Topic
Microalloyed steel
About: Microalloyed steel is a research topic. Over the lifetime, 2183 publications have been published within this topic receiving 33586 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the behavior of the microalloyed steel DIN 38MnSiVS5 simulated with the finite element method (FE) was studied, and three variables were evaluated: forming angle, relative reduction and speed.
29 citations
TL;DR: In this article, the static recrystallization kinetics of hot deformed austenite in hypereutectoid steels containing 1 % carbon with different levels of vanadium and silicon were studied.
Abstract: Compression tests were conducted in order to study the static recrystallization kinetics of hot deformed austenite in hypereutectoid steels containing 1 % carbon with different levels of vanadium and silicon. Tests were performed over a temperature range of 875 to 1 100°C using strain rates of 0.01, 0.1 and 1 s -1 . Graphs of the recrystallized fraction versus time were used to quantify the kinetics of the strain-induced precipitation and generate the precipitation temperature time diagrams for the three steels. A kinetic model for static recrystallization is proposed which takes the V and Si concentrations into account.
29 citations
TL;DR: In this article, a novel ultra-low carbon, high-molybdenum-bearing microalloyed steel has been thermomechanically processed and the transformation of this steel during continuous cooling has been assessed.
Abstract: In the current study, a novel ultra-low carbon, high-molybdenum-bearing microalloyed steel has been thermomechanically processed. Transformation of this steel during continuous cooling has been assessed. Variation in the microstructure and mechanical properties at different finish rolling temperatures has been studied. The average grain size, misorientation of grain boundary, and distribution of ferrite grains have been analyzed by using electron backscatter diffraction. The lower yield strength (251 to 377 MPa) with moderate tensile strength (406 to 506 MPa) along with high ductility (30 to 47 pct) has been achieved in the selected range of finish rolling temperatures. Superior impact toughness value in the range of 153 to 162 J is obtained in the subsize specimen even at subzero temperatures (233 K [−40 °C]), which is attributed to fine average ferrite grain size. The acicular ferrite dominated microstructure obtained at the 1023 K (750 °C) finish rolling temperature is the most attractive microstructure for pipeline applications due to its excellent combination of strength and toughness.
29 citations
15 Nov 2013-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the microstructure of a commercial pipeline microalloyed steel has been characterized by optical and electron microscopy considering the particularity of the thermomechanical processing without accelerated cooling.
Abstract: The microstructure of a commercial pipeline microalloyed steel has been characterized by optical and electron microscopy considering the particularity of the thermomechanical processing without accelerated cooling. The microstructure was a mixture of polygonal ferrite (PF) and granular bainite (GB). The well-known structure–property relationship for PF microalloyed steels is used in structures where high misorientation boundaries in the acicular ferrite are significant. In order to quantify the contributions of the precipitation strengthening as well as the dislocation hardening, representative carbonitride particles and dislocation densities were determined in sample areas by transmission electron microscopy.
29 citations
TL;DR: In this paper, a new methodology for modeling precipitation in cast steel is proposed, which consists of two parts: First, a Scheil-Gulliver simulation, which is carried out to obtain information on the amount of microsegregation during solidification, and then, based on this information, two precipitation kinetics simulations are performed: One with the chemical composition representative for the solute-poor core of the secondary dendrite arms, the other with the composition of the residual liquid at a fraction of 5%, corresponding to the segregated soluterich interdendritic regions.
Abstract: In this paper, the kinetics of TiN, V(C,N)) and AlN precipitation in microalloyed steel during continuous casting is investigated experimentally and theoretically. The precipitate phase fraction, mean radius, number density and composition are simulated with the thermo-kinetic software MatCalc and compared with experimental results obtained from transmission electron microscopy analysis. A new methodology for modelling precipitation in cast steel is proposed, which consists of two parts: First, a Scheil – Gulliver simulation, which is carried out to obtain information on the amount of microsegregation during solidification. Then, based on this information, two precipitation kinetics simulations are performed: One with the chemical composition representative for the solute-poor core of the secondary dendrite arms, the other with the composition of the residual liquid at a fraction of 5%, corresponding to the segregated solute-rich interdendritic regions. The results of the computer simulations using the new methodology are in good agreement with experimental observation.
29 citations