| 引用本文: | 雷贻文,孙荣禄,唐英.钛合金表面激光熔覆TiC/NiCrBSi涂层温度场有限元模拟[J].材料科学与工艺,2011,19(6):100-105.DOI:10.11951/j.issn.1005-0299.20110618. |
| LEI Yi-wen,SUN Rong-lu,TANG Ying.Temperature distribution simulation of laser cladding TiC/NiCrBSiC coating on Ti6Al4V alloy by a finite element model[J].Materials Science and Technology,2011,19(6):100-105.DOI:10.11951/j.issn.1005-0299.20110618. |
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| 摘要: |
| 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、基体热影响区、稀释率和微观组织进行了分析和试验验证.结果表明:激光熔覆工艺参数为激光功率2500 W、扫描速度4 mm/s、光斑直径4.5 mm时,可获得无气孔、无裂纹、具有良好冶金结合和低稀释率的优质涂层;试验结果和模拟结果表现出很好的一致性,说明所建立的有限元模型能够真实准确地反映激光熔覆过程中的温度场分布. |
| 关键词: 激光熔覆 复合涂层 有限元法 温度场 稀释率 |
| DOI：10.11951/j.issn.1005-0299.20110618 |
| 分类号:TG174.44 |
| 基金项目:教育部博士点基金资助项目(20091201110002);天津市应用基础及前沿技术研究计划资助项目(11JCZDJC21400) |
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| Temperature distribution simulation of laser cladding TiC/NiCrBSiC coating on Ti6Al4V alloy by a finite element model |
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LEI Yi-wen1,2, SUN Rong-lu1, TANG Ying1
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1.School of Mechanical Engineering,Tianjin Polytechnic University,Tianjin 300160,China;2.Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology,Tianjin 300160,China
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| Abstract: |
| 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. |
| Key words: laser cladding composite coatings finite element temperature distribution dilution rate |
