Based on 3 D technology

a 316 L stainless steel green body was prepared

solidified and degreased

and then high-vacuum sintered at 1 385 ℃

1 410 ℃ and 1 435 ℃ to verify the feasibility of pressureless sintering and densification of the printing green body. The influence of sintering process on density

mechanical properties and tensile fracture of the specimens was investigated. The results show that it is feasible to achieve densification of printed blanks through pressureless sintering. With the increase of the sintering temperature

the density of the samples increased and the size contraction is increased

and the mechanical properties such as the strength and plasticity are also greatly improved. With sintered at 1 435 ℃

its relative density reaches 88.7%

and the volume shrinkage rate is 37.0%

the yield strength is 160 MPa

which is close to the level of 177 MPa. Meanwhile

the tensile strength is 355 MPa

and the elongation reaches 26.4%.