| 激光熔覆Co基合金温度场的数值模拟 |
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| 引用本文： | 丁林,李明喜. 激光熔覆Co基合金温度场的数值模拟[J]. 激光技术, 2012, 36(1): 103-106 |
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| 作者姓名： | 丁林 李明喜 |
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| 作者单位： | 1. 安徽国防科技职业学院机械工程系,六安,237011
2. 安徽工业大学材料科学与工程学院,马鞍山,243002 |
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| 摘 要： | 为了分析Co合金熔覆的温度场,采用有限元法建立了低碳钢表面上激光熔覆预置钴基合金粉末过程的3维模型,考虑温度变化对热物理参量的影响以及表面对流换热和辐射散热等影响因素,使用SYSWELD软件对激光熔覆过程中的温度场进行了分析,并进行了验证。结果表明,激光熔覆过程中的温度场变化是由非稳态到稳态的过程,光斑附近等温面较为密集,远离光斑处等温面较稀疏;在其它工艺参量不变的情况下,扫描速率为5mm/s时熔覆过程的稀释率为8.26%,可以获得良好的冶金结合;利用SYSWELD软件的校核功能,获得了扫描速率为3mm/s和4mm/s时熔覆过程中较为合适的功率分别为1.6kW和1.87kW。研究结果对工艺参量的优化和控制熔覆层稀释率提供了借鉴和指导作用。
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| 关 键 词： | 激光技术 有限元法 Co合金 温度场 SYSWELD软件 |
| 收稿时间： | 2011-04-14 |
Numerical simulation of temperature field of laser cladding Co-based alloy coatings |
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| DING Lin , LI Ming-xi. Numerical simulation of temperature field of laser cladding Co-based alloy coatings[J]. Laser Technology, 2012, 36(1): 103-106 |
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| Authors: | DING Lin LI Ming-xi |
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| Affiliation: | 1.Department of Mechanical Engineering,Anhui Vocational and Technical College of Defense Technology,Luan 237011,China;2.School of Materials Science and Engineering,Anhui University of Technology,Maanshan 243002,China) |
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| Abstract: | In order to analyze temperature field of laser cladding Co-based alloys, a 3-D physical model of laser cladding Co-based alloys was built for low carbon steel substrate preset Co-powder by means of finite element method. Taking into account of the effect of temperature on the thermo-physical parameters, the surface convective heat transfer, and the radiant heat transfer, the temperature in the laser cladding process was analyzed with SYSWELD software and verified in experiments. A 5kW CO2 laser was used to prepare Co-based alloy coatings on low carbon steel substrate. Dilution rate of the coating were examined. The results showed that temperature field changed from non-steady-state to steady-state in the laser cladding process. Denser isothermal surface and thinner isothermal surface were found near the laser spot and away from the laser spot. With the other parameters keeping the same, favorable metallurgy bonding was obtained with 8.26% dilution at scanning velocity of 5mm/s. Right power with 1.6kW and 1.87kW was found at scanning velocity of 3mm/s and 4mm/s by means of SYSWELD software. These results provide reference and guidance for parametric optimization and dilution rate control in laser cladding. |
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| Keywords: | laser technique finite element method Co-based alloys temperature field SYSWELD software |
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