(1. 陆军装甲兵学院装备再制造技术国防科技重点实验室，北京 100072；
2. 河北京津冀再制造产业技术研究有限公司，河间 062450；
3. 北京睿曼科技有限公司，北京100043)
摘 要: 以石墨和Ti粉为原料，在Ti6Al4V基体表面感应熔覆原位合成了TiC增强Ti基复合涂层，研究了预置反应物粉末中C含量和熔覆工艺参数对复合涂层微观组织演变、物相组成、增强体形态与分布、界面结合行为以及显微硬度的影响规律。结果表明，复合涂层内部原位自生TiC增强体分布均匀，与Ti基质相结合紧密、界面洁净，TiC增强体的最终形态与分布主要受涂层成分、凝固过程和自身晶体结构的影响。随着石墨含量升高，TiC增强体形态逐渐由短纤维状演变为等轴晶状，尺寸和体积分数以及涂层显微硬度逐渐增大。随着热输入量增加，TiC尺寸逐渐增大，界面过渡区宽度及基体热影响也随之增加。
关键字: 原位合成；碳化钛；感应熔覆；显微组织；钛基复合材料
（1. National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China;
2. Hebei Jingjinji Institute of Remanufacturing Industry & Technology Co., Ltd., Hejian 062450, China;
3. Beijing Ruiman Technologies Co., Ltd., Beijing 100043, China）
Abstract:TiC/Ti composite coating was in-situ synthesized on Ti6Al4V substrate using the powder mixture of Ti and graphite by induction cladding method. The effects of chemical composition of raw materials and processing parameter on the microstructure, phase structure, morphology and distribution of the reinforcements, interface bonding behavior and microhardness of the composite coating were studied. The results indicate that fine TiC reinforcements, with a clean interface and tight bond with the matrix, are in-situ formed and uniformly dispersed in the coating. The morphology and distribution of TiC reinforcements in coating are mainly influenced by the composition, solidification process and crystal structure of TiC. With the increase of graphite content, the morphology of the in-situ TiC gradually evolves from short fiber to equiaxed crystal, and its size and volume fraction and the coating hardness increase. With the increase of heat input, the size of TiC increases, and the width of the interface transition region and the heat effect on the substrate also increase.
Key words: in-situ synthesis; TiC; induction cladding; microstructure; Ti matrix composite
