Experimental and numerical study of quenching complex-shaped metallic alloys with multiple, overlapping sprays

Hall, David D.; Mudawar, Issam

doi:10.1016/0017-9310(94)00244-p

Cited by 90 publications

(35 citation statements)

References 12 publications

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“…Spray cooling or quenching of hot metallic surfaces has also been extensively studied. [94,95,96,97,98,99] Many empirical heat transfer correlations for spray cooling applications exist.…”

Section: A Introductionmentioning

confidence: 99%

Characterization and identification of super-effective thermal fire extinguishing agents :

Pitts¹,

Yang²,

Bryant³

et al. 2006

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“…Spray cooling or quenching of hot metallic surfaces has also been extensively studied. [94,95,96,97,98,99] Many empirical heat transfer correlations for spray cooling applications exist.…”

Section: A Introductionmentioning

confidence: 99%

Characterization and identification of super-effective thermal fire extinguishing agents :

Pitts¹,

Yang²,

Bryant³

et al. 2006

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“…In addition, the specific water flux (i.e., the water flow rate impinging on a unit area of the test surface) and the spray droplet sizes are generally much larger with conventional water sprays so that previously published data for these systems are not necessarily applicable to air-assisted atomized water sprays; for example, see Hall and Mudawar. [2] Although Buckingham and Haji-Sheikh. [3] studied the fundamental mechanisms involved in air-water spray cooling of high temperature cylindrical surfaces, they presented only overall water flow rates (instead of water fluxes), and this, together with the cylindrical geometry, makes it difficult to apply their data for the design of air-water spray systems.…”

Section: Introductionmentioning

confidence: 98%

Quenching of aerospace forgings from high temperatures using air-assisted, atomized water sprays

Oliveira

Ward

Garwood

et al. 2002

J. of Materi Eng and Perform

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The nickel-based superalloy or titanium materials used in the aerospace industry are cooled from high temperatures during the heat treatment process to obtain appropriate strength properties. However, unacceptably high residual stresses can be developed in some situations if the rate of cooling is too high so that air-assisted, atomized water sprays have been suggested as an alternative to the widely used techniques of quenching in oil or water. Thus, this article examines two aspects of the use of air-water sprays for quenching aeroengine forgings. First, basic experimental heat transfer data are presented for a wide range of water flows and for surface temperatures up to approximately 850°C, for both plane and recessed surfaces. Second, the heat transfer data are used in numerical simulations to study the influence of nonuniform spray distributions on the residual stress patterns in a typical forging.

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“…Spray cooling cannot be used because of the presence of some temperature and humidity sensitive components of the press and CPE equipment. Quench concepts with high cooling rates provide the danger of profile geometrical distortion as a result of the inhomogeneous thermal expansion and plastic deformations in the cross sections [7]. [2] design is a forced air driven impingement stream cooling system consisting of 8 nozzles set in a ring shape arrangement, which is placed around the extrusion.…”

Section: Introductionmentioning

confidence: 99%

Influence of cooling rate on distortion and microstructure in extrusion of Al-Mg-Si alloys

et al. 2009

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The technology of the curved profile extrusion (CPE) offers a potential for manufacturing of three dimensional curved profiles in one process by using a conventional die in combination with a generalized moveable guiding tool. To utilize the full potential of the CPE process for the production of lightweight construction components, particularly in regarding to the required mechanical properties and therefore the microstructure development, an embedded controlled quench system is necessary. A forced air quench system was designed, built and tested on extrusion of thin wall aluminum tubes. Homogeneous as well as partial quenching strategies were carried out in interaction with the CPE process. Manufacturing of straight profiles in a narrow range of tolerance is possible and unproblematic. In case of reproducible shape distortion thermally caused distortion can be compensated by deflection using the proposed CPE strategy. The cooling efficiency of the forced air quenching system was investigated by analyzing the microstructure and the mechanical properties of quenched profiles in different quenching and temper conditions. Using the process heat of extrusion for solution heating the formation of peripheral coarse grains in the alloy EN AW-6082 can be nearly eliminated at low ram speed. After aging, hardness and tensile strength were measured. Mechanical properties up to T4 and T6 temper conditions could be achieved by air quenching and aging.

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Experimental and numerical study of quenching complex-shaped metallic alloys with multiple, overlapping sprays

Cited by 90 publications

References 12 publications

Characterization and identification of super-effective thermal fire extinguishing agents :

Characterization and identification of super-effective thermal fire extinguishing agents :

Quenching of aerospace forgings from high temperatures using air-assisted, atomized water sprays

Influence of cooling rate on distortion and microstructure in extrusion of Al-Mg-Si alloys

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