Improving the Cold Resistance of 70–100-mm-Thick Heavy Plates FH40 for Marine Structures Built for Arctic Service

Goli-Oglu, E. A.

doi:10.1007/s11015-015-0131-4

Cited by 4 publications

(2 citation statements)

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“…for low strain A 2 expðβσÞ for high strain (5) where introducing the constant β and satisfies α = β/n 0 . Taking the logarithms on both sides of Equation ( 5) leads to the expression: The average values of n and β at different temperatures are 8.58 and 0.069, respectively.…”

Section: Constitutive Equation For Hot Deformationmentioning

confidence: 99%

“…[1,2] Extra-thick steel plates for marine engineering are widely used in the manufacture of large ships and the heavy marine engineering machinery. [3][4][5] Most traditional marine steel plates comprise Ni-Cr-Mo steel with a strength of 355-690 MPa or higher, and the thickness specifications are gradually increasing. [6][7][8] However, in the actual production of MES extra-thick plates, the distribution of residual stress and the microstructure along the thickness direction are uneven owing to the large difference in the distribution of the deformation, temperature field, and cooling rate.…”

Section: Introductionmentioning

confidence: 99%

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Hot Deformation Behavior of a Marine Engineering Steel for Novel 980 MPa Grade Extra‐Thick Plate

Wang,

Ren,

Liu

et al. 2024

steel research int.

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The hot deformation behavior of a marine engineering steel for a novel 980 MPa grade extra‐thick plate is investigated through hot compression tests at temperatures of 850–1200 °C and strain rates of 0.01–10 s−1. The flow stress curves are corrected to eliminate the effects of friction on the flow stress, and a modified constitutive model is established to accurately quantify the flow behaviors of the steel. Hot working maps of the steel are derived by using a dynamic materials model and the Prasad instability criterion. The effects of the deformation parameters on the dynamic recrystallization (DRX) nucleation mechanisms are evaluated using scanning electron microscopy and electron backscatter diffraction. The flow stress and peak strain increased with decreasing deformation temperature and increasing strain rate, respectively. The activation energy for hot deformation after friction correction is 380.49 kJ mol−1. The DRX mechanism involves the migration of subgrains. The deformation parameters are optimized by combining the degree of DRX and the size of recrystallized grain. The optimum hot working window is determined as 1100–1200 °C and 0.1–10 s−1.

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Section: Constitutive Equation For Hot Deformationmentioning

confidence: 99%