A Study of the Optimum Quenching Temperature of Steels with Various Hot Rolling Microstructures after Cold Rolling, Quenching and Partitioning Treatment

Bin Chen; Juhua Liang; Tao Kang; Ronghua Cao; Cheng Li; Jiangtao Liang; Feng Li; Zhengzhi Zhao; Di Tang

doi:10.3390/met8080579

Metals (Jul 2018)

A Study of the Optimum Quenching Temperature of Steels with Various Hot Rolling Microstructures after Cold Rolling, Quenching and Partitioning Treatment

Bin Chen,
Juhua Liang,
Tao Kang,
Ronghua Cao,
Cheng Li,
Jiangtao Liang,
Feng Li,
Zhengzhi Zhao,
Di Tang

Affiliations

Bin Chen: Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China
Juhua Liang: Collaborative Innovation Center of steel Technology, University of Science and Technology Beijing, Beijing 100083, China
Tao Kang: Collaborative Innovation Center of steel Technology, University of Science and Technology Beijing, Beijing 100083, China
Ronghua Cao: Collaborative Innovation Center of steel Technology, University of Science and Technology Beijing, Beijing 100083, China
Cheng Li: Collaborative Innovation Center of steel Technology, University of Science and Technology Beijing, Beijing 100083, China
Jiangtao Liang: Collaborative Innovation Center of steel Technology, University of Science and Technology Beijing, Beijing 100083, China
Feng Li: Collaborative Innovation Center of steel Technology, University of Science and Technology Beijing, Beijing 100083, China
Zhengzhi Zhao: Collaborative Innovation Center of steel Technology, University of Science and Technology Beijing, Beijing 100083, China
Di Tang: Collaborative Innovation Center of steel Technology, University of Science and Technology Beijing, Beijing 100083, China

DOI: https://doi.org/10.3390/met8080579
Journal volume & issue: Vol. 8, no. 8
p. 579

Abstract

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Quenching and partitioning (Q&P) processes were applied to a cold-rolled high strength steel (0.19C-1.26Si-2.82Mn-0.92Ni, wt %). The effects of the prior hot-rolled microstructure on the optimum quenching temperature of the studied steels were systematically investigated. The microstructure was analyzed by means of transmission electron microscope (TEM), electron backscatter diffraction (EBSD) and X-ray diffraction (XRD). Compared with the ferrite pearlite mixture matrix, the lower martensite start (Ms) temperature and smaller prior austenite grain size in the cold-rolled martensite matrix are the main reasons for the optimum quenching temperature shifting to a lower temperature in the Q&P steels. We found that an empirical formula that only considers the influence of the alloy composition in the calculation of the Ms temperature will cause a certain interference to the pre-determined optimum quenching temperature of the Q&P steel.

Published in Metals

ISSN: 2075-4701 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.mdpi.com/journal/metals

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