Journal ArticleDOI
On a New Two-Step Air Cooling Method Following Thermomechanically Controlled Rolling: Microstructural Evolution and Mechanical Properties of a High-Strength Multiphase Medium Carbon Microalloyed Steel
Hari Srinivasa Rao Magham,Nandakumar Maheswari,Kumar K. R. Dinesh,L. Vijayaraghavan,Shanmugam Sankaran,K. A. Padmanabhan +5 more
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This article is published in Steel Research International.The article was published on 2021-05-01. It has received 0 citations till now. The article focuses on the topics: Microalloyed steel & Air cooling.read more
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Journal ArticleDOI
Deformation and fracture mechanisms in fine- and ultrafine-grained ferrite/martensite dual-phase steels and the effect of aging
TL;DR: In this paper, three ferrite/martensite dual-phase steels varying in the ferrite grain size (12.4, 2.4 and 1.2μm) but with the same martensite content (∼30 vol%) were produced by large-strain warm deformation at different deformation temperatures, followed by intercritical annealing.
Journal ArticleDOI
Geometrically necessary dislocation and size-dependent plasticity
Huajian Gao,Yonggang Huang +1 more
TL;DR: In this paper, a brief summary of geometrically necessary dislocations and their role in the development of continuum plasticity theories with an intrinsic material length scale is presented.
Journal ArticleDOI
The bainite transformation in a silicon steel
Abstract: An experimental silicon steel has been used in a detailed kinetic and structural study of the bainite transformation in an attempt to resolve some of the controversies concerning the reaction mechanism. Distinct reaction ‘C’ curves and transformation mechanisms were observed for the upper and lower bainite reactions. The observed set of three minima in transformation kinetics were found to be incompatible with the solute drag explanation of the kinetic Bs temperature. Transmission electron microscopy indicated the growth of both upper and lower bainite by the propagation of displacive subunits, with adjacent nucleation in the latter case. Definite evidence for carbon supersaturation was obtained for the lower bainitic ferrite. The results are best explained in terms of a shear mechanism for the ferritic component of bainite rather than a ledge mechanism (as is observed in Widmanstatten ferrite growth). Carbide precipitation events were also characterized and the evidence suggested that precipitation resulted from the aging of a supersaturated matrix in lower bainite. The evidence also suggests that carbide precipitation events are of secondary importance to the essence of bainite formation. It was further proven that the concept of a metastable equilibrium1 controlling the transition from upper to lower bainite was not applicable to the present steel and indeed, if any metastable equilibrium does exist in any other steel, it does not constitute a general phenomenon and hence is not essential to the bainite transformation mechanism.
Journal ArticleDOI
Effect of microstructure on the stability of retained austenite in transformation-induced-plasticity steels
TL;DR: In this article, two Fe-0.2C-1.5Si steels with and without the addition of 0.039Nb were studied using laboratory rolling-mill simulations of controlled thermomechanical processing and the microstructures of all samples were characterized by optical metallography, X-ray diffraction, and transmission electron microscopy (TEM).
Journal ArticleDOI
On the Influence of Interactions between Phases on the Mechanical Stability of Retained Austenite in Transformation-Induced Plasticity Multiphase Steels
TL;DR: In this article, the authors measured the variation of the volume fraction of untransformed retained austenite as a function of uniaxial plastic strain and found that the increase of the mechanical stability of retained Austenite is not solely related to the decrease of the M s temperature induced by carbon enrichment.
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