摘要
通过Ni35+11%WC粉末来增强45钢齿轮的表面性能和延长使用寿命,为45钢齿轮表面改性提供参考。采用同步送粉法在45钢表面制备不同激光功率和扫描速度的涂层。通过对比不同涂层宏观形貌、几何尺寸和稀释率,测试不同扫描速度下的硬度,并利用XRD衍射仪、金相显微镜对其涂层和截面进行XRD物相和组织分析。结果表明:激光功率900 W、扫描速度2 mm/s,送粉速率1 r/min时,涂层出现柱状树枝晶、等轴晶组织,由γ-(Ni,Fe)固溶体、Mn_(7)C_(3)、Cr_(23)C_(6)、W_(2)C、W和Cr_(3)C_(2)组成;涂层与基体之间冶金结合良好,涂层最高硬度786.6 HV(2 N加载力),平均硬度737 HV,涂层平均硬度较基体提高了2.81倍。
Ni35+11%WC powder was used to enhance the surface performance and prolong the service life of 45 steel gear,providing reference for surface modification of 45 steel gear.Coatings were prepared on 45 steel surface with different laser power and scanning speed by synchronous powder feeding.By comparing the macroscopic morphology,geometry size and dilution rate of different coatings,the hardness under different scanning speeds was tested,and the XRD phase and microstructure of the coatings and sections were analyzed by XRD diffractometer and metallographic microscope.The results show that when the laser power was 900 W,the scanning speed was 2 mm/s,and the powder feeding rate was 1 r/min,the coating appeared columnar dendrites and isometric organization composed ofγ-(Ni,Fe)solid solution,Mn_(7)C_(3),Cr_(23)C_(6),W_(2)C,W and Cr_(3)C_(2) phase composition.The metallurgical combination between the coating and the substrate was good,The highest hardness of the coating was 786.6 HV(2 N loading force),and the average hardness was 737 HV,The average hardness of the coating was 2.81 times higher than that of the substrate.
作者
刘伟斌
李新梅
井振宇
张晨阳
杨现臣
Liu Weibin;Li Xinmei;Jing Zhenyu;Zhang Chenyang;Yang Xianchen(School of Mechanical Engineering,Xinjiang University,Urumqi,Xinjiang 830017,China)
出处
《应用激光》
CSCD
北大核心
2021年第5期961-967,共7页
Applied Laser
基金
国家自然科学基金(51865055)
天山英才计划资助项目(201720025)。
