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Pearlite
About: Pearlite is a research topic. Over the lifetime, 6028 publications have been published within this topic receiving 65695 citations.
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25 Sep 2002-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, an ultrahigh carbon steel containing 1.3 wt.% C (UHCS-1.3C) was processed to obtain spheroidized and pearlitic microstructures.
Abstract: An ultrahigh-carbon steel containing 1.3 wt.% C (UHCS-1.3C) was processed to obtain spheroidized and pearlitic microstructures. Spheroidized microstructures exhibit carbide particle size and ferrite grain size distributions which are invariable with austenitizing temperature below 870 °C. Pearlitic microstructures exhibit prior austenite grain sizes and pearlite colony sizes which increase and interlamellar spacings which decrease with increasing austenitizing temperatures above 870 °C. Plane-strain fracture toughness, K Iv , was measured at room temperature for all heat-treated materials. In the case of spheroidized UHCS-1.3C, fracture toughness does not change significantly with austenitizing temperature. The fracture toughness of UHCS-1.3C processed for pearlitic microstructures decreases with increasing austenitizing temperature. Austenite grain size, pearlite colony size, and interlamellar spacing are evaluated for influence on the fracture toughnesses associated with pearlitic microstructures. It is found that the primary microstructural parameter controlling fracture toughness is the cleavage facet size, which typically spans several pearlite colonies. The size of cleavage facet size is primarily controlled by the austenite grain size. The influences of pearlite colony size and interlamellar spacing are minor.
40 citations
TL;DR: In this paper, the application of high intensity electric pulse (HIEP) to a severely deformed eutectoid microstructure in high carbon steel wire has resulted in spheroidized microstructures.
Abstract: Application of high intensity electric pulse (HIEP) to a severely deformed eutectoid microstructure in high carbon steel wire has resulted in spheroidized microstructure. The observed spheroidization on electropulsing is compared with that reported for isothermal/thermo-mechanical annealing of the pearlite structure. The faster kinetics observed in this study has been rationalized in terms of accelerated kinetics induced by HIEP.
40 citations
Journal Article•
TL;DR: The solidification structures of cast Fe-B-C alloy containing more than 2.0%B and lower than 0.2%C and the structures and properties of alloy after heat treatment were researched by means of optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), hardness measurements, impact tester and pin abrasion tester.
Abstract: The solidification structures of cast Fe-B-C alloy containing more than 2.0%B and lower than 0.2%C and the structures and properties of alloy after heat treatment were researched by means of optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), hardness measurements, impact tester and pin abrasion tester. The results show that the solidification structures of cast Fe-B-C alloy consist of boride (Fe2B), pearlite and ferrite, and boride distributes along grain boundary in network form. After normalizing at 950℃, the part broken network of boride in cast Fe-B-C alloy appeared, the matrix all transformed into lath martensite. The hardness of cast Fe-B-C alloy increased obviously and neared to HRC 60, its impact toughness and dynamic fracture toughness exceeded 10 J/cm2 and 30 MPa·m1/2, respectively. In the condition of pin-on-disk wear, cast Fe-B-C alloy showed excellent abrasion resistance. Its abrasion resistance is more excellent than that of Ni-hard white cast iron, GCr15 and Cr12MoV, nears to that of high chromium white cast iron. Cast Fe-B-C alloy has simple melting process and good casting property, does not contain costly nickel and molybdenum elements and so has low production cost.
40 citations
TL;DR: In this article, three as-thermomechanically controlled rolled (TMCR) microalloyed steels containing Nb levels between 0.023 and 0.057 wt% have been characterised in terms of phase balance and ferrite grain size distribution (optical microscopy and image analysis).
Abstract: Three as-thermomechanically controlled rolled (TMCR) microalloyed steels containing Nb levels between 0.023 and 0.057 wt% have been characterised in terms of phase balance and ferrite grain size distribution (optical microscopy and image analysis). In addition, transmission electron microscopy (TEM) has been carried out on carbon extraction replicas from sub-surface and mid-thickness positions to determine fine precipitate size distribution and areal number density in ferrite and pearlite. Precipitate distributions were also determined after simulated re-heating schedules. The ferrite grain size distributions have been related to precipitate distributions and rolling schedules, whilst the development of precipitate distributions has been considered based on solidification, reheating and deformation behaviour.
40 citations
TL;DR: An extremely fine, fully pearlitic structure with an interlamellar spacing of 30-50nm has been obtained during continuous cooling transformation at a rate as low as 0.1°C ǫ s−1, of the steel that is normally used to produce nanostructured bainite as discussed by the authors.
40 citations