送粉式激光增材制造中热/质输入对熔池特征的影响 | |
英文题名 | Effect of heat input and mass addition on the characteristics of molten pool for powder-feeding laser additive manufacturing |
陈茹 | |
导师 | 虞钢 |
2018-06 | |
学位授予单位 | 中国科学院大学 |
学位授予地点 | 北京 |
学位类别 | 博士 |
学位专业 | 一般力学与力学基础 |
关键词 | Powder Feeding Laser Additive Manufacturing, Thermal And Mass Input, Powder Flow, Molten Pool, Microstructure |
英文摘要 | Powder-feeding laser additive manufacturing is a technology using laser beam as the heat source, and adding powder particle simultaneously. The part is deposited after the molten pool solidified. This technology is widely used in aerospace, medical, automobile and other fields. Laser beam and powder particle are the boundary condition of heat input and mass input respectively. The energy density distribution of laser beam, material properties and process parameters are the most important factors for powder-feeding laser additive manufacturing. They not only determine the characteristics and evolution of the molten pool but also affect the morphology and microstructure of deposited layer. In this paper, laser beam with Gaussian distribution and strip distribution were selected as the heat source. Meanwhile, the property of powder particles and base metal, the concentration distribution of powder flow and process parameters was analyzed. The formation, evolution and solidification of the molten pool caused by the interaction between laser beam, powder particle and base metal were studied. It has important scientific significance and engineering value to understand the physical mechanism for laser additive manufacturing and control the quality of deposited layer |
索取号 | Phd2019-029 |
语种 | 中文 |
文献类型 | 学位论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/79251 |
专题 | 先进制造工艺力学实验室 |
推荐引用方式 GB/T 7714 | 陈茹. 送粉式激光增材制造中热/质输入对熔池特征的影响[D]. 北京. 中国科学院大学,2018. |
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陈茹送粉式激光增材制造热质输入对熔池特征(6150KB) | 学位论文 | 开放获取 | CC BY-NC-SA | 请求全文 |
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