Paper Title:

Atomic Scale Investigation of Solutes and Precipitates in High Strength Steels

Periodical Materials Science Forum (Volume 762)
Main Theme Physical and Numerical Simulation of Materials Processing VII
Edited by L. Pentti Karjalainen, David A. Porter and Seppo A. Järvenpää
Pages 14-21
DOI 10.4028/www.scientific.net/MSF.762.14
Citation Peter Hodgson et al., 2013, Materials Science Forum, 762, 14
Online since July, 2013
Authors Peter Hodgson, Subrata Mukherjee, Hossein Beladi, Xiang Yuan Xiong, Ilana B. Timokhina
Keywords Atom Probe Tomography, Clusters, Interphase Precipitation, Nanoprecipitates, Nanoscale Bainite, Thermomechanical Processing
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Two steels, ferritic, high strength with interphase precipitation and nanobainitic, were used to show the advances in and application of atom probe. The coexistence of the nanoscale, interphase Nb-Mo-C clusters and stoichiometric MC nanoparticles was found in the high strength steel after thermomechanical processing. Moreover, the segregation of carbon at different heterogeneous sites such as grain boundary that reduces the solute element available for fine precipitation was observed. The APT study of the solutes redistribution between the retained austenite and bainitic ferrite in the nanobainitic steel revealed: (i) the presence of two types of the retained austenite with higher and lower carbon content and (ii) segregation of carbon at the local defects such as dislocations in the bainitic ferrite during the isothermal hold.

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