Topic
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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26 Oct 2017-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, extremely fine pearlitic steels with mean true inter-lamellar spacing of 110nm and 63nm while having yield strength of 0.79 GPa and 1.08 GPa respectively have been produced by suitable alloying and appropriate undercooling to enhance the free energy available for transformation.
Abstract: Microstructural refinement to the nanoscale imparts tremendous strength to metals while following the Hall-Petch relationship. However, most manufacturing methods to make nanostructured metals are limited by the maximum size of the final product. Extremely fine pearlitic steels with mean true inter-lamellar spacing of 110 nm and 63 nm while having yield strength of 0.79 GPa and 1.08 GPa respectively have been produced by suitable alloying and appropriate undercooling to enhance the free energy available for transformation. The stronger pearlite shows enhanced plane strain fracture toughness thus offering a combination of high damage resistance and tolerance.
30 citations
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TL;DR: In this paper, a new model is presented that uses a recent description of the conditions to be fulfilled for the ferritic and pearlitic reactions to start, based upon the knowledge of the relevant phase diagram.
Abstract: The so-called eutectoid reaction of spheroidal graphite cast irons (SGI) )proceeds by competitive nucleation and growth of ferrite and pearlite. In the present study are first reviewed the physical models of the ferritic reaction in SGI previously described in the literature. Then, a new model is presented that uses a recent description of the conditions to be fulfilled for the ferritic and pearlitic reactions to start. This description is based upon the knowledge of the relevant phase diagram. Growth of the ferrite halos during the ferritic reaction is described as controlled by carbon transfer from the austenite/ferrite interface to the graphite nodules and by an interfacial reaction at the ferrite/graphite interface. Modelling of the pearlitic reaction accounts for nucleation of pearlite colonies, and their growth law is expressed according to experimental data available in the literature. It appeared also necessary to describe the diffusion of carbon in austenite before the beginning of the decomposition of this phase. Predictions are compared to experimental transformation kinetics obtained by means of differential thermal analysis on spheroidal graphite Fe-C-Si alloys, and could be easily extended to alloys with low level additions of pearlite promoter elements.
30 citations
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TL;DR: A review of past works on the formation of ferrite and pearlite in nodular cast iron is presented in this paper, where the effects of cooling rate after solidification and of nodule count are stressed.
Abstract: A review of past works on the formation of ferrite and pearlite in nodular cast iron is proposed. The effects of cooling rate after solidification and of nodule count on the formation of both constituents are stressed, though much emphasis is put on alloying elements and impurities.
30 citations
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TL;DR: In this article, atom probe tomography was performed to study cementite dissolution as a function of the strain state of pearlite colonies with respect to the applied external strain in severely drawn pearlite steels.
30 citations
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TL;DR: In this paper, the effect of microstructures on the rolling contact fatigue (RCF) of high-speed-railway was studied under a simulated train speed of 500 km/h.
30 citations