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, phase-field modelling is used to simulate the quenching and partitioning process in a low-carbon transformation-induced plasticity (TRIP) steel, in order to understand the carbon redistribution in the microstructure during the heat treatment.
50 citations
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TL;DR: The carbon concentration trapped in the films of austenite between parallel platelets of bainite is often found to be much larger than that in the larger blocks of the same material as mentioned in this paper.
Abstract: The carbon concentration trapped in films of austenite between parallel platelets of bainite is often found to be much larger than that in the larger blocks of austenite between sheaves of bainite. The effect of this non-uniform distribution of carbon on the overall transformation kinetics of bainite is examined theoretically. It is found that the trapping of carbon in the films of austenite accelerates the bainite transformation. This effect increases with increasing film thickness and with decreasing average carbon concentration.MST/1628
50 citations
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TL;DR: In this paper, the authors investigated the potential influence of the interlath retained austenite on the mechanical behavior of lath martensite subgrains. But their main contribution is the validation of the hypothesis on the role of the retained Austenite in lath Martensite using the experimental results reported in the literature.
Abstract: Lath martensite reveals a specific hierarchical subgrain structure, with laths, blocks and packets of particular crystallography. The presence of interlath retained austenite layers has been reported in the literature. This paper investigates the potential influence of the interlath retained austenite on the mechanical behaviour of lath martensite subgrains. To this purpose, a martensite grain substructure is modelled using a crystal plasticity framework, with a BCC lath–FCC austenite bicrystal at the fine scale. The main novel contribution of this work is the validation of the hypothesis on the role of the interlath retained austenite in lath martensite using the experimental results reported in the literature. The main features of the experimentally observed deformation behaviour (stress–strain curve, slip activity and roughness pattern) are qualitatively well reproduced by the model. It is shown that the presence of austenite interlath films has the potential to remarkably enhance the local deformation of martensite. In spite of its minor volume fraction, it plays a major role in the orientation dependent mechanical behaviour of the aggregate. It is also shown that if the presence of interlath austenite is neglected, the observed experimental flow curves are not captured.
50 citations
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06 Dec 2002
TL;DR: In this paper, a high strength steel plate has a composition containing, by mass, 0.05 to 0.6% C, 0,5 to 3% Si+Al, 0.,15% (not including 0%) P and ≤ 0.02% S. This steel plate had a matrix phase structure containing bainitic ferrite and/or granular bainite having an average hardness of ≤240 Hv Vickers hardness in an amount of ≥70% by space factor based on the whole structure and also has a secondary phase structure which contains retained austenite
Abstract: PROBLEM TO BE SOLVED: To provide a high strength steel plate combining excellent elongation characteristics and stretch-flangeability by warm working. SOLUTION: The high strength steel plate has a composition containing, by mass, 0.05 to 0.6% C, 0.5 to 3% Si+Al, 0.5 to 3% Mn, ≤0.15% (not including 0%) P and ≤0.02% (not including 0%) S. This steel plate has a matrix phase structure containing bainitic ferrite and/or granular bainitic ferrite having an average hardness of ≤240 Hv Vickers hardness in an amount of ≥70% by space factor based on the whole structure and also has a secondary phase structure which contains retained austenite in an amount of 5 (preferably 8) to 30% by space factor based on the whole structure, wherein C concentration (Cγ R ) in the retained austenite is made to ≥1.0%, and further bainite/martensite can be contained. COPYRIGHT: (C)2004,JPO&NCIPI
50 citations
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20 Aug 2010-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the authors compared the tensile, impact and hardness properties of three types of microstructures, full bainite, Bainite-ferrite and tempered Bainites-Ferrite, and found that tempering of Bainsite-34% ferrite dual phase steel increased the strength and toughness of these microstructures.
Abstract: To improve both strength and toughness of AISI 4340 steel three microstructures, full bainite, bainite–ferrite and tempered bainite–ferrite, were produced by heat treatment of this steel. Tensile, impact and hardness properties of these microstructures were compared. The results showed that with tempering of bainite–34% ferrite dual phase steel, elongation and charpy impact energy increased significantly in comparison to bainite and bainite–ferrite microstructures. Also ductile-brittle transition temperatures of bainite–ferrite and tempered bainite–ferrite steels were measured and confirmed superior toughness properties of this microstructure. Fracture surface analysis of charpy specimens also showed increase in toughness of tempered bainite–ferrite in comparison to bainite–ferrite and full bainite microstructures. Radial marks, shear lip areas and crack initiation site region in fracture surfaces of three mentioned microstructures were also considered and compared.
50 citations