified

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Contribuição Do Pré-Aquecimento Do Substrato Na Prevenção De Trincas Em Revestimentos Gerados Por Laser Cladding

Lorenzoni¹,

Antonialli²

2021

Anais - V Workshop De Pesquisa Em Manufatura

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Section: Processo De Laser Claddingunclassified

Section: Formação De Trincas Em Revestimen-tos De Laser Claddingunclassified

Contribuição Do Pré-Aquecimento Do Substrato Na Prevenção De Trincas Em Revestimentos Gerados Por Laser Cladding

Lorenzoni¹,

Antonialli²

2021

Anais - V Workshop De Pesquisa Em Manufatura

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“…The in situ synthesis is a method that improves the performance of cladding layers by adding elements to react in the molten pool to generate target reinforcements. The in situ synthesized reinforcements have received extensive attention recently [ 1 , 2 , 6 ], as they significantly improve the hardness, wear resistance, and corrosion resistance of the substrate [ 7 , 8 ]. However, defects such as pores and cracks are easily formed in coatings due to the rapid cooling and heating of laser cladding [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Properties of NbC-Reinforced Ni-Based Coatings Synthesized In Situ by Ultrasonic Vibration-Assisted Laser Cladding

et al. 2023

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This paper aims to explore the mechanism of an ultrasonic applied field on the microstructures and properties of coatings, and clarify the evolution of the molten pool under different ultrasonic frequencies. The Taguchi experimental design method was adopted in this paper. NbC-reinforced Ni-based coatings were in situ synthesized by laser cladding to investigate the effects of ultrasonic vibration process parameters on the microstructure, pore area, microhardness, and wear resistance of the cladding layer. The results show that the pore area decreases first and then increases as ultrasonic power increases from 600 to 900 W and ultrasonic frequency from 23 to 40 kHz. On the contrary, the hardness and wear resistance increase at first and then decrease. The pore area is minimized at 800 W ultrasonic power and 32 kHz ultrasonic frequency, and the hardness is maximized at 600 W ultrasonic power and 40 kHz ultrasonic frequency. Meanwhile, the highest wear resistance can be obtained when ultrasonic power is 700 W and ultrasonic frequency is 32 kHz. Based on the phase structure analysis, the cladding layer mainly consists of FeNi3, NbC, B4C, and CrB2. Ultrasonic vibration will not change the phase composition of the layer. Combined with the varying G/R value and cooling rate, the reasons for the change in grain morphology in different areas were analyzed to reveal the evolution mechanism of the molten pool under the influence of ultrasound.

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“…The selection of appropriate laser-clad materials can significantly improve their erosion resistance [5], corrosion resistance [6,7], and wear resistance [8]. However, defects such as crack and pores in the cladding layer are a major problem restricting its industrial use [9], especially when cladding hard wear-resistant coatings such as Ni-base alloy [10,11] and Ni-base superalloy [12,13] with a high γ' volume fraction are more likely to cause transverse penetration cracks and solidification cracking of the coating. The causes of crack formation in the cladding layer are mainly related to the high thermal stress caused by laser rapid heating and fast cooling, some hard phases exist in the coating to increase the brittleness and segregation of some low melting point intermetallic compounds at the grain boundary [9].…”

Section: Introductionmentioning

confidence: 99%

Laser Cladding of Ni-Co-W Composite Coating on Stainless Steel to Enhance Wear Resistance

Zhang

Zhang²

2022

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Ni-Co-W composite coatings modified by different contents of Co-based alloy powder in the Ni-based alloy with 35 wt.% WC (Ni35WC) were deposited on stainless steel by laser cladding. The influence of compositional and microstructural modification on the wear properties has been comparatively investigated by XRD, SEM, and EDS techniques. It was found that the austenite dendrites in the modified coating adding 50 wt.% Co-based alloy were refined and a lot of Cr23C6 or M23(C, B)6 compounds with fine lamellar feature were formed around austenitic grain boundaries or in the intergranular regions. The contribution of element Co to the modification of Ni35WC coating is that it cannot only promote the formation of more hard compounds to refine austenite grains, but also refine the size of precipitates, and change the phase type of eutectic structure as a result of disappeared Cr boride brittle phases. A noticeable improvement in wear resistance is obtained in the Ni35WC coating with 50 wt.% Co-based alloy, which makes the wear rate decreased by about 53 % and 30% by comparison to that of the substrate and the Ni35WC coating, respectively. It is suggested that the improvement is closely related to the composite coating being strengthened owing to the increase of coating hardness, formation of a fine-grained microstructure caused by Co, and fine hard precipitate phases in the eutectic structure.

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Effect of magnetic field on crack control of Co-based alloy laser cladding

Cited by 52 publications

References 28 publications

Contribuição Do Pré-Aquecimento Do Substrato Na Prevenção De Trincas Em Revestimentos Gerados Por Laser Cladding

Contribuição Do Pré-Aquecimento Do Substrato Na Prevenção De Trincas Em Revestimentos Gerados Por Laser Cladding

Microstructures and Properties of NbC-Reinforced Ni-Based Coatings Synthesized In Situ by Ultrasonic Vibration-Assisted Laser Cladding

Laser Cladding of Ni-Co-W Composite Coating on Stainless Steel to Enhance Wear Resistance

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