Carbon partitioning and microstructure evolution during tempering of an Fe-Ni-C steel

Harding, I. and Mouton, I. and Gault, B. and Raabe, D. and Kumar, K.S.

Volume: 172 Pages: 38-42
DOI: 10.1016/j.scriptamat.2019.06.036
Published: 2019

Partitioning of C during tempering of quenched Fe-9.6Ni-0.5C-0.6Mn-0.6Mo-0.7Cr-0.1V (at.%) steel is determined by atom probe tomography and the resulting microstructure is described. The precipitated austenite size, together with its C and Ni content control its thermal stability and these can vary differently with tempering time and temperature. Thus, both austenite and strong carbide formers compete for the available C early in the process. Due to widely different transport kinetics, C likely plays a dominant role early but is either fully consumed or its role diminishes by dilution, and Ni partitioning eventually takes over as the austenite stability-controlling species. © 2019 Elsevier Ltd

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