Recovery of Ductility in Ultrafine-Grained Low-Carbon Steel Processed Through Equal-Channel Angular Pressing Followed by
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Recovery of Ductility in Ultrafine-Grained Low-Carbon Steel Processed Through Equal-Channel Angular Pressing Followed by Cold Rolling and Flash Annealing RAJ BAHADUR SINGH, N.K. MUKHOPADHYAY, G.V.S. SASTRY, and R. MANNA The low-carbon steel workpieces are deformed by equal-channel angular pressing at 293 K (20 C) up to an equivalent strain of ~12 using route Bc, which results in the bulk ultrafine-grained (UFG) structure with high dislocation density and partial dissolution of cementite. The yield strength (YS) is enhanced from 208 (as-received) to 872 MPa and the tensile strength is increased from 362 to 996 MPa, but the material loses total elongation (TE) from 36.2 to 2.9 pct. Cold rolling of equal-channel angular pressed steel produces the refined structure of grain size 0.11 lm. The YS increases further to 924 MPa with a marginal gain in ductility due to the reappearance of the c fiber component. Flash annealing the samples, which were equal-channel angular pressed followed by cold rolling, at 873 K (600 C) results in 27 pct of micron-sized (9 lm) ferrite grains in submicron-sized (
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