| 单词 | cementite |
| 例句 | I think," said Hoddan, "that we can make an electronic field that'll soften the cementite between the crystals of steel, without heating up anything else. The Pirates of Ersatz In fact, the difference between the hard, brittle cementite and the soft, greasy graphite, accounts for many of the differences between steel and gray cast iron. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel He is then able to pick out its component minerals, ferrite, austenite, martensite, pearlite, graphite, cementite, and to show how their abundance, shape and arrangement contribute to the strength or weakness of the specimen. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries A quickly quenched carbon steel is mostly martensitic which, as noted, is a solid solution of beta iron and Page 113 cementite, hard and brittle. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel As more and more carbon is contained in the alloy—for steel is a true alloy—it begins to appear as graphite, and its properties counteract the remaining brittle cementite. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel The strength of a strictly pearlitic steel over a pure iron is due to the pearlitic being a layer arrangement of cementite running parallel to that of a pure iron layer in each individual grain. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel 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 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 Chromium when alloyed with steel, has the characteristic function of opposing the disintegration and reconstruction of cementite. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel A final steel will be composed of pearlite; ferrite and pearlite; or cementite and pearlite, according to the carbon content. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel But we may anticipate by saying that some of the iron unites with all the carbon to form a new substance, very hard, a carbide which has been called "cementite." The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel From this combination, we are able to get a very strong ferrite matrix and a very hard tough cementite. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel Many of the properties of steel, as they vary with carbon content, can be linked up with the increasing amount of this hard carbide cementite, distributed in very fine particles through the softer iron. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel 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 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 Apparently the quick cooling prevents the normal change back to definite and sizeable crystals of ferrite and cementite. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel 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 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 At that moment, in fact, the ferrite, cementite or Page 110 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 Subsequent cooling gives a coarse texture, or an arrangement of ferrite, cementite and pearlite grains which is greatly coarsened, reflecting the condition of the austenite crystals from which they were born. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel Where poor machining conditions in heat-treated steels are present they are generally due to incomplete solution of cementite rather than bands of free ferrite, as in the case of case-hardening steels. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel Pearlite is a definite conglomerate of ferrite and cementite containing about six parts of the former to one of the latter. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel The treatment is more delicate, due to the higher percentage of carbon and the natural increase in cementite together with complex carbides which are present in some of the higher types of alloys. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel |
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