METALS AND METAL MARTIX COMPOSITES |
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Effect of Aluminum on Microstructure and Performance of Laser CladdingNi-based Alloy Coating |
JIANG Zhiqiu1, CHEN Quanzhi1, DONG Wanbing1, TONG Qing1, LI Weizhou1,2
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1 School of Resoures, Environment and Materials, Guangxi University, Nanning 530004 2 Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004 |
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Abstract In order to improve the performance of Ni based alloy coating 0wt%, 2wt%, 4wt%, 6wt% and 8wt% Al elements were added to Ni based alloy.The effects of Al addition on the wear resistance,high temperature oxidation resistance and thermal fatigue resistance of Ni based alloy were analyzed by SEM, XRD, friction and wear, high temperature oxidation and thermal shock test. The results show that, with the addition of aluminum could significantly improve the cladding formability, but when the aluminum content was more than 4wt%, the cracks appeared. By presetting the Ni based intermediate layer, the content of Al in the coatings could be increased from 4wt% to 8wt% at the premise of no crack defect. The microhardness experiment showed that when the aluminum content was 8wt%, the microhardness of the coating was 740HV, which was 1.85 times of that of the nickel-based coating. The tests of friction and wear showed that the wear resistance of the coating was best at the aluminum content of 6wt% which wear mass loss was 25% of the nickel-based coating. The high temperature oxidation results showed that the oxidation resistance of the coating with 8wt% aluminum content after 850 ℃/120 h oxidation was the best, the Al2O3, NiCr2O4, (Fe,Cr)2O3 and γ-Ni phases formed on the annealed coating, and the oxidation weight gain rate was 1.89 mg/cm2, which was only 35% of the nickel-based coating.
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Published: 31 May 2019
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Fund:This work was financially supported by the National Natural Science Foundation of China (51371059,51001032), Major Science and Technology Projects in Guangxi (AA18118030,AA17204100), the Natural Science Foundation of Guangxi (2014GXNSFCA118013,2016GXNSFDA380022), High Level Innovation Team and Outstanding Scholar Program in Guangxi Colleges (the second batch). |
About author:: Zhiqiu Jiangreceived his M.S. degree in December 2017 from Guangxi University, focusing on the research of laser cladding remanufacturing.Weizhou Li, Ph.D., professor. Outstanding scholar program in Guangxi colleges, Nanjing “321” Technology Entrepreneurship Talent. Mainly engaged in the research of corrosion and surface protection of materials. have been co-authored more than 90 academic papers inCorrosion Science, Applied Surface Science, Surface and Coatings Technology, Journal of Materials Research and other internationally important academic journals. |
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