Topic
Bainite
About: Bainite is a research topic. Over the lifetime, 9520 publications have been published within this topic receiving 145305 citations.
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TL;DR: In this article, the phase transformation between the high temperature FCC-phase austenite and the low temperature BCC-phase ferrite as it occurs during controlled cooling of hot rolled low carbon steels is described using a physical model that considers Austenite grain size, nucleus density, composition effects, and the AU/ferrite interface mobility.
Abstract: The kinetics of the phase transformation between the high temperature FCC-phase austenite and the low temperature BCC-phase ferrite as it occurs during controlled cooling of hot rolled low carbon steels is described using a physical model that considers austenite grain size, nucleus density, composition effects, and the austenite/ferrite interface mobility. The model is verified against experimental dilatometry data for three lean carbon-manganese steel grades. The model yields adequate reproductions of the transformation kinetics. Ferrite grain coarsening during the transformation appears to have a significant effect on the final microstructure.
48 citations
TL;DR: In this article, the martensite transformation causes a considerable shear of layers, but, in order to release it, a new phase transformation occurs in the matrix neighbouring the martENSites.
Abstract: Martensite transformation in the NiTi alloy has been studied by selected area electron diffraction. The martensites have such close packed layer structures as 4H (2\bar2) and 12 R (3\bar1) 3 . The 2H and 18R martensites are also sometimes observed. The 12R martensite appears dominantly at room temperature but the 4H martensite is formed below 0°C. They are closely connected with each other through stacking faults. The martensite transformation causes a considerable shear of layers, but, in order to release it, a new phase transformation occurs in the matrix neighbouring the martensites. By cold work, the 4H martensite and the new phase are also produced. The present results make crystallographically clear the nature of the martensite transformation in the NiTi alloy. On the basis of the results, mechanism of the memory effect in the alloy is interpreted. Origin of the memory effect in metals and alloys are also discussed.
48 citations
TL;DR: A hot stamping process was experimentally simulated by a hot deformation dilatometer to investigate phase transformations and final properties of 22MnB5 boron bearing steel as discussed by the authors.
48 citations
Patent•
05 Oct 2005
TL;DR: A high strength thin steel plate, characterized in that it has a chemical composition, in mass %, that C: 0.03 to 0.25 %, Si: Si 0.4 to 2.0 %, N ≤ 0.02 %, S ≥ 0.01 % and the balance: Fe, and a microstructure wherein ferrite was 10 to 85 area %, retained austenite is 1 to 10 vol %, tempered martensite is 10 to 60 area % and balance is bainite; and a method for producing the above high strength
Abstract: A high strength thin steel plate, characterized in that it has a chemical composition, in mass %, that C: 0.03 to 0.25 %, Si: 0.4 to 2.0, Mn: 0.8 to 3.1 %, P ≤ 0.02 %, S ≤ 0.02 %, Al ≤ 2.0 %, N ≤ 0.01 % and the balance: Fe, and a microstructure wherein ferrite is 10 to 85 area %, retained austenite is 1 to 10 vol %, tempered martensite is 10 to 60 area %, and the balance is bainite; and a method for producing the above high strength thin steel plate on an industrial scale. The above high strength thin steel plate has a tensile strength of 500 MPa or more, and also is excellent in elongation and bore expanding characteristics.
47 citations
TL;DR: In this article, the authors investigated the microstructural evolution of high strength low alloy steel, Fe 2.0Mn-0.15Si−0.05C (wt.
47 citations