Abstract
Microstructure evolution and austenite stability of a Fe-6.0Mn-0.2C-1.0Al-0.05Nb-0.20Mo alloy fabricated by a novel cyclic quenching treatment were investigated. According to the experimental results, the influences of cyclic quenching treatment on retained austenite could be described as follows: (1) turning austenite grain morphology from a mixture of lamellar and equiaxed grain to the lamellar grain with the increase in cyclic quenching passes, (2) increasing austenite stability for the grain refinement (up to 0.21μm) and higher C/Mn content in austenite. In addition, cyclic quenching treatment can increase the yield strength (YS), ultimate tensile strength (UTS) and total elongation (TE) of the experimental steel up to 172 MPa, 89 MPa and 8%, respectively. The average product of UTS and TE of the experimental steel after cyclic quenching treatment could reach up to 66.6 GPa·%. Moreover, the yield point elongation increased with the increase in cyclic quenching passes.
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