Modeling of Microstructural Gradients in TMCP Bars to Produce Value Added Products
Thermomechanical controlled processing of concrete reinforcement bars, comprising quenching and autotempering, produces a microstructural gradient across the diameter - tempered martensite near to the surface, bainite and/or degenerated pearlite in the intermediate layers and pearlite-ferrite within the core. Since martensite is the strength controlling phase in steels, its fractional thickness in TMCP bars have beeen correlated to tensile properties. The developed empirical model, helped in revealing that upto a fractional rim of about 20%, volume fraction of ferrite-pearlite predominantly influenced the YS, UTS and % elongation, whereas at higher fractions, martensite found to control these properties.
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
B. Singh and D. Rai, "Modeling of Microstructural Gradients in TMCP Bars to Produce Value Added Products", Materials Science Forum, Vols. 539-543, pp. 4143-4148, 2007