激光熔覆原位生成TiC陶瓷颗粒的形貌研究

Morphology Study of TiC Ceramic Particles Generated In-situ by Laser Cladding

基于Materials Studio软件对TiC陶瓷颗粒的生长机制进行仿真分析,对其形貌进行合理预测。为了验证仿真结果的准确性,在H13钢基体上制备了(Ti+C)/Ni60激光熔覆层。利用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、显微硬度计等对涂层中TiC的形貌以及涂层的物相和硬度进行了检测分析。结果表明,仿真预测得到的TiC陶瓷颗粒在形貌上和实验结果具有较高的一致性,TiC颗粒平面形状以正方形、菱形等四边形为主,在熔覆过程中,熔覆环境、物相生长抑制、固液相作用是导致预测形貌和实际形貌存在一定差异的主要原因。原位制备的TiC陶瓷颗粒在涂层中分布均匀,整个涂层的显微硬度得到明显提高。

Based on Materials Studio software,a simulation analysis of the growth mechanism of TiC cera-mic particles was conducted and the morphology of the particles was reasonably predicted.To verify the accuracy of simulation results,(Ti+C)/Ni60 laser cladding layer was prepared on H13 steel substrate.The morphology of TiC and the phase and hardness of the coating were analyzed by scanning electron microscope(SEM),energy dispersive spectroscope(EDS),X-ray diffractometer(XRD),and micro-hardness tester.The results show that the morphology of TiC particles obtained by simulation prediction has high consistency with the one obtained by experiments.The plane shapes of TiC particles are usually quadrila-teral,such as square and rhombus.In the cladding process,the main causes for the inconsistency between the predicted and actual morphologies include the cladding environment,phase growth inhibition,and solid-liquid phase interaction.The TiC ceramic particles prepared in-situ are evenly distributed in the coating,and the microhardness of the coating is significantly improved.