2011
DOI: 10.5574/ijose.2011.1.1.46
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A study on the simulation of water cooling process for the prediction of plate deformation due to line heating

Abstract: In a line heating process for hull forming, the phase of the steel transforms from austenite to martensite, bainite, ferrite, or pearlite depending on the actual speed of cooling following line heating. In order to simulate the water cooling process widely used in shipyards, a heat transfer analysis on the effects of impinging water jet, film boiling, and radiation was performed. From the above simulation it was possible to obtain the actual speed of cooling and volume percentage of each phase in the inherent … Show more

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Cited by 4 publications
(5 citation statements)
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“…How to balance the full search as well as the local search capability has been an important problem to be solved in the algorithm solution process, because the inertia weight is better for local refinement search when it is small and better for global search when it is large, 16 so to solve this problem, this paper proposes a new formula for the change of the inertia weight, which will change nonlinearly in time as the number of iterations t increases. Specifically, as shown in formula (8):…”
Section: Improvement Of Multi-objective Particle Swarm Algorithmmentioning
confidence: 99%
See 1 more Smart Citation
“…How to balance the full search as well as the local search capability has been an important problem to be solved in the algorithm solution process, because the inertia weight is better for local refinement search when it is small and better for global search when it is large, 16 so to solve this problem, this paper proposes a new formula for the change of the inertia weight, which will change nonlinearly in time as the number of iterations t increases. Specifically, as shown in formula (8):…”
Section: Improvement Of Multi-objective Particle Swarm Algorithmmentioning
confidence: 99%
“…by establishing a database mapping of the relationship between the geometric and forming parameters. Nomoto et al 8 proposed a simulation method of water cooling process to improve the predictability of plate deformation caused by line heating.…”
Section: Introductionmentioning
confidence: 99%
“…Inherent strain refers to strain that is not recovered even when structural restraints or loads are removed. The inherent strain ( * ) is obtained by subtracting the elastic strain ( e ) from the total strain total , as shown in Equation (1), and this strain is equal to the sum of the thermal strain th , plastic strain ( p ), and phase-transformation strain tr [4]. The inherent strain can be expressed as a virtual thermal expansion coefficient and temperature boundary conditions.…”
Section: Calculation Of Flatness and Tilt Angle Of The Flange By Weldingmentioning
confidence: 99%
“…They confirmed that the grains in the heat-affected zone (HAZ) were refined as ferrite and Materials 2022, 15, 7962 2 of 13 pearlite. Nomoto et al [4] analyzed the deformation caused by line heating by dividing the cooling region of the water-cooled process, considering the actual cooling rate and volume percentage of each phase in the inherent strain region after line heating. Hwang et al [5] analyzed the thermal deformation of a curved plate due to line heating using the shape of the HAZ derived from a flame-bending experiment.…”
Section: Introductionmentioning
confidence: 99%
“…They used a microscope and a tensile tester to confirm that the grains in the heat-affected zone (HAZ) were refined with ferrite and pearlite and that the yield and tensile strength were changed. Nomoto et al [ 3 ] analyzed the deformation caused by line heating by dividing the cooling region into the imaging jet region, pool boiling region, and laminar flow region, and they considered changes in physical properties because of phase transformation. Hwang et al [ 4 ] analyzed the generation of curved plates by line heating using the form of HAZ obtained experimentally, and they also considered changes in the physical properties caused by phase transformation.…”
Section: Introductionmentioning
confidence: 99%