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流体流和应力场在合金的激光层表面修复过程中:多轨道模拟
Quan Wu1, Haiping Chu1, Zhongkui Liu2,3
1School of Mechanical and Electrical Engineering, Guizhou Normal University, Guiyang 550001, China.
Materials (Basel, Switzerland)
|April 24, 2025
概括
这项研究通过模拟融流和热应力来优化合金的激光覆盖 (LC). 结果揭示了修复表面缺陷的最佳参数,并建议冷却间隔以防止裂,提高组件修复质量.
科学领域:
- 材料科学与工程 材料科学与工程
- 制造过程 制造过程 制造过程
- 计算建模 计算建模
背景情况:
- 激光覆盖 (LC) 提供了合金修复的潜力.
- 挑战包括融化流动的不稳定性,热应力,以及由此产生的裂/表面缺陷.
研究的目的:
- 研究合金的多轨激光层修复机制.
- 优化过程参数以提高维修质量和减少缺陷.
主要方法:
- 采用流体流动和应力场模型.
- 使用有限体积法 (FVM) 进行化池动态.
- 应用有限元素分析 (FEA) 用于热应力评估.
主要成果:
- 优化的参数 (1600W激光功率,600毫米/分钟扫描速度) 产生了稳定的融化池 (0.2米/秒速度,0.7毫米深度,4毫米宽).
- 300-900微米的表面缺陷得到了有效的修复.
- 多层外产生的应力>1300 MPa,需要≥3s的冷却间隔来防止裂.
结论:
- 调整激光功率和扫描速度控制化池的稳定性.
- 实施冷却间隔可以减轻残余应力和裂纹风险.
- 优化的LC工艺提高了合金组件的维修质量.
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