Numerical calculations of residual–stress relaxation in quenched plates

Boyer, Jean‐Claude; Boivin, M.

doi:10.1179/mst.1985.1.10.786

Cited by 25 publications

(14 citation statements)

References 2 publications

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“…This model predicted compressive surface residual stress magnitudes greater than 200MPa. This quench-induced stress prediction has been experimentally determined to be accurate [12] and is similar to values published in literature [6,8,13,14]. The original model assumed isotropic material behaviour that was temperature and strain rate dependent and followed a perfectly plastic stress-strain curve at all temperatures observed during quenching.…”

Section: Description Of Model -Materials and Elementssupporting

confidence: 64%

“…The presence of tensile stresses in the core after stretching is similar to previous work carried out on stress relief of aluminium alloys. This work indicates that if tensile stresses exist before stretching then tensile stresses of smaller magnitudes will remain [8,20], while if compressive stresses exist in the core of the sample (in this case rolled sheet) before stretching then compressive stresses of smaller magnitudes will remain [21]. However, Alcoa [22] found that stress relief by stretching resulted in tensile surface stresses (2.5ksi or 17MPa) while the computer model showed that these stresses remained compressive.…”

Section: As Quenched Stress Relief By Stretchingmentioning

confidence: 99%

“…It has been found that application of approximately 2% stretch results in almost complete relief of quench-induced stresses while after even higher levels of cold compression (4-6%) significant stress magnitudes remain [7,8]. It was therefore decided to model the application of a 2% stretch in the L direction to observe the effect on the quench-induced stress magnitude.…”

Section: As Quenched Stress Relief By Stretchingmentioning

confidence: 99%

“…Mechanical deformation, on the other hand, can take place at room temperature through tensile deformation (designated Txx 51), compressive deformation (Txx 52) or a combination of the two (Txx 54 -involving a re-strike of the die forging in the finish-forging die after quenching that both compresses and stretches the part). While application of tensile deformation has been found to result in an almost complete removal of quench-induced stresses [7,8] the technique is limited to parts that have a substantially uniform cross-section in the stretching direction [9] (e.g. sheet and plate products).…”

Section: Introductionmentioning

confidence: 99%

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Modelling stress reduction techniques of cold compression and stretching in wrought aluminium alloy products

Tanner

Robinson

2003

Finite Elements in Analysis and Design

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Heat treatable aluminium alloy aerospace products undergo a rapid quench from the solution heat treatment temperature into water / organic quenchant / spray quenching system to obtain their high strengths. As a result of this rapid quenching operation, residual stresses of yield strength magnitude can develop, leaving the material in an unsuitable condition for further machining operations and for service. Rectilinear, open-die forgings are generally cold compressed after quenching to relieve residual stresses. The effect of friction during cold compression between the forging and the steel compression platens, increasing / decreasing the amount of cold compression plastic deformation, natural ageing prior to cold compression, cold compression direction (LT v L v ST) and applying cold compression in 'bites' on residual stress magnitudes is not generally available. Residual stress development during quenching is modelled using the finite element technique and the effect on the final residual stress magnitude of varying these process parameters is evaluated. The effect of stretching to relieve residual stresses and the effect on residual stress magnitudes of sectioning samples of the material is also analysed using the finite element technique. The models of each of the stress relieving techniques are compared both by observing stress magnitudes and by using the FE model to predict the results from a layer removal technique.

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Section: Description Of Model -Materials and Elementssupporting

confidence: 64%

Section: As Quenched Stress Relief By Stretchingmentioning

confidence: 99%

Section: As Quenched Stress Relief By Stretchingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modelling stress reduction techniques of cold compression and stretching in wrought aluminium alloy products

Tanner

Robinson

2003

Finite Elements in Analysis and Design

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“…Robinson et al (2014) showed that surface RS measured by X-ray diffraction on AA7010 cold-water-quenched rectangular blocks increase when the thickness increases from 16 mm to 124 mm. Quenching is thus followed by a stress relief, as explained by Jeanmart and Bouvaist (1985), that reduces residual stresses by a factor of approximately 10 as shown by Boyer and Boivin (1985). An ageing treatment is performed to transform elements in solid solution into fine hardening precipitates and thus increase the yield strength.…”

Section: Introductionmentioning

confidence: 99%

Quench induced residual stress prediction in heat treatable 7xxx aluminium alloy thick plates using Gleeble interrupted quench tests

Chobaut

Carron

Arsène

et al. 2015

Journal of Materials Processing Technology

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a b s t r a c tIn this paper, a simple but realistic approach is presented to predict the as-quenched residual stress distribution in thick 7xxx aluminium alloy plates. Instead of modelling precipitation that occurs during quenching, a thermo-mechanical model is used whose parameters are identified using a limited number of tensile tests achieved after representative interrupted cooling paths in a Gleeble machine. The material behaviour law accounts for recovery at high temperature in a simple way and neglects the Bauschinger effect as suggested by a dedicated experiment. The results of this simple approach are compared to residual stress measurements in plates of different thicknesses for two different 7xxx alloys, AA7449 and AA7040.

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Residual stress prediction and determination in 7010 aluminum alloy forgings

Tanner

Robinson

2000

Experimental Mechanics

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Precipitation hardened aluminium alloys gain their high strength through heat treatment involving a severe quenching operation, which can have the adverse effect of introducing residual stresses. The finite element code ABAQUS is used to simulate the quenching of aluminium alloy 7010 in an attempt to predict the residual stress distribution that develops in simple shapes. The rate of heat transfer from the material is determined by using the finite element method to predict the heat transfer coefficient from surface cooling curves achieved experimentally. The flow stress of the material is assumed to be strain rate dependent and to behave in a perfectly plastic manner. The predicted residual stress magnitudes and directions are compared to values determined using the hole drilling strain gage method and the X-ray diffraction technique.

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Numerical calculations of residual–stress relaxation in quenched plates

Cited by 25 publications

References 2 publications

Modelling stress reduction techniques of cold compression and stretching in wrought aluminium alloy products

Modelling stress reduction techniques of cold compression and stretching in wrought aluminium alloy products

Quench induced residual stress prediction in heat treatable 7xxx aluminium alloy thick plates using Gleeble interrupted quench tests

Residual stress prediction and determination in 7010 aluminum alloy forgings

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