摘要
采用激光熔覆技术在H13钢表面制备出原位自生TiC颗粒增强Ni基复合涂层，利用扫描电镜、能谱仪和X射线衍射仪对熔覆层组织、成分和物相进行了分析，并测试了熔覆层显微硬度和耐磨性能。结果表明，激光熔覆层与基体呈良好的冶金结合，涂层中无裂纹、气孔等缺陷。涂层组织由γ-Ni、Cr7C，和TiC等相组成，原位自生TiC颗粒多呈菱形，尺寸在1—3μm之间，涂层显微硬度（800～1000HV0．2）明显高于基体的显微硬度（300HV0．2）。激光熔覆层中存在颗粒强化和细晶强化等多种强化作用，显著提高了H13钢的耐磨性能。
In situ formed of TiC particle reinforced Ni-base composite coating was prepared on H13 steel by laser cladding. The microstructure of the clad layer was characterized by SEM,EDX and XRD. The microhardness and wear resistance of the laser clad layer was examined. The results show that laser clad layer exhibits good metallurgical bonding with substrate under optimal processing parameters. The coating is uniform, continuous and free of pores and cracks. The microstructure of the coating is mainly composed of γ-Ni, Cr7 C3 and TiC particles. Most of TiC particles are rhombus with the size of 1 - 3μm. The microhardness of the coating （800 - 1000 HV0.2） is distinctly higher than that of the substrate（300 HV0.2）. The clad layer is reinforced by particles and grain-refining, resulting in greatly increasing in wear resistance comparing with H13 steel.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2009年第3期178-181,191,共5页
Transactions of Materials and Heat Treatment
基金
天津市高等学校科技发展基金计划项目(20060912)
关键词
激光熔覆
原位自生
复合涂层
显微组织
耐磨性能
laser cladding
in situ formation
composite coating
microstructure
wear resistance
