cementite वाक्य
उदाहरण वाक्य
मोबाइल
- The proportion of ferrite and cementite forming above the eutectoid point can be calculated from the iron / iron carbide equilibrium phase diagram using the lever rule.
- The eutectic mixture of austenite and cementite is 4.3 % carbon, Fe 3 C : 2Fe, with a melting point of 1147 �C.
- Tungsten slows the formation of cementite, keeping carbon in the iron matrix and allowing martensite to preferentially form at slower quench rates, resulting in high speed steel.
- Upon cooling slowly, the solution of iron and carbon, ( a single phase called austenite ), will separate into platelets of the phases ferrite and cementite.
- The rate at which the steel is cooled through the eutectoid temperature ( about 727�C ) affects the rate at which carbon diffuses out of austenite and forms cementite.
- The eutectoid composition of austenite is approximately 0.76 % carbon; steel with less carbon content ( hypereutectoid steels ) will form cementite before reaching the eutectoid point.
- If tempered at higher temperatures, between and, or for longer amounts of time, the martensite may become fully ferritic and the cementite may become coarser or spheroidize.
- The end product below 0.8 % carbon content is a pearlite-ferrite mixture, and that above 0.8 % carbon content is a pearlite-cementite mixture.
- Elemental silicon is added to molten cast iron as ferrosilicon or silicocalcium alloys to improve performance in casting thin sections and to prevent the formation of cementite where exposed to outside air.
- A team of researchers based at the Technical University of Dresden that uses X-rays and electron microscopy to examine Damascus steel discovered the presence of cementite nanowires and carbon nanotubes.
- For instance, in the iron-carbon system, the austenite phase can undergo a eutectoid transformation to produce ferrite and cementite, often in lamellar structures such as pearlite and bainite.
- If the steel is cooled slowly the transformation will agree with the equilibrium predictions and pearlite will dominate the microstructure with some fraction of proeutectoid ferrite or cementite depending on the chemical composition.
- HSLA steels are also more resistant to rust than most carbon steels because of their lack of pearlite the fine layers of ferrite ( almost pure iron ) and cementite in pearlite.
- In fact, the lamellar appearance is misleading since the individual lamellae within a colony are connected in three dimensions; a single colony is therefore an interpenetrating bicrystal of ferrite and cementite.
- In contrast to pearlite, where the ferrite and cementite grow cooperatively, bainite forms by the transformation of carbon-supersaturated ferrite with the subsequent diffusion of carbon and the precipitation of carbides.
- Most alloying elements ( solutes ) have the benefit of not only increasing hardness, but also lowering both the martensite start temperature and the temperature at which austenite transforms into ferrite and cementite.
- In the second stage, occurring between and, the retained austenite transforms into a form of lower-bainite containing ?-carbon rather than cementite ( archaically referred to as " troostite " ).
- Ledeburite-II ( at ambient temperature ) is composed of cementite-I with recrystallized secondary cementite ( which separates from austenite as the metal cools ) and ( with slow cooling ) of pearlite.
- Ledeburite-II ( at ambient temperature ) is composed of cementite-I with recrystallized secondary cementite ( which separates from austenite as the metal cools ) and ( with slow cooling ) of pearlite.
- One way for carbon to leave the austenite is for it to precipitate out of solution as cementite, leaving behind a surrounding phase of BCC iron called ferrite with a small percentage of carbon in solution.
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