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Bainite is a plate-like microstructure that forms in steels at temperatures of 125–550 °C (depending on alloy content). [1] First described by E. S. Davenport and Edgar Bain, [2] [3] it is one of the products that may form when austenite (the face-centered cubic crystal structure of iron) is cooled past a temperature where it is no longer thermodynamically stable with respect to ferrite ...
Martensite in AISI 4140 steel 0.35% carbon steel, water-quenched from 870 °C. Martensite is a very hard form of steel crystalline structure. It is named after German metallurgist Adolf Martens. By analogy the term can also refer to any crystal structure that is formed by diffusionless transformation. [1]
Carbon steel is often divided into two main categories: low-carbon steel and high-carbon steel. It may also contain other elements, such as manganese, phosphorus, sulfur, and silicon, which can affect its properties. Carbon steel can be easily machined and welded, making it versatile for various applications.
Virtually generated microstructure of dual-phase steel. [1]Dual-phase steel (DP steel) is a high-strength steel that has a ferritic–martensitic microstructure. DP steels are produced from low or medium carbon steels that are quenched from a temperature above A 1 but below A 3 determined from continuous cooling transformation diagram.
The 1075 steel is known for high strength, but low toughness, with a pearlitic microstructure, and the 15N20 steel is known for high toughness with a ferritic microstructure. The mechanical properties of the resultant laminate Damascus steel were characterized, in samples with 54 folds in production as well as samples with 250 folds.
Wootz steel is a crucible steel characterized by a pattern of bands and high carbon content. These bands are formed by sheets of microscopic carbides within a tempered martensite or pearlite matrix in higher- carbon steel , or by ferrite and pearlite banding in lower-carbon steels.
In carbon steel, for example, Widmanstätten structures form during tempering if the steel is held within a range around 500 °F (260 °C) for long periods of time. These structures form as a needle or plate-like growths of cementite within the crystal boundaries of the martensite.
The carbon diffusion during the formation of pearlite, just ahead of the growth front, is critical in determining the thickness of the lamellae and, consequently, the strength of the steel [5]. Bainite is a similar structure with lamellae much smaller than the wavelength of visible light and thus lacks this pearlescent appearance.
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