Effect of Post-annealing on the Microstructure and Mechanical Properties of Cold-sprayed Zn-Al Coati

• 作 者: LiangYongli[1]ZhangJunbao[2]YangXiaoping[2]
• 机 构: University of Science and Technology of China,Hefei 230026,China
• 出 处: 第十届中国钢铁年会暨第六届宝钢学术年会
• 发表日期: 2015年期

　　A compact Zn-Al coating was successfully deposited by cold spraying technique.The effect of annealing temperature on the microstructure,microhardness and wear properties of the coatings was explored.The typical morphology of as-sprayed coating was characterized as intensively deformed particles with elongated shape.After annealing treatment,more homogeneous microstructure was achieved at 250°C while an eutectoid lamellar structure started to form when annealing temperature was over 300°C.An obvious anneal-hardening effect was observed especially at the annealing temperature range of 200 to 350°C.The wear resistance of annealed coatings showed an opposite trend with the variation of their microhardness.The lowest friction coefficient was obtained after annealed at 250~300°C.Generally,The best wear properties with both relatively small weight loss rate and friction coefficient were achieved after annealing at 250°C for 120 min.