Optimization of TMCP strategy for microstructure refinement and flow-productivity characteristics enhancement of low carbon steel

Publication date: Available online 27 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Eman El-Shenawy, Reham RedaAbstractImproving the mechanical properties of low carbon steel through the microstructural refinement without adding alloying elements is a complicated scientific and technical mission. This challenge can be overcome by using thermo-mechanical controlled processing (TMCP) technology. Most researches have examined the influence of TMCP on the microstructure development without shed light on the flow characteristics. The current work aims at studying the effect of applying different TMCP strategies on the microstructure refinement, flow-productivity characteristics, i.e. peak stress, flow stress, strain hardening index, Zener–Hollomon parameter and total strategy time, of low carbon steel. These TMCP strategies involve applying heavy deformation in single-pass TMCP strategy versus light deformation/pass in multi-pass TMCP strategy through applying different plane-strain hot compression regimes using Gleeble 3500 thermo-mechanical simulator. The proposed TMCP strategies have been involved application of heavy accumulative strain of 45–57% through: (1) single pass TMCP strategy at various strain rates (0.01, 0.1 and 1.0 s−1), (2) double pass TMCP strategy at different strain rates and (3) multi-pass TMCP strategy at strain rate of 0.1 s−1. Microstructures after the diverse TMCP strategies reveal ferrite grain refinement and the...
Source: Journal of Materials Research and Technology - Category: Materials Science Source Type: research