How To Use Cementite In A Sentence
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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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Slide 8: Figure 12.3 Electron micrographs of (a) pearlite, (b) bainite, and (c) tempered martensite, illustrating the differences in cementite size and shape among these three microconstituents ( 7500).
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When cooled slowly below 670 degrees, martensite yields a heterogeneous mixture of pearlite and ferrite (or cementite, if the original mixture contained between 0.8 per cent. and two per cent. of carbon).
Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86
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This cementite is hard (Brinell hardness 600 +), brittle and brilliantly white.
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T 10 steel with a starting structure of ferrite and spheroidal cementite wasimployed to undergo laser processing.
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At that moment, in fact, the ferrite, cementite or pearlite which previously existed has lost its identity by everything going into the solid solution called austenite.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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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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When cooled slowly below 670 degrees, martensite yields a heterogeneous mixture of pearlite and ferrite (or cementite, if the original mixture contained between 0.8 per cent. and two per cent. of carbon).
Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86
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It has been shown how the difference in solubility of carbon in austenite and ferrite leads to the familiar ferrite / cementite aggregates in plain carbon steels.
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At that moment, in fact, the ferrite, cementite or pearlite which previously existed has lost its identity by everything going into the solid solution called austenite.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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How stable the carbides are depends on how the element is partitioned between the cementite and the matrix.
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The growth is continually destroyed by the hammering, which should consequently be continued down to the upper critical temperature when the austenite crystals break up into ferrite and cementite.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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In the ordinary practice of hardening steels, the quenching is not so drastic, and the transformation of austenite back to ferrite and cementite is more or less completely effected, giving rise to certain transitory forms which are known as "martensite," "troostite," "sorbite," and finally, pearlite.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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Martensite is usually considered to be a solid solution of cementite in beta iron.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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The dark grains are pearlite, separated by white films of iron carbide (cementite).
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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The carbon absorbed by the iron does not take on a graphitic form, however, as in the case of cast iron, but enters into a chemical compound with the iron, a hard brittle substance called "cementite" by metallurgists.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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Although the softest condition is obtained when the large globules of cementite are embedded in the ferrite, a smooth machined surface is difficult to obtain due to tearing.
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One of these is pure iron, and the other is pure cementite.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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The ferrite _i. e._, the iron is increased in strength by the resistance offered by the cementite which is the simple iron-carbon combination known to metallurgists as Fe3C.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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However, upon cooling this steel, the carbon again enters into combination with a definite proportion of iron (the carbide "cementite," Fe3C), and accumulates into small crystals which can be seen under a good microscope.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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If the steel be then cooled, the austenite breaks up into new crystals of ferrite, cementite and pearlite; and in general if the temperature has not gone far above the critical, and cooling is not excessively slow, a very fine texture will result.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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It is possible to change the relative sizes of the ferrite and cementite crystals by heat treatment.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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The structure now consists of free cementite and pearlite.
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Fig.8 shows the structure of a steel hardened from 760°C, consisting of particles of cementite dispersed in a matrix of martensite.
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Higher carbon steels show films of cementite outlining grains of pearlite (Fig. 48).
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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The cementite, although adding to the tensile strength, is very brittle and the strength of the pearlite is the combination of the ferrite and cementite.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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In the ordinary practice of hardening steels, the quenching is not so drastic, and the transformation of austenite back to ferrite and cementite is more or less completely effected, giving rise to certain transitory forms which are known as "martensite," "troostite," "sorbite," and finally, pearlite.
The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel
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The equilibrium diagram does not tell us what form is taken by the ferrite or cementite ejected from the austenite on cooling.
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When cooled slowly below 670 degrees, martensite yields a heterogeneous mixture of pearlite and ferrite (or cementite, if the original mixture contained between 0.8 per cent. and two per cent. of carbon).
Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86
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T 10 steel with a starting structure of ferrite and spheroidal cementite wasimployed to undergo laser processing.
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The effect of Si on the crystal lattice parameters, lattice volume and crystal defects of the eutectic cementite in malleable cast iron has been studied by using X ray diffractometer and TEM.
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Micro-sections of structural steels carburised for not less than 8 hours at 925°C and slowly cooled to show cementite networks are photographed at a magnification of 100.
