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| 镍合金激光直接烧结成形制件显微结构及微观缺陷 | |
| 引用本文： | 赵剑峰,张建华,张剑峰,余承业,黄因慧.镍合金激光直接烧结成形制件显微结构及微观缺陷[J].中国机械工程,2005,16(3):264-267. |
| 作者姓名： | 赵剑峰 张建华 张剑峰 余承业 黄因慧 |
| 作者单位： | 1. 南京航空航天大学,南京,210016 2. 南京工程学院,南京,210013 3. 扬州大学,扬州,225009 |
| 摘 要： | 利用自行研制的激光直接烧结快速成形系统进行了镍合金激光直接烧结成形试验，获得了具有复杂三维形状的镍合金样件；讨论了激光直接照射下镍合金材料的熔凝过程及微观结构特征。研究表明，烧结过程为不完全液相烧结。金属材料系统中添加铜可有效地抑制球化效应，改善制件内部存在的微观缺陷；制件内部单一层面微观组织呈枝晶和等轴晶两种组织不均匀分布，此两种组织形态沿制件堆积方向交替重复出现。 |
| 关 键 词： | 直接激光金属烧结 镍合金粉末 液相烧结 微观结构 |
| 文章编号： | 1004-132X(2005)03-0264-04 |
Analysis on Microstructure Feature of Ni-Alloy parts prepared by Direct Laser Metal Sintering |
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| Zhao Jianfeng Zhang Jianhua Zhang Jianfeng Yu Chengye Huang Yinhui .Nanjing University of Aeronautics & Astronautics,Nanjing, .Nanjing Institute of Technology,Nanjing, .Yangzhou University,Yangzhou.Analysis on Microstructure Feature of Ni-Alloy parts prepared by Direct Laser Metal Sintering[J].China Mechanical Engineering,2005,16(3):264-267. | |
| Authors: | Zhao Jianfeng Zhang Jianhua Zhang Jianfeng Yu Chengye Huang Yinhui Nanjing University of Aeronautics & Astronautics Nanjing Nanjing Institute of Technology Nanjing Yangzhou University Yangzhou |
| Affiliation: | Zhao Jianfeng 1 Zhang Jianhua 2 Zhang Jianfeng 3 Yu Chengye 1 Huang Yinhui 1 1.Nanjing University of Aeronautics & Astronautics,Nanjing,210016 2.Nanjing Institute of Technology,Nanjing,210013 3.Yangzhou University,Yangzhou,225009 |
| Abstract: | The Direct Laser Metal Sintering (DLMS) experiments were carried out with Ni-alloy metallic powder material system,and a three-dimension metallic component was obtained. The melt-solidification process and microstructure feature of metallic part were discussed. The feature of DLMS process was represented as incomplete liquid phase sintering. In powder material system, the additive copper was acted as lowering the wetting angle between liquid phase and solid phase. The continuous solidification trace can be formed and the faults in microstructure are eliminated. Two kinds of crystal morphology are appeared in the melting pool, one is equiaxial dendrite structure located in center zone and the other is dendrite structure located at the marginal zone. These two crystal morphologies are interlaced and distributed layer by layer. |
| Keywords: | direct laser metal sintering liquid phase sintering Ni-alloy powder microstructure |
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