Carbon-defect interaction during recovery and recrystallization of heavily deformed pearlitic steel wires

Mechanisms of subgrain coarsening and its effect on the mechanical properties of carbon-supersaturated nanocrystalline hypereutectoid steel

“…This initial microstructure prior to annealing is significantly different from the materials studied in previous papers in which heterophase boundaries are still dominant [13,21,[26][27][28][29][30]. The present work focuses mainly on the evolution of the nanoscaled subgrain structure in ferrite during annealing.…”

“…They differ from each other not only in the defect density and interlamellar spacing, but also in the morphology and the volume fractions of the phase constituents. For the wires with low and moderate drawing strains lamellar structures are still dominant despite the cementite decomposition [13,21,[26][27][28][29][30]. For the present case with extremely high drawing strain of 6.0 a significant decomposition of cementite has occurred and the original lamellar structure has been replaced by a carbon-supersaturated ferrite subgrain structure [3].…”

“…The obtained average ultimate tensile strengths r UTS are presented as a function of T a in Fig. 1(b), where data with lower drawing strains taken from the literature [21,[26][27][28]30] are also plotted for comparison. It can be seen that the tensile strength at room temperature increases with d so that the strength of the current material lies well above the literature data.…”

“…The strength reduction of cold-drawn pearlite during annealing has been reported in Refs. [21,[26][27][28]30]. Some results obtained by microstructural investigations using TEM and APT can be found in Refs.…”

“…Some results obtained by microstructural investigations using TEM and APT can be found in Refs. [13,26,[28][29][30]. It is known that for the same heat-treatment condition the annealed microstructure of a material strongly depends on its microstructure prior to annealing.…”