Harper John Posted June 10, 2009 Share Posted June 10, 2009 Hi, I am making this post because despite having read many books on metallurgy, I still have difficulty in understanding martensite and whether it has something that resembles a granular structure and grain size. I have often been told that martensite does not have a grain size nor form grains, yet the literature is replete with references to grain size, especially when describing martensitic fracture surfaces. I have read that martensite begins to from at the grain boundaries of austenite, grow inwards and a single plate can reach across the whole of the grain. However, can this plate, once it reached a grain boundary grow beyond it? If not, then surely the former austenite grain boundaries will determine the orientation and size of the martensite laths or plates, and thus effectively form grains of marteniste. Another thought that has occurred to me is that carbides and impurities that have segregated at the austenitic grain boundaries will probably remain in place after the martensitic transformation, further demarcating areas of martensite from each other and lending it a granular character. Is this the case? Now, not being a metallurgist, all this is mere supposition on my behalf and would greatly appreciate if someone here could either offer me a comprehensive explanation or else direct me to some literature that does so. Thanking all who may care to answer, Cheers John Link to comment Share on other sites More sharing options...
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