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: In this article, the effect of cooling rate on the microstructure and hardness of a kind of medium carbon steel microalloyed with two levels of V content (0.15% and 0.28%) after hot deformation by using single compression tests on a Gleeble-3800 thermal simulator was reported.
39 citations
TL;DR: In this paper, the effect of grain size on isothermal bainite transformation in a low carbon microalloyed steel was studied by means of optical microscopy, SEM and TEM.
Abstract: The effect of austenite grain size on isothermal bainite transformation in a low carbon microalloyed steel was studied by means of optical microscopy, SEM and TEM. Two widely varying austenite grain sizes, a fine average grain size (∼20 μm) and a coarse average grain size (∼260 μm), were obtained by different maximum heating temperatures. The results showed that the morphology of isothermal microstructure changes from bainite without carbide precipitation to bainitic ferrite with a decrease in holding temperature. Coarse austenite grain can retard the kinetics of bainite transformation and increase the incubation time of bainite transformation by reducing the number of nucleation site, but it does not influence the nose temperature of the C curve of bainite start transformation, which is ∼534°C.
39 citations
25 Apr 2007-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: The continuous cooling transformation (CCT) microstructure evolution in low carbon Mo-Nb-Cu-B microalloying steel (LCS) was investigated by thermo-simulation test.
Abstract: The continuous cooling transformation (CCT) microstructure evolution in low carbon Mo–Nb–Cu–B microalloying steel (LCS) was investigated by thermo-simulation test. It was found that the full multi-phase of intermediate transformation products could be obtained at cooling rate greater than approximately 2 °C/s. In order to get bainitic microstructures, the thermo-mechanical control process (TMCP) was worked out according to CCT microstructure characteristics. After TMCP, 750 MPa grade steel twice over that of weathering steel 09CuPCrNi (WS) with ferrite and pearlite structures could be achieved. The corrosion behaviors of LCS and WS were also studied by wet-dry cycle corrosion test. The results showed that LCS had higher corrosion resistance than WS, attributed to suppression of the formation of pearlite.
39 citations
TL;DR: AISI 5140 low-alloy steel is ion-nitrided under different process parameters, including time (1, 4, and 8 h), temperature (450, 500, and 550 °C), and various gas mixtures at a working pressure of 5 mbar as discussed by the authors.
38 citations
TL;DR: In this article, hot torsion tests are carried on three plain carbon steels and a Nb microalloyed steel of increasing C concentrations, at strain rates up to 4's−1 and over the temperature range 743-917°C.
Abstract: Hot torsion tests are carried on three plain carbon steels and a Nb microalloyed steel of increasing C concentrations. The tests are performed at strain rates up to 4 s−1 and over the temperature range 743–917°C. The onsets of dynamic transformation (DT) and dynamic recrystallization (DRX) are detected using the double-differentiation method. Both mechanisms are initiated under all testing conditions but one. The critical strain for DT increases with temperature while the reverse dependency is exhibited by the critical strain for DRX.
38 citations