The microstructural evolution and wear properties of Ni60/high-aluminum bronze composite coatings with directional structure
来源期刊:Rare Metals2021年第4期
论文作者:Xiao-Tian Yang Xiu-Qian Li Qiang-Bin Yang Jun-Ling Duan Xiao-Yue Fu Heng-Li Wei Wen-Sheng Li
文章页码:952 - 960
摘 要:The directional structure of Ni60/high-aluminum bronze composite coating was formed using induction remelting and forced cooling.The microstructural evolution and the characteristics of interface growth were studied.The results showed that the remelted coating formed metallurgical bonding with the substrate.The micros tructures changed from plane crystal to dendrite,cellular dendrite,fine cellular dendrite,and then to dendrite again with the increase in the cooling rate.The crystal grew along the heat flow direction and had(111) and(200)preferred orientations when the cooling rate was 1.886 ml-min-1.mm-2.The plane crystal,dendrite and cellular dendrite were mainly composed of compounds and solid solutions with Ni,Fe and Cu,and they were surrounded by strengthening phases composed of Cr,C and B.The grain boundary of directional structure coatings showed the characteristic of regular eutectic growth,but grain boundary of remelted coating presented characteristic of divorced eutectic growth.The wear resistance of directional structure coatings is better than that of remelted coating.
Xiao-Tian Yang1,2,Xiu-Qian Li1,Qiang-Bin Yang3,Jun-Ling Duan1,Xiao-Yue Fu1,4,Heng-Li Wei1,Wen-Sheng Li1
1. College of Materials Science and Engineering,State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology2. Wenzhou Engineering Institute of Pump & Valve,Lanzhou University of Technology3. Chongqing Key Laboratory of Environmental Materials & Remediation Technologies,College of Chemistry & Environmental Engineering,Chongqing University of Arts and Sciences4. Department of Material and Chemical Engineering,College of Technology and Engineering,Lanzhou University of Technology
摘 要:The directional structure of Ni60/high-aluminum bronze composite coating was formed using induction remelting and forced cooling.The microstructural evolution and the characteristics of interface growth were studied.The results showed that the remelted coating formed metallurgical bonding with the substrate.The micros tructures changed from plane crystal to dendrite,cellular dendrite,fine cellular dendrite,and then to dendrite again with the increase in the cooling rate.The crystal grew along the heat flow direction and had(111) and(200)preferred orientations when the cooling rate was 1.886 ml-min-1.mm-2.The plane crystal,dendrite and cellular dendrite were mainly composed of compounds and solid solutions with Ni,Fe and Cu,and they were surrounded by strengthening phases composed of Cr,C and B.The grain boundary of directional structure coatings showed the characteristic of regular eutectic growth,but grain boundary of remelted coating presented characteristic of divorced eutectic growth.The wear resistance of directional structure coatings is better than that of remelted coating.
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