Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering

A new approach to modelling the microstructure evolution and yield strength in laser powder bed fusion components is introduced. Restoration mechanisms such as discontinuous dynamic recrystallization, continuous recovery were found be activated during of austenitic stainless steels; these are modelled both via classical Zener-Hollomon thermostatistical approaches. mechanism suggested for formation dislocation cells from solidification dendrites, their further transformation low-angle grain boundaries form subgrains. This occurs due fusion. The successfully a Hall–Petch-type relationship terms subgrain size, instead actual size or cell size. validated equation steels provides guideline strengthening alloys with refinement, increasing boundary fraction (grain engineering). To obtain higher strength, should promoted main induce boundaries. dependency stress on process parameters alloy composition quantitatively described.