Microstructure and Properties of Mo Microalloyed Cold Rolled DP1000 Steels

Han, Qihang; Kang, Yonglin; Zhao, Xian-meng; Lü, Chao; Gao, Lu-feng

doi:10.1016/s1006-706x(11)60065-4

Cited by 14 publications

(5 citation statements)

References 12 publications

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“…Dual phase steels are considered as light steels with high strength [27], consisting of about 75-85% continuous ductile ferrite matrix phase with the remainder being mainly hardened martensite islands randomly distributed [28]. Moreover, they are known for being widely used in the automotive industry due to the need for improving fuel efficiency [29][30][31], with its subsequent energy saving and environmental protection [32].…”

Section: Introductionmentioning

confidence: 99%

Friction and wear behaviour of dual phase steels in discontinuous sliding contact conditions as a function of sliding speed and contact frequency

Ruiz-Andres¹,

Conde²,

Damborenea³

et al. 2015

Tribology International

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Friction and wear rate behaviour of dual phase steel discs (DP600) as a function of sliding speed (0.05-3.75 m/s), and contact frequency (0.6-16.5 Hz) have been studied under unidirectional ball-on-disc dry sliding conditions. The coefficient of friction (COF) and wear rate exhibit not only a highly dependence on the sliding speed, but also on the contact frequency which appears to be the key factor determining the wear behaviour of the DP600 even at constant sliding speed. The wear mechanism is mainly oxidative. The validity of Garcia-Ramil-Celis model is demonstrated for discontinuous sliding contacts at contact frequencies below 7 Hz. However, above 7 Hz, the disc behaves as if it were subjected to a continuous sliding contact.

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Section: Introductionmentioning

confidence: 99%

Friction and wear behaviour of dual phase steels in discontinuous sliding contact conditions as a function of sliding speed and contact frequency

Ruiz-Andres¹,

Conde²,

Damborenea³

et al. 2015

Tribology International

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“…Molybdenum: Mo increases the strength by increasing the hardenability of steel. The addition of Mo can inhibit the formation of eutectoid ferrite and pearlite during the hardening process [ 63 , 64 ], forming a small amount of overaged martensite islands and promoting the formation of hardened phases, such as bainite and martensite [ 64 , 65 ], to increase the steel yield strength. Mo is a strong carbide-forming element that is mainly present in solid solutions and carbides in alloy steel.…”

Section: Resultsmentioning

confidence: 99%

Modeling and Composition Design of Low-Alloy Steel’s Mechanical Properties Based on Neural Networks and Genetic Algorithms

2020

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Accurately improving the mechanical properties of low-alloy steel by changing the alloying elements and heat treatment processes is of interest. There is a mutual relationship between the mechanical properties and process components, and the mechanism for this relationship is complicated. The forward selection-deep neural network and genetic algorithm (FS-DNN&GA) composition design model constructed in this paper is a combination of a neural network and genetic algorithm, where the model trained by the neural network is transferred to the genetic algorithm. The FS-DNN&GA model is trained with the American Society of Metals (ASM) Alloy Center Database to design the composition and heat treatment process of alloy steel. First, with the forward selection (FS) method, influencing factors—C, Si, Mn, Cr, quenching temperature, and tempering temperature—are screened and recombined to be the input of different mechanical performance prediction models. Second, the forward selection-deep neural network (FS-DNN) mechanical prediction model is constructed to analyze the FS-DNN model through experimental data to best predict the mechanical performance. Finally, the FS-DNN trained model is brought into the genetic algorithm to construct the FS-DNN&GA model, and the FS-DNN&GA model outputs the corresponding chemical composition and process when the mechanical performance increases or decreases. The experimental results show that the FS-DNN model has high accuracy in predicting the mechanical properties of 50 furnaces of low-alloy steel. The tensile strength mean absolute error (MAE) is 11.7 MPa, and the yield strength MAE is 13.46 MPa. According to the chemical composition and heat treatment process designed by the FS-DNN&GA model, five furnaces of Alloy1–Alloy5 low-alloy steel were smelted, and tensile tests were performed on these five low-alloy steels. The results show that the mechanical properties of the designed alloy steel are completely within the design range, providing useful guidance for the future development of new alloy steel.

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“…However, it is not sufficient to suppress bainitic transformation during the hot-dip galvanization process and is harmful to galvanization quality [14]. Even though it has been proven in several studies that this situation can be improved by adding the alloy Mo, the high cost is an unavoidable disadvantage [15][16][17]. According to previous studies, Cr has a similar effect to Mo, but the cost is significantly lower than Mo [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Chromium on Microstructure and Mechanical Properties of Hot-Dip Galvanized Dual-Phase (DP980) Steel

Chen,

Liang,

Yang

et al. 2023

Crystals

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Generally, the addition of Chromium (Cr) into the dual-phase (DP) steels can suppress bainitic transformation. In this work, the continuous hot-dip galvanization of DP980 steel is thermally simulated with various Cr contents of 0/0.3/0.6 wt.%, and the effect of Cr on bainitic transformation and properties of steels is studied. The results indicate that the bainitic transformation is obviously inhibited. The fraction of bainite decreases with the increasing Cr content. The incubation time is prolonged in the 0.6Cr steel with a slower bainitic transformation rate. Compared to that of 0 and 0.3Cr steels, the 0.6Cr steel exhibits a high tensile strength of 1033 MPa and uniform elongation of 9.1% due to the rapid strain-hardening rate. As a result, the mechanical properties of 0.6Cr steel satisfy the requirements of hot-dip galvanized DP980 steel.

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Microstructure and Properties of Mo Microalloyed Cold Rolled DP1000 Steels

Cited by 14 publications

References 12 publications

Friction and wear behaviour of dual phase steels in discontinuous sliding contact conditions as a function of sliding speed and contact frequency

Friction and wear behaviour of dual phase steels in discontinuous sliding contact conditions as a function of sliding speed and contact frequency

Modeling and Composition Design of Low-Alloy Steel’s Mechanical Properties Based on Neural Networks and Genetic Algorithms

Effect of Chromium on Microstructure and Mechanical Properties of Hot-Dip Galvanized Dual-Phase (DP980) Steel

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