%0 journal article
%@ 0261-3069
%A Vieweg, A., Povoden-Karadeniz, E., Ressel, G., Prevedel, P., Wojcik, T., Mendez-Martin, F., Stark, A., Keckes, J., Kozeschnik, E.

%D 2017
%J Materials and Design

%P 214-222 
%R doi:10.1016/j.matdes.2017.09.065
%T Phase evolution and carbon redistribution during continuous tempering of martensite studied with high resolution techniques
%U https://doi.org/10.1016/j.matdes.2017.09.065
 
%X Using high resolution techniques, such as, 3D atom probe tomography, transmission electron microscopy and synchrotron radiation, the continuous tempering process of a 50CrMo4 steel is analyzed. Differences of continuous heating compared to isothermal holding at certain tempering temperatures are discussed. Focus is laid on in-depth characterization of phase development and carbon redistribution effects, such as, segregation and clustering. The results of this work suggest that segregation is the dominant effect at low temperatures (< 150 °C), while cluster formation within these segregated areas is prominent at intermediate temperatures (150–250 °C). Epsilon carbide is formed during continuous heating with off-stoichiometric chemical composition (270–350 °C). It transforms finally into cementite (T > 350 °C).