Carbon partitioning and microstructure evolution during tempering of an Fe-Ni-C steel. (November 2019)

• Record Type: Journal Article
• Authors: Harding, I.; Mouton, I.; Gault, B.; Raabe, D.; Kumar, K.S.
• Is Part Of: Scripta materialia. Number 172(2019)
• Page Start: 38
• Page End: 42
• Publication Date: 2019-11
• Subjects: Atom probe tomography -- Quench and partition steel -- Tempering -- Carbides -- Phase transformations; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.06.036
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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. Graphical abstract: Unlabelled Image