Comparison of Microstructure and Mechanical Properties of High Strength and Toughness Ship Plate Steel

Wang, Dong; Zhang, Peng; Peng, Xingdong; Liang, Yan; Li, Guanglong

doi:10.3390/ma14195886

Cited by 8 publications

(10 citation statements)

References 25 publications

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“…Figure 10 shows the OM images of the steel plate at the surface, 1 4 thickness and 1 2 thickness for RD-TD section. It can be seen from the images that the microstructure was mainly composed of polygonal ferrite (Pα), acicular ferrite (Aα) and granular bainite (GB) at the surface, in which there was Pα, a small amount of Aα and GB at 1 4 thickness and Pα and a small amount of pearlite (P) and GB at 1 2 thickness. The pearlite was formed due to the smaller deformation and slower cooling at the 1 2 thickness of the plate, which allowed sufficient time for the diffusion of alloy and carbon elements into the high-density region of dislocations in the deformation zone.…”

Section: Element Content Variation In Different Phasesmentioning

confidence: 99%

“…Figure 12c,f shows that there was only a small amount of GB at ½ thickness. 1 4 thickness and (c) 1 2 thickness.…”

Section: Element Content Variation In Different Phasesmentioning

confidence: 99%

“…Therefore, the requirements of the strength, toughness, fatigue property, weldability and corrosion resistance of structural materials for ship hulls are higher than those for general use. Therefore, a series of AH, EH, DH and FH high-strength or ultra-highstrength ship plate steel have been developed in order to meet the requirements mentioned above [1][2][3][4][5][6]. This kind of ship plate steel is usually made of low carbon steel containing Si and Mn, with added Mn, Cr, Ni, Nb, Ti and V and other microalloying elements, and the high strength and toughness of the steel can be obtained by the solid solution, fine grains or precipitation of carbide, such MC and M 7 C 3 (M was the microalloying elements mentioned above) strengthening [7].…”

Section: Introductionmentioning

confidence: 99%

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Studying on Alloying Elements, Phases, Microstructure and Texture in FH36 Ship Plate Steel

Wang

Li²,

Yin

et al. 2023

Materials

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This study used simulation software and experiments to analyze the microstructure and texture of FH36 ship plate steel at different thicknesses and temperatures. The austenite phase transformed into ferrite phase at 830 °C and MC and M7C3 phases precipitated at 1150 °C and 543 °C, respectively. At room temperature, the microstructure at the surface and 1/4 thickness consisted of polygonal ferrite, acicular ferrite and granular bainite, while the 1/2 thickness had less acicular ferrite and granular bainite. The texture components were mainly {111}<110> and {111}<112> at all thicknesses, but {001}<110> was stronger at 1/2 thickness. The grain size decreased gradually from 1/2 thickness to the surface, and the proportion of high-angle grain boundaries was significantly lower at the surface than at 1/4 and 1/2 thickness.

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Section: Element Content Variation In Different Phasesmentioning

confidence: 99%

“…Figure 12c,f shows that there was only a small amount of GB at ½ thickness. 1 4 thickness and (c) 1 2 thickness.…”

Section: Element Content Variation In Different Phasesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Studying on Alloying Elements, Phases, Microstructure and Texture in FH36 Ship Plate Steel

Wang

Li²,

Yin

et al. 2023

Materials

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“…Regarding research on different types of ship plate steel, differences in their performance have been observed. Taking EH36 and FH36 ship plate steel as examples, Wang et al [3] assessed the fatigue crack propagation rates of EH36, DH36, and FH36 ship plate steels at 2 of 23 room temperature, and found that EH36 steel had a higher fatigue crack propagation rate than the other steel types due to its higher carbon content and smaller grain size.…”

Section: Introductionmentioning

confidence: 99%

Study on the Tensile and Fatigue Properties of the FH36 Ship Steel Plates at Room and Low Temperatures

Wang,

Yan,

Yin

et al. 2023

Metals

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This study investigated the tensile properties and fatigue behavior of FH36 steel plates subjected to alternating rolling processes in different directions, as well as their performance at room temperature and −60 °C. The results revealed that by employing sequential rolling in both the rolling and transverse directions, the disparities in the mechanical properties between these two directions were eliminated, resulting in nearly identical tensile performances. The macroscopic features of the high-cycle and low-cycle fatigue fractures at both room temperature and at −60 °C were similar, with high-cycle fatigue fractures exhibiting oblique shear features and low-cycle fatigue fractures exhibiting cup-cone shapes. The crack initiation zones were consistently located on the surface of the specimens. As the maximum stress increased, the area of the high-cycle fatigue crack propagation zone decreased, while the area of the final fracture zone, the number of dimples, and the proportion of low-angle grain boundaries all increased. Under −60 °C conditions, the critical crack length for high-cycle fatigue, the maximum stress limit for the onset of high-cycle fatigue, and the fatigue limit were all higher than those at room temperature, indicating a superior low-temperature fatigue performance.

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“…), which is not the case for other methods [5][6][7][8][9]. This feature is due to a special mechanism for the formation of fine-grained steel microstructures during phase transformations under rapid cooling conditions in combination with the deformed structure of the initial phase [4,10]. It is extremely difficult to achieve such a microstructure using other technological solutions (for instance, by microalloying) without controlled cooling.…”

Section: Introductionmentioning

confidence: 99%

Validation of the Cooling Model for TMCP Processing of Steel Sheets with Oxide Scale Using Industrial Experiment Data

Beygelzimer¹,

Beygelzimer

2022

JMMP

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To verify the mathematical model of the water-jet cooling of steel plates developed by the authors, previously performed experimental studies of the temperature of the test plates in a roller-quenching machine (RQM) were used. The calculated temperature change in the metal as it moved in the RQM was compared with the readings of thermocouples installed at the center of the test plate and near its surface. The basis of the model is the dependence of the temperatures of the film, transition and nucleate boiling regimes on the thickness of the oxide scale layer on the cooled surface. It was found that the model correctly accounts for the oxide scale on the sheet surface, the flow rates and combinations of the RQM banks used, the water temperature, and other factors. For all tests, the calculated metal temperature corresponded well with the measured one. In the experiments with interrupted cooling, the calculated temperature plots repeated the characteristic changes in the experimental curves. The main uncertainty in the modeling of cooling over a wide temperature range can be attributed to the random nature of changes in the oxide scale thickness during water cooling. In this regard, the estimated thickness of the oxide scale layer should be considered the main parameter for adapting the sheet temperature-control process. The data obtained confirm the possibility of effective application of the model in the ACS of industrial TMCP (Thermo-Mechanical Controlled Process) systems.

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Comparison of Microstructure and Mechanical Properties of High Strength and Toughness Ship Plate Steel

Cited by 8 publications

References 25 publications

Studying on Alloying Elements, Phases, Microstructure and Texture in FH36 Ship Plate Steel

Studying on Alloying Elements, Phases, Microstructure and Texture in FH36 Ship Plate Steel

Study on the Tensile and Fatigue Properties of the FH36 Ship Steel Plates at Room and Low Temperatures

Validation of the Cooling Model for TMCP Processing of Steel Sheets with Oxide Scale Using Industrial Experiment Data

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