Laser surface-alloying method was applied on steel in order to develop a functional gradient Inconel/Steel material Inconel 690 sheet was placed on steel substrate, and then a series of high power CO_2 laser beam was irradiated on surface in oreder to...
Laser surface-alloying method was applied on steel in order to develop a functional gradient Inconel/Steel material Inconel 690 sheet was placed on steel substrate, and then a series of high power CO_2 laser beam was irradiated on surface in oreder to produce homogeneous alloyed layer Simultaneous compositional gradients of two different kinds of alloying elements (Cr and N_1) were investigated in this material In order to determine the microstructure, phase and compositional profiles in this material, SEM, XRD and EDS were used Sequential repetition of laser surface-alloying treatments up to 4 times resulted in about 3 mm layer of fair compositional gradients from 21% to 0% for Cr, from 40% to 0% for N_1 and from 39% to 99% for Fe in this material Since compressive stress was formed in heat-affected region due to martensitic transformation while relative tensile stress was developed in alloyed region, cracks were formed at the boundary region between alloyed region and substrate region (Received December 31, 1996)