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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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14 Oct 2003
TL;DR: In this article, the authors proposed a tensile strength of 800 MPa or higher for a high-strength steel sheet with a microstructure consisting of one or both of bainite and bainitic ferrite, the secondary phase consisting of austenite, and the balance being ferrite and/or martensite.
Abstract: PROBLEM TO BE SOLVED: To simultaneously improve hydrogen embrittlement resistance, weldability, hole-expandability, and ductility of a high-strength steel sheet having a tensile strength of 800 MPa or higher. SOLUTION: This steel sheet comprises, by mass%, 0.05-0.3% C, 0.01-3.0% Si, 0.01-4.0% Mn, 0.0001-0.020% P, 0.0001-0.020% S, 0.01-3.0% Al, 0.0001-0.01% N, and one or more elements of 0.001-5.5% Ni, 0.001-3.0% Cu, 0.001-5.0% Cr and 0.005-5% Mo, and the balance being iron with unavoidable impurities; has a microstructure comprising the main phase consisting of one or both of bainite and bainitic ferrite, the secondary phase consisting of austenite which occupies an area rate V γ of 3 to 30%, and the balance being ferrite and/or martensite; has a tensile strength TS of 800 MPa or higher; and satisfies the following expressions (1-1) and (1-2): 0≤0.8×{2Cu+20Mo+3Ni+Cr}-{0.1-3.5×10 7 ×(TS) -3.1 }-0.3V γ --- (1-1) and 0≤Si+Al+7.67C-1.78 --- (1-2). COPYRIGHT: (C)2005,JPO&NCIPI
42 citations
TL;DR: In this paper, the abrasive wear behavior of 0.10% to 1.4% carbon steels heat treated to various micro-structures and hardnesses was studied using a pin-on-drum machine.
42 citations
TL;DR: In this article, high strength bainitic steel plates were produced by using thermo-mechanical control and accelerated cooling process to optimize the mechanical properties, and the impact load-deflection curves showed that the boron-free specimens normally have higher peak load and wider deflection than the titanium-boron specimens irrespective of strength.
42 citations
TL;DR: In this article, the authors conduct both experimental examinations and ab initio calculations to seek potential remedies of the metastability of modulated martensitic state through composition tuning, and show that the 7M martensite possesses lower energy barriers in terms of the lattice distortion of parent austenite and the interfacial energy of 7M variants.
42 citations
31 Jul 2017-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, a quench dilatometer was used to estimate the fraction of martensite formed at a given temperature below the start temperature of the martensitic transformation profile, and the measured austenite fractions after quench treatments showed significant differences when compared to the calculated values considering ideal partitioning conditions.
Abstract: In the present work, Quenching and Partitioning (Q&P) heat treatments were carried out in a quench dilatometer on a 0.2 wt% carbon steel. The microstructure evolution of the Q&P steels was characterized using dilatometry, SEM, EBSD and XRD. The martensitic transformation profile was analyzed in order to estimate the fraction of martensite formed at a given temperature below the martensite start temperature Ms. Q&P was shown to be an effective way to stabilize retained austenite at room temperature. However, the measured austenite fractions after Q&P treatments showed significant differences when compared to the calculated values considering ideal partitioning conditions. Indeed, the measured austenite fractions were found to be less sensitive to the quench temperature and were never larger than the ideal predicted maximum fraction. Competitive reactions such as austenite decomposition into bainite and carbide precipitation were found to occur in the present work. Furthermore, a broad range of mechanical properties was obtained when varying the quenching temperatures and partitioning times. The direct contributions between Q&P microstructural constituents -such as retained austenite as well as tempered/fresh martensite- and resulting mechanical properties were scrutinized. This was critically discussed and compared to quenching and austempering (QAT) which is a more conventional processing route of stabilizing retained austenite at room temperature. Finally, Q&P steels were shown to exhibit an interesting balance between strength and ductility. The achievement of this interesting combination of mechanical properties was reached for much shorter processing times compared to QAT steels.
42 citations