期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 31, 期 2, 页码 199-204出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2014.07.010
关键词
Bainite; Quenching and partitioning; Tempering; Microstructure evolution; Mechanical properties
资金
- National Natural Science Foundation of China [51301012]
We obtained a good combination of strength and ductility in a 0.4C-2.0Mn-1.7Si-0.4Cr (wt%) steel, namely, similar to 1.7 GPa of ultimate tensile strength and similar to 26% of elongation, by conducting a Q-P-T (quenching-partitioning-tempering) process incorporating the formation of carbide-free bainite. The tempering behavior of this steel was discussed by using experimental finding (scanning electron microscopy, X-ray diffraction (XRD), transmission electron microscopy and dilatometer) and CCE (constrained carbon equilibrium) modeling. The XRD results combined with CCE calculation prove that carbon partitioning from martensite to austenite occurs during tempering. Consequently, the thermodynamic stability of retained austenite is enhanced. This idea can be utilized to design novel Q-P-T processes in future.
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