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- W2228155485 abstract "In metallography the shape of high carbon martensite is commonly considered to be lens-like in three dimensions,which is of needle or bamboo leaf on the OM micrographs of section planes.However,a round martensite on OM micrographs have never been seen so far.This question has not been answered over the years.It has not been theoretically explanined why is martensite lath-like for low carbon steels and lens-like for high carbon steels on OM micrographs.For answering these questions,the martensitic morphology of a steel with carbon content 1.37%was observed in the same view by OM using a method of multiple sectioning of one sample.The length,width of the aimed martensite and sectioned thickness of samples were measured before observing.It is found that the martensite is a flat ellipsoid rather than lens-like as described in traditional textbooks.The ratio of a/b is about 3 and a/c is about 20 for the martensite ellipsoid.The thermal dynamic analysis indicates that the nucleation energy for a martensite is closely related to its shape.In the austenite with the same grain size,the nucleation energy(ΔG~*) of martensite will be lower with ellipsoid shape than with lens shape.The driving force for martensitic transformation will reduce with the decrease of carbon content,resulting in the formation of lath-like martensite in steels with low carbon content." @default.
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- W2228155485 date "2010-08-25" @default.
- W2228155485 modified "2023-09-24" @default.
- W2228155485 title "A STUDY OF MARTENSITIC MORPHOLOGY BY PARAL-LEL MULTIPLE--LAYERS SECTIONING" @default.
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- W2228155485 doi "https://doi.org/10.3724/sp.j.1037.2010.00007" @default.
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