Perhaps the most familiar structure in steels is that of the eutectoid pearlite, usually a lamellar mixture of ferrite and cementite. |
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The harder pearlite is comprised of alternating thin layers or shells of ferrite and cementite, a very hard substance. |
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This reduces the amount of pearlite and improves toughness, ductility, and weldability. |
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It is important to note that higher silicon contents can promote pearlite and may increase the nickel requirement. |
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Ductility and impact properties are principally determined by the proportions of ferrite and pearlite in the matrix. |
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The properties obtained subsequently depend on the coarseness of the pearlite and ferrite and their relative distribution. |
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The structure is illustrated in Fig.4 from the Cast Iron article which shows the structure of the phosphide eutectic, together with graphite, ferrite and pearlite. |
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For the high-silicon nodular irons, high-temperature heat treatment is advised in all cases to anneal any pearlite and stabilize the casting against growth in service. |
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The products of the transformation, whether ferrite, pearlite or bainite, are partly determined from isothermal diagrams, and can be confirmed by metallographic examination. |
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The ferrite grains were uniaxial in nature, whereas, the pearlite grains were elongated, as a result of metal working. |
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These crystals are characterised by a troostite structure, with individual areas of plate-shaped pearlite. |
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The change of the minimum cooling rate to prevent the formation of pearlite was linked to the content of the main alloying elements. |
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I add grit to a few handfuls of compost for the bottom of the pot and a handful of pearlite to the top. |
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The steel can then be tempered by reheating to a temperature in between, changing the proportions of pearlite and martensite. |
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The microstructure of the matrix shows large grains of pearlite in a matrix of ferrite. |
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Some consider granular pearlite or granular cementite to be sorbite. Hence it is also called sorbitic pearlite, and when referring to the contained carbon, sorbitic carbide. |
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The two, ferrite and cementite, precipitate simultaneously producing a layered structure called pearlite, named for its resemblance to mother of pearl. |
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