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: Strip rolling simulations were carried out on a 0.06%C-0.3%Mn- 0.01%Si and a0.11% C-1.0%Al 0.034%Nb steel over the temperature range 1 000°C to 883°C.
Abstract: Strip rolling simulations were carried out on a 0.06%C-0.3%Mn-0.01%Si and a 0.11%C-1.0%Mn0.11%Si-0.03%Al-0.034%Nb steel over the temperature range 1 000°C to 883°C. Pass strains of 0.4 were applied at a strain rate of 1 s with interpass times of 0.5 s, 1 s, 1.5 s, 3 s and 5 s. Two different temperature schedules were employed, namely i) continuous cooling at 6°C/s and ii) isothermal holding. The mean flow stresses (MFS’s) applicable to strip rolling were determined by integration. The flow stress levels and MFS’s decrease when the interpass times are short. When they are long, the flow stress increases with decreasing temperature. These observations indicate that the austenite is transforming dynamically into ferrite and statically into austenite. The nucleation and growth of the ferrite reduce the rolling load and modify the microstructure. The addition of Nb in solid solution delays the occurrence of dynamic transformation (and the retransformation of ferrite back into austenite). The forward nucleation of ferrite occurs displacively while the retransformation back into austenite takes place by a diffusional mechanism.
28 citations
Journal Article•
TL;DR: In this paper, the micro-alloying was used to improve the performance of the microalloyed micro-manufacturing process in the U.S., with an accuracy of 18% ～ 23%.
28 citations
TL;DR: In this paper, a new nickel-titanium (NiTi) shape memory alloy (SMA) fiber was manufactured to investigate its effects on the fresh and mechanical properties of SMA fibre-reinforced SCC and comparing it with polypropylene (PP) fibre and steel fibre reinforced SCC.
28 citations
TL;DR: In this paper, an attempt to fabricate the oxide film with magnetite precipitates from thermally-grown wustite (Fe 1− x O) layer during isothermal cooling of low carbon microalloyed steel, was obtained.
28 citations
TL;DR: In this article, the coarse-grained heat-affected zone (CGHAZ) microstructure and crack tip opening displacement (CTOD) toughness of grade StE 355 Ti-microalloyed offshore steels were investigated.
Abstract: The present study has been carried out to investigate the coarse-grained heat-affected zone (CGHAZ) microstructure and crack tip opening displacement (CTOD) toughness of grade StE 355 Ti-microalloyed offshore steels. Three parent plates (40-mm thick) were studied, two of which had Ti microalloying with either Nb + V or Nb also present. As a third steel, conventional StE 355 steel without Ti addition was welded for comparison purposes. Multipass tandem submerged arc weld (SAW) and manual metal arc weld (SMAW) welds were produced. Different heat-affected zone (HAZ) microstructures were simulated to ascertain the detrimental effect of welding on toughness. All HAZ microstructures were examined using optical and electron microscopy. It can be concluded that Ti addition with appropriate steel processing, which disperses fine TiN precipitates uniformly, with a fine balance of other microalloying elements and with a Ti/N weight ratio of about 2.2, is beneficial for HAZ properties of StE 355 grade steel.
28 citations