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

Abstract

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.

Enhanced mechanical properties of molybdenum-coated aluminium via laser cladding

“…The LR/LC coating presents the best wear resistance, which is approximately 40 times of the substrate and 5–6 times of HVOF coating according to the wear rate. The wear rate of the coatings is inversely proportional to their hardness values, which coincides with the well-known Archard's law [28–30].

Figure 8 Variations in coefficients of friction as a function of the sliding time (a), weight loss and wear rate (b) for the pure Al substrate, HVOF coating and LR/LC coating.

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“…The LR/LC coating presents the best wear resistance, which is approximately 40 times of the substrate and 5-6 times of HVOF coating according to the wear rate. The wear rate of the coatings is inversely proportional to their hardness values, which coincides with the well-known Archard's law [28][29][30].…”

Laser Cladding Strengthening Test on the Surface of Flatness Rollers

“…The hardness was measured every 0.25 mm along the radial direction from the surface of the roller to obtain the hardness change of the hardening layer. The friction coefficient, wear morphology and wear quantity are important parameters used to characterize the friction properties of materials [21][22][23]. The friction coefficient is the ratio of the friction moment between two contact surfaces to the positive pressure perpendicular to the surface and the radius of the grinding ring.…”

Формирование Состава И Характеристик Поверхности Хромоникелевой Стали 12Х18Н10Т При Лазерном Модифицировании В Слое Экспериментальной Легирующей Обмазки

“…Лазерное легирование в слое обмазки увеличивает многообразие возможных структур легированных слоев по сравнению с традиционными способами химико-термической обработки. Химическим составом слоя, его микротвердостью и однородностью можно управлять путем регулирования следующими основными параметрами обработки: типом и толщиной легирующей обмазки, фракционным составом используемого порошка, родом окружающей газовой среды, геометрией фокусировки лазерного излучения, мощностью и скоростью сканирования луча [4][5][6][7].…”