Microstructure and Water Erosion Resistance Property of Stellite6 Coating by Laser Cladding on 17-4PH Stainless Steel Surface

Chao, 任超 Ren; Li, Zhuguo; Da, 疏达 Shu; Wenyu, 赵文雨 Zhao; Ren-jie, 杨仁杰 Yang; Peng, 王朋 Wang; Jianshui, 叶建水 Ye

doi:10.3788/cjl201744.0402010

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“…At this point, heat could be dissipated through the substrate and free surface, and due to the stirring effect of laser and the heterogeneous nucleation caused by unmelted particles in the molten pool, dendritic orientations are disorder. Because of the small size of the alloying molten pool, heat is mainly dissipated by the cold matrix, which leads to the orientations of dendrites inside layer are still approximately perpendicular to the fusion line [13,30].…”

Section: Resultsmentioning

confidence: 99%

“…Ren et al used laser cladding technology to prepare stellite6 coating with hardness up to 561 HV on the surface of 17-4PH stainless steel. After water erosion tests, stellite6 coating basically maintained its original morphology, which indicated the improvement of wear resistance and corrosion resistance [13]. However, difference of thermal expansion coefficients between the cladding layer and substrate makes the cladding layer prone to cracking and breaking and thus shorten the life of coatings [14-16].…”

Section: Introductionmentioning

confidence: 99%

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Laser surface alloying with carbon on 15-5PH steel for improved wear resistance

Zhang

Wang

Chen

et al. 2020

Surface Engineering

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Supersaturated carbon alloying layer was prepared on the surface of 15-5PH stainless steel using laser surface alloying technology with carbon powders as alloying materials. XRD, optical microscope, scanning electron microscope, microhardness test and wear test were performed to characterize the microstructure and wear resistance of substrate and alloying layer. Results showed that the alloying layer was rapidly solidified dendritic structure with phase compositions of high-carbon austenite and a small amount of martensite and M 7 C 3 carbides. Microhardness of the alloying layer reached about 510 HV, which was 38.7% higher than that of the as-deposited substrate (375 HV). Carbon supersaturated solid solution strengthening and microstructure refinement strengthening were the main reasons for a substantial increase in alloying layer microhardness. After direct aging treatment, microhardness of the alloying layer further increased to nearly 640 HV. Wear test results showed that the mass loss of the aging alloying layer was about 60% lower than that of the aging substrate, which meant significantly improvement of wear resistance.

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Section: Resultsmentioning

confidence: 99%