Effect of process parameters on density and mechanical behaviour of a selective laser melted 17-4PH stainless steel alloy

Abstract 17-4 PH stainless steel alloy has been widely used in the field of defence industry such as weapon equipment, aerospace, nuclear energy, and so on because its high strength, toughness, temperature resistance, corrosion resistance. In order to meet flexible manufacturing requirements multi-variety small batch complex structure products with lower cost higher efficiency, selective laser-melted 17-4PH become focus research rapid recent years. this article, density characteristics distribution holes spheroidization phenomena pre-alloyed powder subjected multidimensional conduction under laser melting are studied, mechanism defect generation is proposed. Finally, optimal selection combination different process parameters was carried out by orthogonal test, it found that comprehensive mechanical behaviour after being formed exceeded ASTM A564 standard (the yield strength 1,132 MPa, tensile 1,323 elongation 16.6%).