The selective laser melting technology was used to form 150μm layer thickness 316 Lstainless steel to explore high-density forming processes by comparing different laser power

energy density

exposure time

point distance and hatch space.The results reveal that the formation quality of large layer thickness specimens at high power presents more desirable

and the optimized laser energy density range for large layer thickness formation is 50～70 J/mm

3

.By comparing the small layer thickness and the large layer thickness forming process

it is concluded that although the large layer thickness forming has some defects in the forming process

and most of the defects can be suppressed by adjusting the process parameters.The microstructure of large layer thickness 316 L stainless steel is mainly composed of equiaxed crystals and a small amount of columnar crystals.The mechanical properties of the specimens reach the standard values of specification for steel forgings.