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Szymańska, Agnieszka
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article
Phase transformations in ball milled AISI 316L stainless steel powder and the microstructure of the steel obtained by its sintering
Abstract
<p>The paper shows the influence of the 100 hours ball milling process of commercial AISI 316L stainless steel powder and the mixture of powders of its components eg. (Fe, Cr, Ni...) on the structure on the milling products. The impulse plasma sintering process of the powders has also been carried out. The results of X-ray diffractometry showed that ball milling in both cases leads to obtaining nanocrystalline two phase (austenitic-martensitic) stainless steel powders of the average size of crystallite about 40 nm. The fraction of martensite in the milled powders was estimated from Mössbauer spectra and their microstructure was observed on scanning electron microscope. The milled powders were sintered by impulse plasma sintering. The structure of the sintered material was characterized by X-ray diffractometry and light microscopy. It was found that impulse plasma sintering of nanocrystalline powders obtained by ball milling of pure components enable to obtain a nanocrystalline austenitic stainless steel of very low porosity. © 2004 Advanced Study Center Co. Ltd.</p>