Mechanical Properties of GH4169 superalloy Prepared by Selective Laser Melting

Using selective laser melting technique, 3 sets of GH4169 samples were formed by various laser power and scanning speed to prepare mechanical properties test specimens. The defects and porosity of the samples were measured by CT inspection. The tensile test was carried out at room temperature. The fracture morphology of the tensile samples was observed by SEM and the fracture mechanism was analyzed. The results show that some samples have pores with largest size of 100μm, which have no effect on the subsequent tensile properties test. The tensile strength does not change significantly with the varying process parameters, and the highest strength could reach 1480MPa. The elongation and the reduction of area decrease gradually as the scanning speed increases, indicating that the plasticity of the material is descending. The fracture mechanism of the three sets specimens are ductile fractures, and the microscopic morphology shows distribution of equiaxed dimples.