Effect of Heat Treatment on Microstructure and Properties of GH3536 Fabricated by Selective Laser Melting

Selective laser melting (SLM) forming technology to prepare nickel-based superalloy parts can significantly save costs and solve bottleneck problems. The extremely high-temperature gradient large residual stress during SLM lead structural defects compositional segregation. formed by urgently need heat treatment control the microstructure composition improve mechanical properties. Results showed that did not change microcracks pores in sample, but carbides grain boundary gradually changed from a granular distribution continuous strip distribution. After treatment, elongation increased significantly, yield strength decreased. tensile fracture of samples transgranular ductile fracture, obvious plastic deformation occurred, confirming benefits sample.