Journal
MATERIALS & DESIGN
Volume 59, Issue -, Pages 193-198Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2014.02.035
Keywords
Retained austenite; Low temperature toughness; Intercritical partition; Austenite reverted transformation
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Funding
- National Basic Research Program of China (973 Program) [2010CB630801]
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Fine film-like stable retained austenite was obtained in a Fe-0.08C-0.5Si-2.4Mn-0.5Ni in weight percent (wt.%) steel by the two-step intercritical heat treatment. The first step of intercritical annealing creates a mixed microstructure of preliminary alloy-enriched martensite and lean alloyed intercritical ferrite, which is called as reverted structure and un-reverted structure, respectively. The second step of intercritical tempering is beneficial for producing film-like stable reverted austenite along the reverted structure. The stabilization of retained austenite was studied by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), dilatometry and X-ray diffraction (XRD) analysis. The two-step austenite reverted transformation associated with intercritical partition of C, Mn and Ni is believed to be the underlying basis for stabilization of retained austenite during the two-step intercritical heat treatment. Stable retained austenite is not only beneficial for high ductility, but also for low temperature toughness by restricting brittle fracture. With 10% (volume fraction) of retained austenite in the steel, high low temperature toughness with average Charpy impact energy of 651 at -80 degrees C was obtained. (C) 2014 Elsevier Ltd. All rights reserved.
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