中国激光, 2001, 28 (3): 275, 网络出版: 2006-08-10   

钛合金表面激光熔覆NiCrBSi-TiC复合涂层的组织研究

Study on Microstructure of Laser-clad NiCrBSi-TiC Coating on the Surface of Titanium Alloy
作者单位
哈尔滨工业大学材料科学与工程学院 哈尔滨 150001
摘要
采用CO2激光在TC4合金表面进行了NiCrBSi-TiC混合粉末的激光熔覆试验,利用扫描电镜和X射线衍射仪等对熔覆层的组织进行了分析,测试了熔覆层的显微硬度。结果表明,在优化工艺参数下可获得连续、均匀、无裂纹和气孔的熔覆层,熔覆层由TiC,γ-Ni,M23(CB)6,CrB,Ni3B等相组成。在激光熔覆过程中TiC颗粒边缘发生了溶解,冷却时以细小的枝晶形式析出,熔覆层显微硬度的平均值为Hv980。
Abstract
The clad coating ofNiCrBSi-TiC metal-ceramic powders on the surface of TC4 alloy was performed by CO2laser. By means of SEM and XRD, microstructure of the coating was investigated, andmicrohardness was measured. The experimental results show that the clad coating iscontinuous, homogeneous, poreless and crackless by optimizing the technical parameters.The phases of coating are composed of TiC, γ-Ni, M23(CB)6, CrB, Ni3B et al..The edges of TiC particles were dissoloved during laser heating, and the tiny dendrites ofTiC precipitated during cooling. The average hardness of coating is Hv980.

孙荣禄, 郭立新, 董尚利, 杨德庄. 钛合金表面激光熔覆NiCrBSi-TiC复合涂层的组织研究[J]. 中国激光, 2001, 28(3): 275. 孙荣禄, 郭立新, 董尚利, 杨德庄. Study on Microstructure of Laser-clad NiCrBSi-TiC Coating on the Surface of Titanium Alloy[J]. Chinese Journal of Lasers, 2001, 28(3): 275.

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