HRTEM and EFTEM Investigation of the Eutectoid Steel After Severe Plastic Deformation

Ivanisenko, Y., MacLaren, I. , Rosner, H. and Fecht, H.J. (2010) HRTEM and EFTEM Investigation of the Eutectoid Steel After Severe Plastic Deformation. In: 3rd International Symposium on Ultrafine Grained Materials, Charlotte, NC, USA, 15-17 Mar 2004, pp. 387-392. ISBN 9780873395717

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The nanocrystalline structure of an eutectoid steel after severe plastic deformation by High Pressure Torsion (HPT) was studied by means of High Resolution TEM (HRTEM) and Energy Filtered TEM (EFTEM). In an as-processed specimen nano-sized areas of modulated fringe contrast were revealed. It was shown, that in most cases the observed fringes can be explained as Moire patterns resulting from the overlapping of two lattices: normal iron and a highly distorted lattice with a structure similar to BCC iron. It seemed most likely that these distorted regions were transitional carbon-containing phases. Distortions due to dislocation networks were shown to be unlikely in this case. EFTEM investigation revealed a fairly uniform distribution of carbon in the HPT steel that corresponds well with our previous results about total cementite dissolution as a result of HPT, although some small carbon enrichments were seen, which may correspond to the distorted phases observed by HRTEM.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:MacLaren, Dr Ian
Authors: Ivanisenko, Y., MacLaren, I., Rosner, H., and Fecht, H.J.

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