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Sci Rep. 2019 Nov 19;9(1):17023. doi: 10.1038/s41598-019-53303-1.

Strain-rate sensitive ductility in a low-alloy carbon steel after quenching and partitioning treatment.

Author information

1
Institute of Materials Science and Engineering, Chemnitz University of Technology, Erfenschlager Str. 73, 09125, Chemnitz, Germany. philipp.frint@mb.tu-chemnitz.de.
2
Institute of Materials Science and Engineering, Chemnitz University of Technology, Erfenschlager Str. 73, 09125, Chemnitz, Germany.
3
Physical Metallurgy (PhM), TU Darmstadt, Alarich-Weiss-Str. 2, 64287, Darmstadt, Germany.

Abstract

We investigate an extraordinarily high ductility in a low alloy carbon steel at an elevated temperature after a quenching and partitioning (Q&P) treatment. The conventional (quenched and tempered) reference material does not show similar behavior. Interestingly, the Q&P treated material's ductility is considerably reduced at increasing strain rates while strength remains almost constant. These results indicate the presence of a diffusion-controlled deformation mechanism at elevated temperatures. Our research shows that interlath retained austenite is more stable during deformation at higher temperatures, resulting in a delayed transformation to martensite and therefore to a more pronounced contribution to plastic deformation at (and in the vicinity of) the many interfaces inherently present in this multi-phase steel.

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