Prediction of the deflection and residual stress in controlled cooling of hot-rolled steel beams including load and arbitrary support

Boyadjiev, I I; Thomson, Peter Frederic; Lam, Yee Cheong

doi:10.1016/j.jmatprotec.2004.01.008

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…Therefore, residual stresses might have formed during the air-cool quench that followed the last heat treatment performed on the AR material. However, previous work has shown that air-cooling from ~1000°C produces negligible residual stresses in 20 mm diameter round rods of both 1010 carbon steel 96 and IN718 26 which suggests a different source for the RS in the current 15.9 mm diameter 17-4PH. This contradiction is clarified by comparing the AR and SA processing steps and RS profiles in Fig.…”

Section: Residual Stress In the 17-4ph Rodmentioning

confidence: 84%

3D fatigue crack path deflection and residual stresses in 17-4PH stainless steel rod

Shoemaker

Harris

Smudde

et al. 2023

International Journal of Fatigue

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Section: Residual Stress In the 17-4ph Rodmentioning

confidence: 84%

3D fatigue crack path deflection and residual stresses in 17-4PH stainless steel rod

Shoemaker

Harris

Smudde

et al. 2023

International Journal of Fatigue

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“…In addition, the film heat transfer coefficient was calculated for ideal conditions and modified throughout the process to achieve the real cooling rate. Boyadjiev et al [20] used a plane-strain FE analysis for the computational prediction of deflection and residual stress in the cooling of hot-rolled beams. The analysis was based on the generalized plane-strain model of Abouaf et al [14] .…”

Section: Related Research Workmentioning

confidence: 99%

Analysis of rail cooling strategies through numerical simulation with instant calculation of thermal expansion coefficient

et al. 2010

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This article describes a new methodology to simulate the cooling process for an asymmetrical Ri60 grooved rail, designed for city tramways, in a more realistic manner than that conducted previously by other authors for long steel sections. The approach considers the phase transformation of the steel and the forced convection cooling. The process is modelled as an uncoupled thermo-mechanical problem. First, the rail's temperature history is obtained from a computer fluid dynamic model and subsequently introduced in the finite element model, in order to model the stresses and displacements. This second stage involves the calculation of the thermal expansion coefficient, for each element and at each iteration. The calculation is made according to the continuous cooling transformation diagram. These results lead to the extremely reliable determination of residual stresses as proved by the comparison with experimental data obtained in the industrial plant. The methodology allows for an accurate study of two types of cooling strategies for the Ri60 and the selection of the more suitable one. KeywordsResidual stresses; Section manufacturing; Thermal expansion coefficient. Análisis de estrategias de enfriamiento de raíles mediante simulación numérica con cálculo instantáneo del coeficiente de expansión térmica ResumenEn este artículo se describe una nueva metodología para simular el proceso de enfriamiento de un rail asimétrico Ri60, diseñado para tranvías, de una forma mucho más realista que lo realizado hasta ahora para perfiles largos de acero. La propuesta considera los efectos de la transformación de fases del acero y el enfriamiento por convección forzada. El proceso es simulado como un proceso termo-mecánico desacoplado. Primero, las curvas de enfriamiento del rail son obtenidas a partir de un modelo basado en dinámica de fluidos computacional y posteriormente introducidas en el modelo de elementos finitos para calcular las tensiones y desplazamientos. En esta segunda fase se calcula, para cada elemento finito y en cada iteración, el coeficiente de dilatación térmica lineal según el diagrama de curvas de enfriamiento continuo. Estos resultados permiten determinar las tensiones residuales al final del proceso con muy buena fidelidad respecto a los datos experimentales obtenidos en la planta industrial. La metodología permite estudiar con precisión dos tipos de estrategias de enfriamiento del Ri60 y seleccionar la más conveniente. Palabras claveTensiones residuales; Fabricación de perfiles; Coeficiente de dilatación térmica lineal.

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“…The evolution of the heat transfer coefficient was calculated for ideal conditions of natural convection and afterwards included in the model. Boyadjiev et al 17,18 used a plane strain FE analysis (FEA) for the computational prediction of bending and residual stress in the cooling of hot rolled beams. The analysis was based on the generalised plane strain model by Abouaf et al 14 They also included the contact with the supporting table and the effect of the weight of the beam.…”

Section: Introductionmentioning

confidence: 99%

“…The evolution of the heat transfer coefficient was calculated for ideal conditions of natural convection and afterwards included in the model. Boyadjiev et al 17,18. used a plane strain FE analysis (FEA) for the computational prediction of bending and residual stress in the cooling of hot rolled beams.…”

Section: Introductionmentioning

confidence: 99%

Realistic modelling and optimisation of steel section cooling process

Pernía

Martínez-de-Pisón

Ordieres

et al. 2011

Ironmaking & Steelmaking

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The cooling process in the manufacture of long steel products generates residual stresses and bending in the section. This initial state, arising from the cooling bed, influences the final residual stresses and bending at the end of the subsequent processes. Owing to the importance of the cooling process, this paper presents realistic modelling and optimisation using computational fluid dynamics (CFD) and finite element analysis. Computational fluid dynamics rendered it possible to accurately overcome two main problems common to previous cooling models: the realistic modelling of the heat transfer coefficient (especially important when modelling outdoor cooling beds because of the implications of forced convection) and the precise view factor modelling of the different section surfaces (useful when modelling a complex section). After decoupled CFD thermo-analysis, the temperature record of each node in the section was loaded into the finite element stress displacement model. The relevant influence of steel phase transformation was considered applying a combined methodology, involving an ABAQUS user subroutine. Accordingly, accurate residual stresses and bending were obtained. After establishing the models, several strategies were analysed for reducing the residual stresses during the cooling process. Results were successfully validated with experimental data from structural section producers. List of symbolsA areas, m 2 F view factor h heat transfer coefficient, W m 22 uC 21 q convective heat flux, W m 22 L segment length N number of divisions of the segments NT11 temperature, uC S stress, Pa S33 longitudinal stress, Pa t f beam flange thickness, mm t w beam web thickness, mm T temperature, uC T f transformation end temperature, uC T s transformation start temperature, uC X volume fraction of intended phase at T temperature, % X 0 volume fraction of intended phase at transformation termination, % a th coefficient of thermal expansion, uC 21

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Prediction of the deflection and residual stress in controlled cooling of hot-rolled steel beams including load and arbitrary support

Cited by 9 publications

References 9 publications

3D fatigue crack path deflection and residual stresses in 17-4PH stainless steel rod

3D fatigue crack path deflection and residual stresses in 17-4PH stainless steel rod

Analysis of rail cooling strategies through numerical simulation with instant calculation of thermal expansion coefficient

Realistic modelling and optimisation of steel section cooling process

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