Generation of Dislocations During Cold Sintering of Iron Powder

Abstract

An iron powder (Fe 98.5%; C 0.1%; 02 0.1%; Si 0.2%; Mn 0.5%), previously heated in hydrogen at 650°, with a mean agglomerate size of 230 $μ$m, was pressed in the pressure range of 100-1000 MPa. The consolidation process of iron powder in the pressure range of 100-1000 MPa took place in two stages, with a boundary between 290-480 MPa. Plastic flow started at ∼245 MPa, which indicated partial overlapping of consolidation mechanisms. Dislocations in networks on boundary regions between crystallites are more difficult to annihilate, as they require a higher energy than free dislocations in the crystallite vol. From the structural aspect, processes of dislocation network formation dominate in the second stage (dislocations can be easily set into motion in the crystallite vol.) in boundary regions between crystallites. [on SciFinder(R)]