Effect of Nb and Cr on iron and nickel based superalloys microstructural changes

Abstract

The investigations were carried out on superalloys different chemical compositions, the common being that except of dominant content of Ni, Fe, Cr, Co and Mo, they consist of W, Mn, Si C, Al as well. Iron based superalloy is alloyed with Nb. The yield strength, tensile strength and elongation were determined by tensile strength tests, and the interaction of pulsed Nd:YAG laser beam with iron and nickel based superalloys samples were analyzed by a scanning electron microscope (SEM) and an energy-dispersive X-ray spectrometry (EDS). In this paper, the effect of Nb and Cr on the microstructural changes arisen by laser beam action was discussed, with the aim to determine the optimal regime that provides good chemical and mechanical properties of researched superalloys.