选择性激光烧结工艺制备的钴铬合金的微观结构-中国材料进展

文章信息/Info

Title:: The Microstructure of the CoCr Alloys Fabricated by a Selective Laser Melting Technique

作者:: 王兵; 宋昕; 彭练; 佟岱; （1. 北京大学口腔医学院·口腔医院，义齿加工中心口腔数字化医疗技术和材料国家工程实验室口腔数字医学北京市重点实验室，北京 100081）（2. 中国科学院过程工程研究所，北京 100190）

Author(s):: WANG Bing; SONG Xin; PENG Lian; TONG Dai; （1. Dental Laboratory, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology，Beijing 100081， China）（2. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China）

摘要:: 对比选择性激光烧结工艺(SLM)和铸造工艺(cast)制备的CoCr合金的内部微观结构，分析产生不同微观结构的原因，并分析不同微观结构对CoCr合金性能可能造成的影响。选取组成接近的CoCr合金金属粉末和金属块，分别通过SLM工艺和cast工艺制作CoCr合金试样。利用场发射扫描电镜(SEM)观察样品内部的微观结构并采用X射线能谱(EDX)分析样品特征区域的化学成分。SLM工艺制备的样品的内部结构均匀，没有出现分相区，而离心cast工艺和真空cast工艺制备的样品内部均出现富含Mo元素的分相区。SLM工艺和cast工艺制备的样品的孔洞均较少。对于CoCr合金而言，SLM工艺的加工质量优于cast工艺。

Abstract:: The microstructure difference of the CoCr alloys fabricated by a cast technique and a SLM (selective laser melting) technique is investigated, and the reasons causing the different microstructures and the effects of the different microstructures on the properties of the CoCr alloys are discussed. The CoCr alloy powder and bulk with similar compositions are selected to prepare CoCr samples using the SLM technique and the cast technique, respectively. The microstructures of the fabricated CoCr samples are investigated by SEM and the chemical compositions of featured areas are analyzed by EDX. The microstructure of the CoCr alloy fabricated by the SLM technique is uniform without phase separation. However, the phase separation rich in Mo element is found in the CoCr alloys fabricated by both the centrifugal cast technique and the vacuum cast technique. The CoCr samples fabricated by the SLM technique and the cast technique both contain less pores. In conclusion, the quality of the CoCr alloy fabricated by the SLM technique is better than the cast technique.