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首页> 外文会议>First International Symposium on High-Power Laser Macroprocessing, May 27-31, 2002, Osaka, Japan >Microstructure Characteristics And Properties of In-situ Formed TiC/Ni Based Alloy Composite Coating by Laser Cladding
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Microstructure Characteristics And Properties of In-situ Formed TiC/Ni Based Alloy Composite Coating by Laser Cladding

机译：激光熔覆原位形成TiC / Ni基合金复合涂层的组织性能

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摘要

Different weight ratio of nickel based alloy, titanium and graphite powders were mixed and then laser cladded onto carbon steel substrate to produce a surface metal matrix composite layer. The experimental results showed that the coating was uniform, continuous and free of cracks. An excellent bonding between the coating and the carbon steel substrate was ensured by the strong metallurgical interface. The microstructures of the coating were mainly composed of γ-Ni dendrite, N_(23)C_6), a small amount of CrB, and dispersed TiC particles, and the in-situ generated TiC_p/matrix interfaces were clean and free from deleterious surface reaction. The morphologies of TiC particles changed from the global, cluster to flower-like shape, the volume fraction of TiC_p and the microhardness gradually increased from the bottom to the top of the coating layer, and the maximum microhardness of the coating was about HV_(0.2)850, 3 times larger than that of steel substrate. The volume fraction of TiC particles increased with increasing of volume fraction of Ti and C too.
机译：将不同重量比的镍基合金，钛和石墨粉末混合，然后激光熔覆在碳钢基底上，以生产表面金属基体复合层。实验结果表明，涂​​层均匀，连续且无裂纹。坚固的冶金界面确保了涂层与碳钢基材之间的出色结合。涂层的微观结构主要由γ-Ni枝晶，N_（23）C_6），少量的CrB和分散的TiC颗粒组成，原位生成的TiC_p /基体界面干净，无有害的表面反应。 。 TiC颗粒的形貌由整体，簇状变为花状，TiC_p的体积分数和显微硬度从涂层的底部到顶部逐渐增加，涂层的最大显微硬度约为HV_（0.2） 850），是钢质基材的3倍。 TiC颗粒的体积分数也随着Ti和C的体积分数的增加而增加。

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