Effects of cooling rate, austenitizing temperature and austenite deformation on the transformation behavior of high-strength boron steel

Mun, Dong Jun; Shin, Eun Joo; Choi, Young Won; Lee, Jae Sang; Koo, Yang Mo

doi:10.1016/j.msea.2012.03.047

Cited by 69 publications

(24 citation statements)

References 21 publications

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“…Addition of small amounts of boron can increase the hardenability of low-carbon, low-alloy high-strength steels [1][2][3][4][5][6], and the hardenability of hardened and tempered steel can be enhanced by adding as little as 0.00 wt% boron [7]. Because such small quantities of boron can improve the hardenability of steel, boron addition is a desirable method for producing high strength steel products without the use of expensive materials.…”

Section: Introductionmentioning

confidence: 99%

Dry Sliding Wear Behavior of Boron-Doped AISI 1020 Steels

2017

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In the present study, the wear properties of AISI 1020 steels produced by a casting process with different boron contents were investigated, using a pin-on-disc tribometer under dry sliding conditions. The friction coefficients of undoped AISI 1020 steel, 0.002 and 0.01 wt% boron-doped samples were 0.33, 0.27, and 0.32, respectively. The addition of boron into AISI 1020 steel led to a decrease in the friction coefficient, due to the lubricating effect of boron; X-ray diffraction showed that both Fe2B and FeB phases are present in the boron-doped samples, both of which cause this lubrication. The wear test results also showed that the wear rate of the 0.002 wt% boron-doped AISI 1020 sample decreased compared to the undoped AISI steel, and then increased in the 0.01 wt% boron sample. Therefore, the wear resistance of AISI 1020 steel is increased with the addition of small amounts of boron. Scanning electron microscopy results indicated that the characteristic wear mechanism for the boron-doped sample surfaces was plastic deformation and mild abrasive wear; for undoped AISI 1020 steel, cracking and spalling were observed instead.

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Section: Introductionmentioning

confidence: 99%

Dry Sliding Wear Behavior of Boron-Doped AISI 1020 Steels

2017

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“…[19,24] Figure 11 illustrates the hardness distributions of the hot-formed ''hat-shaped'' piece based on the predictions obtained from FE-simulation coupled with QFA. The range of predicted hardness values was from 425 to 455 Hv throughout the formed ''hat-shaped'' piece.…”

Section: Resultsmentioning

confidence: 99%

Novel Method for Predicting Hardness Distribution of Hot-Stamped Part Using FE-Simulation Coupled with Quench Factor Analysis

Kim

2015

Metall Mater Trans B

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In the hot stamping of boron-alloyed steel, the mechanical properties of hot-stamped parts have been predicted by many empirical models based on Kirkaldy's equation. Although these models are skillfully developed, there is still a need to precisely and easily predict the mechanical properties in the hot stamping process. Therefore, this study aims to suggest a novel method for the accurate prediction of the hardness distribution of hot-stamped parts by the use of finite element (FE)-simulations coupled with quench factor analysis (QFA). First, dilatometry of boron steel was performed at various cooling rates from 0.5 to 70 K/s using a dilatometer with a forced-air cooling system. The dilatometry test provided hardness data according to the cooling rates, which were used to determine the material constants (K 1 to K 5 ) of the QFA and the timetemperature-property diagram of boron steel. Then, FE-simulation of hot stamping was conducted to obtain the cooling curves for blanks with thicknesses of 1.2 and 1.6 mm. The extracted results from the FE-simulation were used to predict the hardness distribution of the hotstamped parts using QFA. Finally, a hot stamping experiment was performed to verify the predicted results and to examine the effect of the blank thickness on the cooling rates of a hotstamped part. The predicted hardnesses for the parts were in good agreement with the measured values, within a maximum error of 4.96 pct.

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“…This is because the non-equilibrium segregation on grain boundaries, which works for preventing the formation and movement of grains, decreases with increasing grain size [14,25,31]. Thus, the 650 1C-treated steels, whose grains are larger than those of the 550 1C-treated steels (Table 2), do not clearly show the effect of B addition on grain refinement.…”

Section: Effect Of Boron Addition On Microstructural Modificationmentioning

confidence: 98%

“…B is known to improve the grain boundary cohesion, as it is segregated on grain boundaries [14,15,25,31,40]. The 2PB-5 steel has finer and more homogeneous microstructures than the 2P-5 steel ( Fig.…”

Section: Correlation Between Microstructure and Tensile And Charpy Immentioning

confidence: 99%

Effect of phosphorous and boron addition on microstructural evolution and Charpy impact properties of high-phosphorous-containing plain carbon steels

Hong

Shin

Lee

et al. 2013

Materials Science and Engineering: A

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Effects of cooling rate, austenitizing temperature and austenite deformation on the transformation behavior of high-strength boron steel

Cited by 69 publications

References 21 publications

Dry Sliding Wear Behavior of Boron-Doped AISI 1020 Steels

Dry Sliding Wear Behavior of Boron-Doped AISI 1020 Steels

Novel Method for Predicting Hardness Distribution of Hot-Stamped Part Using FE-Simulation Coupled with Quench Factor Analysis

Effect of phosphorous and boron addition on microstructural evolution and Charpy impact properties of high-phosphorous-containing plain carbon steels

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