选择性激光烧结工艺制备的钴铬合金的微观结构

摘要

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.%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.