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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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TL;DR: In this paper, atomic force microscopy (AFM) was employed to investigate pearlitic steels lead patented at 510 °C and then cold drawn to 86% reduction in area, on which measurements of minimum interlamellar spacing in good agreement with spacings estimated using the Embury-Fisher model were easily performed.
Abstract: Pearlite interlamellar spacing is an important parameter controlling ductility and strain hardening of carbon steels. Fine pearlite is the appropriate initial microstructure for drawing high carbon steel with exponential strain hardening rate, leading to high final tensile strengths. The majority of optical and electron microscopy methods for measuring interlamellar spacing present difficulties when applied to fine microstructures. Atomic force microscopy (AFM) was employed to investigate pearlitic steels lead patented at 510 °C and then cold drawn to 86% reduction in area. Conventional specimen preparation techniques for optical metallography were appropriated to produce high resolution AFM images, on which measurements of minimum interlamellar spacing, in good agreement with spacings estimated using the Embury–Fisher model, were easily performed.
34 citations
15 Aug 2004-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the decomposition behavior of residual austenite in hot-rolled 0.2C-1.5Mn-2Si transformation induced plasticity (TRIP)-aided steels was investigated.
Abstract: Laboratory simulation of hot rolling and coiling processes and in situ heating observations have been carried out in order to evaluate the decomposition behavior of the residual austenite in hot rolled 0.2C–1.5Mn–2Si transformation induced plasticity (TRIP)-aided steels. Residual austenite was thermally stable up to 350 °C and then decomposed into various phases depending on the coiling temperatures: carbide-free bainitic ferrite, ferrite associated with cementite and pearlite. The difference of these decomposition behaviors will be discussed in terms of the variation of carbon concentration and thermal stability of the residual austenite depending on coiling temperatures and holding times.
34 citations
TL;DR: The formation of fine ferrite grains by the asymmetric rolling of low carbon steel and their mechanical properties were studied in this article, where a super-cooled low carbon austenite was deformed at 750°C with a roll size ratio of 1.5 and immediately cooled at various cooling rates.
34 citations
TL;DR: In this article, the transformation modes for ferrite, pearlite, bainite, and interface NbC precipitation were derived based on the experimental and the theoretical approaches, and the results showed that Nb is a strong carbide forming element such as Nb, V, Ti, and Mo, whereas matrix precipitation in ferrite is prevailed when the growth rate is fast.
34 citations
TL;DR: In this article, the spheroidization of cementite at subcritical and intercritical temperatures was studied quantitatively by evaluation of a shape factor for the cementite particles, and it was found that the degree of spherodeization, as determined by the values of the shape factor, was markedly accelerated by treatments consisting in either (1) subcritical annealing after cold deformation or (2) intercritical anealing followed by subcritical reformation, while some differences were found among the microstructures resulting from the above treatments, which were related to
Abstract: The spheroidization of cementite at subcritical and intercritical temperatures was studied quantitatively by evaluation of a shape factor for the cementite particles. It was found that the degree of spheroidization, as determined by the values of the shape factor, was markedly accelerated by treatments consisting in either (1) subcritical annealing after cold deformation or (2) intercritical annealing followed by subcritical annealing. Nevertheless, some differences were found among the microstructures resulting from the above treatments, which were related to the mechanisms of cementite formation in each of them. Also, the kinetics of austenitization during intercritical annealing was found to be accelerated by previous deformation, and the analysis of the formation of austenite at intercritical temperatures in terms of an Avrami equation was consistent with an "effective" saturation of ferrite-pearlite boundaries with austenite nuclei, followed by a planar mode of growth into the pearlite nodules.
34 citations