The influence of printing parameters on the residual stress of AlSi10Mg alloy parts formed by SLM process was explored via the finite element simulation and experimental testing.The results show that there exist three peak temperatures during printing

and with the increase of substrate temperature

laser power

scanning speed and scanning interval

the residual stress of the workpiece is decreased firstly and then increased.With the laser power of 450 W

the scanning speed of 1 100 mm/s

the scanning interval of 70μm

and the substrate temperature of 200℃

the printed parts have the minimum residual stress.Based on the optimized parameters

the tensile strength

yield strength and elongation of the printed parts reach 480 MPa

310 MPa

and 6%

respectively.The microstructure of printing specimen is composed of coarse grained zone

fine grained zone

and heat affected zone

in which the Si phase is distributed in a network structure.