Effect of Scanning Distance on Microstructure and Hardness of Selective Laser Melted 316L Stainless Steel
Under the laser power of 180 W,scanning speed of 800 mm/s,layer thickness of 0.03 mm,rotation angle of 45°,the selective laser melting tests were carried out by changing the laser scanning distance.The influence of laser scanning distance on the surface morphology,microdefects,microstructure and hardness of selective laser melted 316L stainless steel samples was studied.The results show that the surface quality of the sample deteriorates gradually with the increase of scanning distance,and the number and size of microdefects such as holes and poor fusion in the sample change.When the scanning distance is 0.09 mm,the micro-defects in SLM formed 316L stainless steel sample are the least.With the increase of the scanning distance,the grain morphology changes from columnar to equiaxed.There are two types of microscopic substructures:columnar and cellular sub-structures.The cellular substructure is basically located at the junction of several molten pools.The scanning distance has little influence on the hardness of the sample,and the hardness value is between 210 and 220 HV.
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