Structure and Characteristics of EP648 and VZh159 Alloys Synthesized by Selective Laser Melting after Simulated Annealing

Abstract

Abstract The structure and characteristics of EP648 and VZh159 heat-resistant alloys synthesized by selective laser melting after HIP, aging, and simulated annealing for 500 h are compared. The disbalance of alloying of EP648 and VZh159 alloys is calculated. It is shown that a decrease in strength characteristics, an increase in ductility, and a decrease in the period between simulated annealing and fracture of EP648 alloy is related to a decrease in the volume fraction of the particles of the σ phase caused by precipitation of α-Cr particles. It is determined that the synthesized VZh159 alloy after simulated annealing is far superior to the EP648 alloy according to the set of mechanical characteristics owing to more balanced alloying.