磨料粒径及形状对磨料水射流切割钛合金表面微观形貌的影响

采用不同粒径与形状的磨料颗粒，在磨料水射流切割平台上切割钛合金，用超景深显微镜等设备分析，以研究不同的磨料粒径及形状对钛合金表面微观形貌的影响。研究表明:磨料粒径越大，钛合金表面所形成的划痕越长，80目磨料颗粒形成的微划痕长度约为160目磨料的5倍。且球形磨料颗粒所形成的划痕末端堆积较少，其表面线粗糙度低于9.5 μm；具有棱边的磨料颗粒所形成的划痕有唇状或鳞片状金属堆积，其表面线粗糙度在9.5～13.0 μm间；柱体形的磨料颗粒冲击形成的划痕带有尖锐的棱角，其表面粗糙度大于13.0 μm。 

Effect of abrasive size and shape on surface microstructure of titanium alloy cut by abrasive water jet

Abrasive grains,with different sizes and shapes,were used to cut titanium alloy on a cutting platform to study the effect of impingement jet on the micro-morphologies of alloy surface.The surface quality of the alloy was characterized by using an ultra-depth-of-field microscope.The results show that the larger the abrasive particle size,the longer the scratches formed,which is that the micro-scratch length caused by 80-mesh abrasive particles is about 5 times longer than that of 160-mesh abrasive particles.It is also found that the scratches formed by spherical abrasive particles have less accumulation,whose surface linear roughness is less than 9.5μm,and that the linearity roughness of the surface scratched by edged grains is between 9.5μm and 13.0μm,with lip-like or scaly metal accumulations.Scratches formed by impact of cylindrical abrasive particles have sharp edges and corners with surface roughness more than 13.0μm.