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Cementite or iron carbide is a chemical compound with the formula Fe3C (or Fe2C:Fe), and an orthorhombic crystal structure. It is a hard, brittle material, normally classified as a ceramic in its pure form, though it is more important in metallurgy. It forms directly from the melt in the case of white cast iron. In carbon steel, it either forms from austenite during cooling or from martensite during tempering. An intimate mixture with ferrite, the other product of austenite, forms a lamellar structure called pearlite. Much larger lamellae, visible to the naked eye, make up the structure of Damascus steel. Cementite changes from ferromagnetic to paramagnetic at its Curie temperature of approximately 480 K. A natural iron carbide (containing minor amounts of nickel and cobalt) occurs in iron meteorites and is called cohenite after the German mineralogist Emil Cohen, who first described it. From Wikipedia under the
GNU Free Documentation License what is the difference between primary ,secondary & tertiary cementite? Q. what is the difference between primary ,secondary & tertiary cementite? Asked by rajev v - Mon Jul 2 05:07:03 2007 - - 2 Answers - 0 Comments A. IDK Answered by Cin Reaper - Tue Jul 10 04:11:06 2007 Why is cementite stronger than ferrite? Q. regarding structure, factors concerned... Asked by hello!!!! - Mon May 18 02:59:00 2009 - - 1 Answers - 0 Comments A. It isn't. Ferrite a A LOT stronger then Cementite (Iron Carbide) in terms of tensile strength (which is generally how such things are measured). Ferrite has a tensile strength of around 280 N/mm^2 Cementite has a tensile strength of around 35 N/mm^2 Answered by GEadon - Mon May 18 19:41:33 2009 Define : Austenite, Ferrite,Cementite
Q. Define : Austenite, Ferrite,Cementite Asked by ankit d - Sun Aug 3 10:07:38 2008 - - 2 Answers - 0 Comments From Yahoo Answer Search: "Cementite"  rocketmadness.com ryan_1000R Fri, 10 Nov 2006 21:11:30 GM when this local temperature reaches around 1200 or 1300 degrees f. the cast iron under the deposit begins to transform into . cementite. (an iron carbide in which three atoms of iron combine with one atom of carbon). . cementite. is very hard ...  chemical-quantum-images.blogspot.com Felix Wed, 04 Apr 2007 15:36:00 GM in steel there is ferrite (iron with a little bit of c dissolved) and metastable . cementite. fe3c. those are probably the two phases above but it's hard to really see something. we etched the cast iron with nital solution (nitric acid in ...  stonepanmin.blog.sohu.com Sat, 12 May 2007 08:08:33 GM pearlite+. cementite. +small percentage graphite. NiCrMo indefinite chilled cast iorn rolls . pearlite+. cementite. +small percentage graphite. NiCrMo indefinite chilled cast iron rolls . fine pearlite+. cementite. +small percentage ... From Google Blog Search: "Cementite"  news.google.com Examiner.com The 'cooked'-on pad material is called cementite , and it is pretty much permanent, where no amount of resurfacing can remove it. ... news.google.com Hindu "The presence of high amount of iron carbide also called ' cementite ' renders these rails susceptible to corrosion," he explained. ... and more » From Google News Search: "Cementite"  msm.cam.ac.uk 284px x 543px | 31.70kB [source page] X ray diffraction pattern of cementite  corusgroup.com 390px x 480px | 159.00kB [source page] Steel Micro Structure Cementite  msm.cam.ac.uk 606px x 809px | 220.80kB [source page] Up Next > Fe 1 75C 2Si 1Mn wt Austenitised at 1393 K for 4 h and quenched into water Shows fine pearlite growing from proeutectoid cementite at the austenite grain boundaries The white phase is From Yahoo Image Search: "Cementite" |
