金属粉末激光选区烧结过程的特征探讨

采用激光选区烧结的方法,对Ni基合金粉末进行了一系列激光烧结成形试验.在试验的基础上,阐述了用激光直接熔化金属粉末,烧结成形金属零件的一些基本特征,这主要包括在激光烧结成形过程中的熔池球化特征、熔体流动特征和动态凝固组织特征.分析了熔池球化现象对烧结成形的不利影响,提出了减少粉层厚度和加大激光功率,可避免熔池球化现象的出现.进一步探讨了烧结过程的基本规律和烧结成形的基本机理,为金属粉末的直接激光烧结成形提供了依据.

Study on the characteristic of laser sintering metallic powder

A series of experiments is carried out with selective laser sintering (SLS) for Ni based alloy powders. On the basis of a lot of experiments, some basic characteristics during SLS are systematically studied. These characteristics include the characteristic of the forming sphere of the molten pool, the characteristic of the melt flow in the molten pool and the characteristic of dynamic solidification. Through the analysis of the effect of the appearance of spheres upon metal forming, a conclusion is reached that the forming spheres can be avoided by reducing the thickness of the powder layer and adding laser power. The basic rules of the sintering course are explored further. All of the above lay the foundation for the forming metal spare parts by laser sintering metallic powder.