Influence of Gas Temperature on Microstructure and Properties of Cold Spray 304SS Coating

Xianming Meng1), Junbao Zhang2), Jie Zhao1), Yongli Liang2) and Yujun Zhang2) 1) School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China 2) Baosteel Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China

摘 要：In the present study, 304 stainless steel coatings were deposited on interstitial-free steel substrates by cold gas dynamic spray technology. The effect of gas temperature on microstructure, micro-hardness, cohesive strength, and electrochemical property of the coatings were investigated and compared. The results showed that increasing gas temperature had a great contribution to enhancing the bonding strength between the deposited particles and making the microstructure more density. Therefore, the porosity of the coatings decreased from 6%±0.5% to 2%±0.3%, and the tensile strength of the coatings increased from 56±4 MPa up to 73±3 MPa. In addition, the corrosion resistance of the coatings was also deeply influenced by process gas temperature. The corrosion kinetics of the coatings were affected by both of the plastic deformation of deposited particles and the porosity in the coatings.

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