朱润东,李志勇,李晓锡,孙琪.AZ91D 镁合金表面激光熔覆 Al-Cu 合金的温度场模拟与验证[J].表面技术,2014,43(6):84-89,130.
ZHU Run-dong,LI Zhi-yong,LI Xiao-xi,SUN Qi.Simulation and Experimental Verification of Laser Cladding Temperature Field for Al-Cu Alloy on AZ91D Magnesium Alloy Surface[J].Surface Technology,2014,43(6):84-89,130 |
| AZ91D 镁合金表面激光熔覆 Al-Cu 合金的温度场模拟与验证 |
| Simulation and Experimental Verification of Laser Cladding Temperature Field for Al-Cu Alloy on AZ91D Magnesium Alloy Surface |
| 投稿时间：2014-07-08 修订日期：2014-12-10 |
| DOI： |
| 中文关键词: 激光熔覆 工艺参数 温度场 |
| 英文关键词:laser cladding technological parameters temperature field |
| 基金项目:山西省回国留学人员科研基金资助项目(2012-69);山西省留学人员科技活动项目择优资助(2013) |
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| Author | Institution |
| ZHU Run-dong | Welding Research Center, North University of China, Taiyuan 030051, China |
| LI Zhi-yong | Welding Research Center, North University of China, Taiyuan 030051, China |
| LI Xiao-xi | Welding Research Center, North University of China, Taiyuan 030051, China |
| SUN Qi | Welding Research Center, North University of China, Taiyuan 030051, China |
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| 摘要点击次数: |
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| 中文摘要: |
| 目的 确定 AZ91D 镁合金表面激光熔覆 Al-Cu 合金的最佳工艺参数。 方法 利用有限元软件ANSYS 建立℃动高斯热源作用下的温度场三维模型,对不同参数下激光熔覆过程中的温度场进行动态模拟,确定工艺参数。 结果 熔池中心的温度随着激光功率的增大而增大,随着热源℃动速度和光斑直径的增大而减小。 温度过高时,熔覆层下塌且内部出现裂纹;温度过低时,熔覆层上有大量的金属颗粒且内部含有夹杂物。 结论 当功率为 240 W、扫描速度为 2. 5 mm/ s、光斑直径为 0. 6 mm 时,熔池中心的温度约为 1100 ℃ ,熔覆层与基体接触面的温度约为 700 ℃ 。 在此参数下得到了表面成形光滑且与基体结合紧密的致密熔覆层。 |
| 英文摘要: |
| Objective To get the optimal technological parameters for Al-Cu alloy cladded coatings on AZ91D magnesium alloy prepared by laser cladding. Methods The three-dimensional temperature field model of laser cladding under the moving GUASS heat source was established with ANSYS software. Then, the dynamic simulation of temperature field for laser cladding was conducted under different technological parameters. And the technological parameters were optimized by contrasting the melting point of Al-Cu alloy and the welding pool temperature. Finally, the experimental verification was performed. Results The results showed that the temperature at the center of welding pool increased with the rise of power (P) while decreased with the rise of the speed (v) of heat source and the diameter(d) of facula. When the temperature was excessively high, the cladding layer was collapsed and with internal cracks. However, when the temperature was too low, the cladding layer was covered with large amount of metal particles, and there were internal inclusions. Conclusion Under the conditions of P=240 W, v=2. 5 mm/ s and d=0. 6 mm, the temperature at the center of welding pool was about 1100 ℃, and the temperature at the contact surface of cladding and substrate was 700 ℃ . The smooth and compact cladding layer cohesively combined with substrate was obtained by experiment with those technological parameters. |
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