Effect of Annealing Treatment on Microstructure and Mechanical Properties of CrAlN Hard Coating
Author of the article:WANG Mengting;WANG Jin;WANG Yongqiang;MA Dayan;LI Hao;LIU Qi
Author's Workplace：School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520,China;School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China
Key Words：CrAlN annealing treatment structure mechanical properties tribological properties
Abstract：The CrAlN coating was prepared on the surface of high speed steel by multi-arc ion plating and annealed at different temperatures.The effects of heat treatment on the microstructure,mechanical properties and friction and wear properties of the coating were investigated by scratch tester,hardness tester,scanning electron microscope(SEM),X-ray diffraction(XRD)and friction and wear tester(UMT-3).The results show that after annealing,the hardness of the coating decreases,the roughness increases,the Cr and Al elements decrease,and the O element content increases.The grain coarsening occurred after annealing.The CrAlN coating annealed at 700℃ has higher hardness,excellent binding force and the lowest friction coefficient.The coating has excellent wear resistance and friction reduction performance and high temperature stability.After annealing,the wear mechanism of coating changes from abrasive wear to abrasive wear and adhesion wear.
