钛合金表面激光熔覆TiC/NiCrBSi涂层温度场有限元模拟

为在钛合金表面获得优质激光熔覆涂层,用有限元方法研究了激光熔覆工艺对熔池温度场分布和凝固后熔覆层组织的影响,考虑相变潜热、辐射对流散热以及温度对热物理性能的影响等因素,建立三维有限元模型模拟了Ti6Al4V合金表面激光熔覆TiC/NiCrBSi复合涂层过程中的温度场,并结合熔覆过程的温度场分布,对涂层的形貌、结合区、基...

Temperature distribution simulation of laser cladding TiC/NiCrBSiC coating on Ti6Al4V alloy by a finite element model

To fabricate a good quality laser cladding coating on titanium alloy,the influence of laser cladding processing parameters on the temperature distribution of the molten pool and the microstructure of the laser cladding coating were investigated by finite element method.Considering of the latent heat,radiation,convection and influence of temperature on thermal properties,a three-dimensional finite element model was proposed to simulate the temperature distribution of laser cladding TiC/NiCrBSiC composite coatings on Ti6Al4V alloy.According to the simulated temperature distribution,the surface morphology,bonding zone,heat affected zone of the substrate and dilution rate of the coatings were analyzed.The results show that a good quality laser cladding TiC/NiCrBSiC composite coating with low dilution rate and excellent metallurgical bond can be prepared under the processing parameters as follows: scanning velocity 4 mm/s,laser beam diameter 4.5 mm and incident laser power 2500 W.There exhibits an excellent agreement between the simulated results and experimental data.The model can exactly show the temperature distribution during laser cladding process.