Cracking mechanisms and prevention of Stellite 6# surface layer built by laser cladding during thermal cyclic process

Li, Xue; Xiong, Jiankun; Ou, Wuxing; Yuan, Xinjian; Zhang, Le; Xu, Jian; Yang, Jianping; Jiao, Yingjun; Zhang, Haibo; Chen, Zhuo; Li, Ting; Sheng, Guangmin

doi:10.1016/j.ijfatigue.2022.107439

Cited by 12 publications

(2 citation statements)

References 19 publications

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“…The analysis revealed that the cracks contain high peaks of inclusions, C, Fe, Si, and W, indicating the likely presence of carbides and silicides aggregation in this region. Moreover, the surface scanning results near the cracks indicate an enrichment of the C element, with a significant number of MC carbides forming around the cracks [14]. These carbide precipitates contribute to the cracking of the coating, intensifying stress concentration and further promoting coating failure.…”

Section: Elemental Analysis Of Inclusions and Precipitates In Cracksmentioning

confidence: 98%

Optimization and Wear Performance Analysis of Laser-Cladded WC-Fe-Based Coating

Yin,

Cao,

Zhan

et al. 2023

Preprint

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In this study, a WC-Fe-based coating was prepared on 45 steel substrate utilizing laser clad-ding technology. To optimize the composition of the Fe-based alloy powder, a thorough anal-ysis of the cracks observed during the formation of the cladding layer was conducted. Ele-mental control of the WC-Fe-based alloy powder was employed to mitigate issues such as porosity and slagging, consequently reducing susceptibility to cracking. The optimized WC-Fe-based alloy coating exhibited enhanced wear and abrasion resistance when compared to the widely used Ni45 coating. Microstructural investigations revealed that both coatings fea-tured dendrites, cellular crystals, and equiaxial crystals. However, the WC-Fe coating dis-played a finer and denser microstructure, highlighting its superior characteristics. The hard-ness and abrasion resistance tests demonstrated exceptional performance of the WC-Fe-based coatings, boasting approximately three times the substrate's hardness and a wear rate approx-imately seven times lower than that of the substrate. The coefficient of friction for WC-Fe-based coatings remained consistently stable at approximately 0.4, indicative of remarkable friction reduction and abrasion resistance.

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Section: Elemental Analysis Of Inclusions and Precipitates In Cracksmentioning

confidence: 98%

Optimization and Wear Performance Analysis of Laser-Cladded WC-Fe-Based Coating

Yin,

Cao,

Zhan

et al. 2023

Preprint

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“…Co-based self-fluxing alloy powder has been widely used in the engineering field because of its excellent properties, such as corrosion resistance, wear resistance, and hightemperature oxidation resistance [5]. Yun et al [6] prepared a Co-based cladding coating on the surface of Inva alloy, a low expansion alloy, using laser cladding, and the research showed that the wear resistance and oxidation resistance of the surface of Inva alloy were significantly improved.…”

Section: Introductionmentioning

confidence: 99%

Effect of Y2O3 Content on Microstructure and Wear Resistance of Laser Cladding Layer of Stellite-6 Alloy

Xia,

Feng,

2024

Processes

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Laser cladding technology is an effective surface modification technique. In order to prepare coating with excellent properties on the surface of the cold heading die punch, stellite-6 cladding coating with different proportions of Y2O3 was prepared on the surface of W6Mo5Cr4V2 high-speed steel using laser cladding technology in this paper. The effects of different Y2O3 contents on the macroscopic morphology, microstructure, phase analysis, microhardness, and tribological properties of the stellite-6 coatings were investigated. It was determined that the optimal Y2O3 content for the stellite-6 powder was 2%. The results showed that the coating with 2%Y2O3 had the least number of pores and cracks and exhibited good surface flatness when joined. The microstructure became finer and denser, composed mainly of branch, cellular, equiaxed, and columnar grains. The coating consisted mainly of γ-Co, Fe-Cr, and Co3Fe7 strengthening phases, indicating good metallurgical bonding between the coating and the substrate. The average microhardness reached 539 HV when 2%Y2O3 was added, a 15.2% increase compared with the unmodified multilayer coating. The friction coefficient of the clad layer was 0.356, a 21.8% improvement over the unmodified stellite-6 coating. The average worn area of the cross-section was 3398.35 μm2, a reduction of approximately 27.8% compared with the unmodified stellite-6 clad layer. The wear surface primarily exhibited abrasive wear, with fewer cavities and a smoother surface.

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