扫描速度对Ni基涂层组织性能的影响

Effect of Scanning Speed on Microstructure and Properties of Ni-Based Coatings

为探究扫描速度对Ni基涂层组织性能的影响,利用激光熔覆技术在不同扫描速度下制备涂层。利用XRD(X射线衍射)、维氏硬度计和摩擦试验机对涂层进行表征。发现涂层主要物相为[Fe Ni]和Fe。涂层的硬度都明显高于基材,10 mm/s扫描速度下涂层的均匀性最好,硬度达到了430 HV。在摩擦试验中,涂层耐磨性能先随着扫描速度增加而变强,在10 mm/s出现转折点,该涂层的磨损量为51.7 mg,而后涂层耐磨性能随着扫描速度增加而减弱。这一现象在硬度检测中也有相似表现。制备涂层时,只有合适的扫描速度才能制备出最优性能的涂层,本次试验中的最优扫描速度为10 mm/s。

In order to explore the effect of scanning speed on the microstructure and properties of Ni-based coatings,coatings were prepared by laser cladding technology at different scanning speeds.The coatings were characterized by XRD(X-ray dif-fraction),Vickers hardness tester and friction tester.The main phases of the coating were found to be[Fe Ni]and Fe.The hardness of the coating is obviously higher than that of the substrate.The uniformity of the coating is the best under the scan-ning speed of 10 mm/s,and the hardness reaches 430 HV.In the friction test,the wear resistance of the coating first increased with the increase of the scanning speed.At the turning point of 10 mm/s,the wear amount of the coating was 51.7 mg,and then the wear resistance of the coating decreased with the increase of the scanning speed.This phenomenon is also similar in hardness testing.The coating with the best performance can be prepared only by the appropriate scanning speed when preparing the coating.The optimal scanning speed in this experiment is 10 mm/s.