Abstract
The split quenching and partitioning (S-QP) process allows researchers to investigate microstructure and properties separately, i.e., before and after partitioning. After the partitioning process, the yield strength increases by approximately 300 MPa in the ferrite-bearing δ-quenching and partitioning (δ-QP) steel. We propose that carbon trapping in dislocations at the ferrite grain boundaries during partitioning process is responsible for the yield strength enhancement of ferrite. Combined transmission electron microscopy and 3D atom probe tomography observations demonstrate carbon atoms segregating in dislocations. The mechanisms for the high yield strength of ferrite presented QP steels are clarified for the first time in this research.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China [Grant Nos. U1560204 and 51722402] and Liaoning Province High-tech R&D Program [Grant Number 2015105004]. The authors acknowledge the facilities, and the scientific and technical assistance of the Australian Microscopy & Microanalysis Research Facility at the Australian Centre for Microscopy & Microanalysis, the University of Sydney.
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Manuscript submitted June 7, 2017.
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Chen, P., Wang, G.D., Ceguerra, A.V. et al. Yield Strength Enhancement by Carbon Trapping in Ferrite of the Quenching and Partitioning Steel. Metall Mater Trans A 49, 235–240 (2018). https://doi.org/10.1007/s11661-017-4364-7
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DOI: https://doi.org/10.1007/s11661-017-4364-7