Topic
Microalloyed steel
About: Microalloyed steel is a research topic. Over the lifetime, 2183 publications have been published within this topic receiving 33586 citations.
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TL;DR: At high temperatures, materials display rate dependent plasticity, which in global terms is controlled by the glide and climb of dislocations as discussed by the authors, which is a common phenomenon in flow behavior under hot temperatures.
Abstract: At high temperatures, materials display rate dependent plasticity, which in global terms is controlled by the glide and climb of dislocations. Classical descriptions of the flow behaviour under hot...
43 citations
TL;DR: In this paper, the development of austenite grain structures have been compared in two different microalloyed steels (Nb-Ti and Nb-V steels) and one Al killed C-Mn steel, after soaking at 950-1250°C for 1 h.
Abstract: Development of austenite grain structures have been compared in two different microalloyed steels (Nb–Ti and Nb–V steels) and one Al killed C–Mn steel, after soaking at 950–1250°C for 1 h. Minimum austenite grain size in Nb–V steel at the lower soaking temperature ( 1200°C) in all the steels. Higher stability of TiN precipitate restricted the grain growth in Nb–Ti steel at higher soaking temperature. An effort has been made to predict the austenite grain size considering both solute drag and Zener drag.
43 citations
TL;DR: In this paper, the effect of the reversal of the strain for a Nb-microalloyed steel is discussed, and it is shown that depending on the magnitude of this reversal, the static softening kinetics can be accelerated or delayed.
43 citations
TL;DR: In this article, it was found that both dissolved Nb in austenite and free B are prerequisites for granular bainite formation and there is a critical B content to achieve the complete bainitic transformation strengthening effect.
Abstract: Microalloying with Nb and B leads to a granular bainite microstructure which is composed of a bainitic ferrite matrix and a uniformly distributed martensite/austenite-constituent in the as-rolled condition. Due to this transformation strengthening mechanism, high strength and toughness could be achieved even though the C content was extremely low. It was found that both dissolved Nb in austenite and free B are prerequisites for granular bainite formation. Furthermore, there is a critical B content to achieve the complete bainitic transformation strengthening effect. The critical B content increases with C content. C thus diminishes the effect of B in promoting bainite transformation, due to the formation of boron carbides or the depletion of dissolved Nb in austenite. The effect of Mn, Mo and Ni on the decomposition of austenite is similar. A parameter“Mneq” which relates the effect of these alloying elements on the Bs temperature was derived. It was confirmed that the strength of bainitic steels is inversely proportional to theBs temperature.
43 citations
TL;DR: In this paper, the evolution of austenite formation during a continuous heating in a low carbon niobium microalloyed steel with a pearlite and ferrite initial microstructure has been studied.
Abstract: Austenite formation during a continuous heating in a low carbon niobium microalloyed steel with a pearlite and ferrite initial microstructure has been studied. Characteristic transformation temperatures, Ac 1, Ac θ and Ac 3 and the evolution of austenite formation have been determined by combining dilatometry and metallography in a range of heating rates from 0˙05 to 10 K s–1. It has been observed that nucleation and growth of austenite depends highly on the applied heating rate. At low heating rates (0˙05 K s–1) nucleation of austenite takes place both at pearlite nodules and at ferrite grain boundaries, while for higher heating rates (≥0˙5 K s–1), nucleation at grain boundaries is barely present compared to the nucleation at pearlite nodules. The heating rate also affects the austenite growth path and morphology and, thus, the distribution of martensite in the dual phase microstructure obtained at room temperature.
43 citations