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5335 |
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Friday, June 09, 2017, Hall 28 2:40 PM Cold Gas Spraying IV |
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Robust corrosion protection of Mg alloys via in-situ shot-peening assistant cold spray |
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Chang-Jiu Li / Xi'an Jiaotong University, P.R. China Ying-Kang Wei* / Xi'an Jiaotong University, P.R. China Xiao-Tao Luo/ Xi'an Jiaotong University, Cheng-Xin Li/ Xi'an Jiaotong University, Chang-Jiu Li/ Xi'an Jiaotong University, |
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In this study, dense Al alloy coatings were deposited on ZK60-T5 Mg alloy substrate with commercially Al alloy powders blended with large sized stainless steel particles. The present work aims to study the effect of the coating deposited by in-situ shot-peening assisted cold spray on fatigue behavior of coated samples. Fatigue behavior of the coated samples was investigated through experimental tests. The size and shape distribution of powders and microstructural characteristics of coatings were characterized using scanning electron microscopy. In order to obtain the S-N diagrams, the coated samples on the substrate surfaces subjected todifferent treatments were tested for fatigue at load control conditions. X-ray diffraction technique was used to measure the residual stress distribution on both the substrate and the deposited coatings. The results indicate that the residual stress values of coating and substrate become larger by introducing in-situ tamping. Meanwhile, the residual stress distribution and surface roughness of coatings and substrate treatments have obvious effect on the initiation and propagation of fatigue crack. The fatigue strength of the ZK60 Mg alloy was significantly improved by coating dense Al alloy via in-situ shot-peening assisted cold spray. |