Effect of Mo Addition on Strength of Fire-Resistant Steel at Elevated Temperature

Wan, Rongchun; Sun, Feng; Zhang, Lanting; Shan, Aidang

doi:10.1007/s11665-014-1051-3

Cited by 20 publications

(10 citation statements)

References 6 publications

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“…In high strength low alloyed steels Mo is well known to provide phase balance strengthening, via facilitating the bainite transformation [1][2][3][4][5], and solid solution strengthening [6][7][8][9]. It can decrease the rate of dynamic recrystallization of austenite [10][11][12], which may lead to grain refinement.…”

Section: Introductionmentioning

confidence: 99%

Comparative Effect of Mo and Cr on Microstructure and Mechanical Properties in NbV-Microalloyed Bainitic Steels

Kostryzhev

Singh

Chen

et al. 2018

Metals

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Steel product markets require the rolled stock with further increasing mechanical properties and simultaneously decreasing price. The steel cost can be reduced via decreasing the microalloying elements contents, although this decrease may undermine the mechanical properties. Multi-element microalloying with minor additions is the route to optimise steel composition and keep the properties high. However, this requires deep understanding of mutual effects of elements on each other's performance with respect to the development of microstructure and mechanical properties. This knowledge is insufficient at the moment. In the present work we investigate the microstructure and mechanical properties of bainitic steels microalloyed with Cr, Mo, Nb and V. Comparison of 0.2 wt. % Mo and Cr additions has shown a more pronounced effect of Mo on precipitation than on phase balance. Superior strength of the MoNbV-steel originated from the strong solid solution strengthening effect. Superior ductility of the CrNbV-steel corresponded to the more pronounced precipitation in this steel. Nature of these mechanisms is discussed.

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Section: Introductionmentioning

confidence: 99%

Comparative Effect of Mo and Cr on Microstructure and Mechanical Properties in NbV-Microalloyed Bainitic Steels

Kostryzhev

Singh

Chen

et al. 2018

Metals

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“…Generally, fire‐resistant steels are required to meet the standard which stipulates that the yield strength at 600 °C after holding at 600 °C for 3 h has to be greater than two‐thirds the yield strength at room temperature. [ 1–4 ] The higher strength at elevated temperatures can be obtained through solid‐solution strengthening and precipitation strengthening. [ 5 ] Elements, Mo, Ti, V, Nb, etc., are added to ensure desired strength at elevated temperatures via precipitation strengthening.…”

Section: Introductionmentioning

confidence: 99%

“…[ 5 ] Elements, Mo, Ti, V, Nb, etc., are added to ensure desired strength at elevated temperatures via precipitation strengthening. [ 1–3 ] Studies have shown that the addition of Mo not only improves precipitation strengthening and solid‐solution strengthening of steel at elevated temperatures but also promotes bainitic transformation [ 1,2 ] and hinders the dislocation movement. [ 6 ] When the volume fraction of bainite exceeds ≈15%, the fire resistance is significantly improved.…”

Section: Introductionmentioning

confidence: 99%

“…[ 6 ] When the volume fraction of bainite exceeds ≈15%, the fire resistance is significantly improved. [ 2 ] It has also been shown that the fire resistance of bainite with high boundary density is relatively more superior than ferrite with low boundary density. [ 7,8 ] However, the reasons for superior fire resistance of bainite/martensite have not been further studied in detail to the best of our understanding.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Microstructures on the Mechanical Behavior of Fire‐Resistant Dual‐Phase Steels at Elevated Temperature

Cong

Zhao

et al. 2021

steel research int.

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Herein, the start laminar cooling temperature to obtain different volume fractions of ferrite and bainite/martensite is optimized. Lower start laminar cooling temperature yields a higher volume fraction of ferrite and also decreases the transformation temperature of bainite/martensite. The yield strength of the experimental dual‐phase steel at 600 °C increases from ≈484.8 to ≈526.2 MPa by decreasing the start laminar cooling temperature from 650 to 600 °C. To understand the effect of microstructure, the dislocation density, volume fraction of precipitates, and Young's modulus at elevated temperature are statistically analyzed. A machine learning method, known as gradient boosting decision tree, is used to classify the grain boundaries. The statistical results suggest that the steel subject to lower start laminar cooling temperature shows higher Young's modulus and larger volume fraction of precipitates at elevated temperature. Furthermore, at elevated temperature, the boundary is stable and the proportion of Σ3 boundary is greater, when lower start laminar cooling temperature is adopted. Theoretical calculations results suggest that the lower transformation temperature of bainite/martensite improves the fire resistance of dual‐phase steels.

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“…Studies [4,5] suggested that Mo addition was an effective approach for achieving high strength at high temperature for low alloy steels. It was suggested that there was a strength increment of 13.7 MPa per 0.1% Mo addition at 600 • C when the total Mo content was lower than 0.5% by solid-solution strengthening and bainite strengthening [6][7][8]. However, as an expensive alloying element, high-addition of Mo will greatly increase the cost.…”

Section: Introductionmentioning

confidence: 99%

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

Xie

Song

Chen

et al. 2019

Metals

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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.

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Effect of Mo Addition on Strength of Fire-Resistant Steel at Elevated Temperature

Cited by 20 publications

References 6 publications

Comparative Effect of Mo and Cr on Microstructure and Mechanical Properties in NbV-Microalloyed Bainitic Steels

Comparative Effect of Mo and Cr on Microstructure and Mechanical Properties in NbV-Microalloyed Bainitic Steels

Effect of Microstructures on the Mechanical Behavior of Fire‐Resistant Dual‐Phase Steels at Elevated Temperature

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

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