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Open AccessArticle

Study of Nanometer-Sized Precipitation and Properties of Fire Resistant Hot-Rolled Steel

1
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2
Technical Center of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(11), 1230; https://doi.org/10.3390/met9111230
Received: 27 October 2019 / Revised: 13 November 2019 / Accepted: 13 November 2019 / Published: 18 November 2019
(This article belongs to the Special Issue High-Strength Low-Alloy Steels)
Nanometer-sized precipitated carbides in a low carbon Ti-V-Mo bearing steel were obtained through hot rolling and air cooling and were investigated by transmission electron microscopy (TEM). The nanometer-sized interphase-precipitated carbides have been found to exhibit an average diameter of ~6.1 ± 2.7 nm, with an average spacing of ~24–34 nm. Yield strength of 578 ± 20 MPa and tensile strength of 813 ± 25 MPa were achieved with high elongation of 25.0 ± 0.5% at room temperature. The nanometer-sized precipitation exhibited high stability after annealing at high temperatures of 600 °C and 650 °C for 3 h. Average diameters of carbides were statistically measured to be ~6.9 ± 2.3 nm and 8.4 ± 2.6 nm after tempering at high temperatures of 600 °C and 650 °C, respectively. The micro-hardness was ~263–268 HV0.1 after high temperature tempering, which was similar to the hot-rolled sample (273 HV0.1), and yield strength of 325 ± 13 MPa and 278 ± 4 MPa was achieved at elevated temperatures of 600 °C and 650 °C, respectively. The significant decrease of yield strength at 650 °C was attributed to the large decrease in shear modulus. View Full-Text
Keywords: interphase precipitation; high temperature strength; stability; low carbon; low alloy steel interphase precipitation; high temperature strength; stability; low carbon; low alloy steel
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MDPI and ACS Style

Xie, Z.; Song, Z.; Chen, K.; Jiang, M.; Tao, Y.; Wang, X.; Shang, C. Study of Nanometer-Sized Precipitation and Properties of Fire Resistant Hot-Rolled Steel. Metals 2019, 9, 1230.

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