中国激光, 2008, 35 (11): 1756, 网络出版: 2008-11-17
Ti-6Al-4V表面激光熔覆钛基复合涂层的微观组织及形成机制
Microstructure and formation mechanism of titanium matrix composites coating on Ti-6Al-4V by laser cladding
在Ti-6Al-4V基体表面分别激光熔覆Ti+Cr3C2 和Ti+TiB2 利用显微硬度计测量了显微硬度。结果表明 在Ti+Cr3C2涂层中 Cr3C2颗粒溶解 析出在涂层顶部为树枝晶 底部为球形颗粒的TiC。在Ti+TiB2涂层中 在激光辐照下大部分TiB2溶解 形成细小和粗大针状的TiB 在涂层底部发现少量未溶的不规则TiB2颗粒。Ti+Cr3C2 是Ti-6Al-4V基体的2~3倍。 lasertechnique lasercladding compositescoating microstructure mechanism HV800~HV1050
摘要
激光技术; 激光熔覆; 复合涂层; 微观组织; 机制
Abstract
Titanium matrix composite coatings were fabricated on Ti-6Al-4V substrate by laser cladding using powder mixtures of Ti+Cr3 C2 and Ti+TiB2 , respectively. The chemical compositions and microstructures of the coatings were analyzed using scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). Microhardness was measured by a microhardness tester. The results showed that Cr3 C2 particles were dissolved and deposited to form dendritic TiC in the upper section and spherical grain TiC in the bottom of Cr3 C2 +Ti coating. Most of TiB2 was dissolved in the molten pool by laser irradiation, then formed TiB with fine needles and coarse needles in the TiB2 +Ti coating. A few quasi-melted TiB2 particles with irregular shape at the bottom of the coating were observed. The average microhardnesses were approximately HV850—HV1000, HV800—HV1050 in the Cr3 C2 +Ti and TiB2 +Ti coating, respectively, which were 2~3 times higher than that of Ti-6Al-4V substrate.
牛伟, 孙荣禄, 雷贻文, 郭喜华. Ti-6Al-4V表面激光熔覆钛基复合涂层的微观组织及形成机制[J]. 中国激光, 2008, 35(11): 1756. Wei Niu, Ronglu Sun, Yiwen Lei, Xihua Guo. Microstructure and formation mechanism of titanium matrix composites coating on Ti-6Al-4V by laser cladding[J]. Chinese Journal of Lasers, 2008, 35(11): 1756.