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Article

Modeling of Precipitation Hardening during Coiling of Nb–Mo Steels

1
Centre for Metallurgical Process Engineering, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada
2
Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
3
Technical Research Center, Hyundai-Steel Company, Dangjin 167-32, Korea
4
Niobium Tech Asia, Singapore 068898, Singapore
5
NiobelCon bvba, 2970 Schilde, Belgium
*
Author to whom correspondence should be addressed.
Metals 2018, 8(10), 758; https://doi.org/10.3390/met8100758
Received: 21 August 2018 / Revised: 19 September 2018 / Accepted: 21 September 2018 / Published: 25 September 2018
(This article belongs to the Special Issue Advances in Microalloyed Steels)
Nb–Mo low-alloyed steels are promising advanced high strength steels (AHSS) because of the highly dislocated bainitic ferrite microstructure conferring an excellent combination of strength and toughness. In this study, the potential of precipitation strengthening during coiling for hot-strip Nb–Mo-bearing low-carbon steels has been investigated using hot-torsion and aging tests to simulate the hot-rolling process including coiling. The obtained microstructures were characterized using electron backscatter diffraction (EBSD), highlighting the effects of Nb and Mo additions on formation and tempering of the bainitic ferrite microstructures. Further, the evolution of nanometer-sized precipitates was quantified with high-resolution transmission electron microscopy (HR-TEM). The resulting age hardening kinetics have been modelled by combining a phenomenological precipitation strengthening model with a tempering model. Analysis of the model suggests a narrower coiling temperature window to maximize the precipitation strengthening potential in bainite/ferrite high strength low-alloyed (HSLA) steels than that for conventional HSLA steels with polygonal ferrite/pearlite microstructures. View Full-Text
Keywords: advanced high strength steels; HSLA steels; precipitation strengthening; tempering; bainitic ferrite; EBSD; austenite-to-ferrite transformation; hot-torsion test; coiling simulation advanced high strength steels; HSLA steels; precipitation strengthening; tempering; bainitic ferrite; EBSD; austenite-to-ferrite transformation; hot-torsion test; coiling simulation
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MDPI and ACS Style

Maetz, J.-Y.; Militzer, M.; Chen, Y.W.; Yang, J.-R.; Goo, N.H.; Kim, S.J.; Jian, B.; Mohrbacher, H. Modeling of Precipitation Hardening during Coiling of Nb–Mo Steels. Metals 2018, 8, 758. https://doi.org/10.3390/met8100758

AMA Style

Maetz J-Y, Militzer M, Chen YW, Yang J-R, Goo NH, Kim SJ, Jian B, Mohrbacher H. Modeling of Precipitation Hardening during Coiling of Nb–Mo Steels. Metals. 2018; 8(10):758. https://doi.org/10.3390/met8100758

Chicago/Turabian Style

Maetz, Jean-Yves, Matthias Militzer, Yu W. Chen, Jer-Ren Yang, Nam H. Goo, Soo J. Kim, Bian Jian, and Hardy Mohrbacher. 2018. "Modeling of Precipitation Hardening during Coiling of Nb–Mo Steels" Metals 8, no. 10: 758. https://doi.org/10.3390/met8100758

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