Quenching of Aerospace Forgings from High Temperatures Using Air-Assisted, Atomized Water Sprays

Oliveira, Mónica; Ward, John; Garwood, D. R.; Wallis, R.A.

doi:10.1361/105994902770344439

Cited by 7 publications

(3 citation statements)

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“…The classical FEM plastic deformation modeling based on the rheological data of the alloy currently covers all technologies, allowing you to get the T , ε, fields on all transitions: forging, stamping, sheet and section rolling, ring rolling. Classical FEM modeling allows simulating the residual stresses during quenching with non-equilibrium conditions [18] .…”

Section: Modelingmentioning

confidence: 99%

Progress and status in wrought processing of titanium alloys

Ледер¹,

Волков²

2020

MATEC Web Conf.

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1. Introduction All the main practical directions and methods of plastic deformation were developed in the 19th century in application for structural steels and in many respects were successfully adapted for titanium alloys taking into account their features: low thermal conductivity, high viscosity, tendency to sticking, gas saturation, hydrogen embrittlement, etc. At the moment, most of the methods: free forging, pressing, sorting and sheet rolling, drawing, etc., are very detailed for particular cases of geometries, mechanical properties and alloys classes. Manufacturers need only to optimize the processes of deformation using a reasonable choice and refinement of technological ranges, optimization of tools and workpieces, approaches to the development of the process. Despite partial repetitions and re-discoveries of already well-known progress, it did not stop, but simply moved to other levels and scales, and without becoming less interesting and succinct, although it may be, giving less ambitious results. 2. Results and discussion General situation Despite the potential threats from alternative technologies: powder technologies and additive technologies, according to [ 1 ], the forging business is growing steadily enough: 60% of surveyed companies stated growth in 2018 by + 5 ÷ 25%, and also in the forecast of growth in 2019 year at about the same pace (Fig. 1 a). For 5 years from 2014, relative stagnation of growth was observed only on the results of 2 years: 2014 and 2017. According to the prevalence of production, titanium alloys, of course, cannot compete with carbon , alloyed and stainless steel , which produce > 50% of forging companies. But titanium alloys are comparable in prevalence with Al and hi temperature alloys (Fig. 1b) , possibly due to use in the same aerospace region. In 2018, almost 20% decrease in the number of forging companies producing titanium and hi temperature alloys , even with the normalization of the results (Fig. 1 c). It is difficult to reconcile with the growing market for aerospace and it is possible that this result is due to the change of the spectrum of companies of choice, or a decrease of number of players due to market globalization wrought titanium alloys .

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Section: Modelingmentioning

confidence: 99%

Progress and status in wrought processing of titanium alloys

Ледер¹,

Волков²

2020

MATEC Web Conf.

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“…In the conventional spray methods, the hot plate is covered by the vapour film at the initial stage of cooling and as a consequence the heat transfer rate is drastically reduced [7,8].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement using air-atomized spray cooling with water–Al2O3 nanofluid

Ravikumar

Haldar

Jha

et al. 2015

International Journal of Thermal Sciences

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“…The most important part for hardening steel results from the cooling of the body in a liquid or a gas that rapidly extracts heat. A good description of the operations performed during heat treating of steel is available in Totten et al (1993) and De Oliveira et al (2002). It was stated that the rate of cooling in the heated body depends on the heat removal characteristics of the cooling medium (e.g.…”

Section: Introductionmentioning

confidence: 99%

Immersed volume method for solving natural convection, conduction and radiation of a hat‐shaped disk inside a 3D enclosure

Hachem

Digonnet

Massoni

et al. 2012

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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Purpose -The purpose of this paper is to present an immersed volume method that accounts for solid conductive bodies (hat-shaped disk) in calculation of time-dependent, three-dimensional, conjugate heat transfer and fluid flow. Design/methodology/approach -The incompressible Navier-Stokes equations and the heat transfer equations are discretized using a stabilized finite element method. The interface of the immersed disk is defined and rendered by the zero isovalues of a level set function. This signed distance function allows turning different thermal properties of each component into homogeneous parameters and it is coupled to a direct anisotropic mesh adaptation process enhancing the interface representation. A monolithic approach is used to solve a single set of equations for both fluid and solid with different thermal properties. Findings -In the proposed immersion technique, only a single grid for both air and solid is considered, thus, only one equation with different thermal properties is solved. The sharp discontinuity of the material properties was captured by an anisotropic refined solid-fluid interface. The robustness of the method to compute the flow and heat transfer with large materials properties differences is demonstrated using stabilized finite element formulations. Results are assessed by comparing the predictions with the experimental data. Originality/value -The proposed method demonstrates the capability of the model to simulate an unsteady three-dimensional heat transfer flow of natural convection, conduction and radiation in a cubic enclosure with the presence of a conduction body. A previous knowledge of the heat transfer coefficients between the disk and the fluid is no longer required. The heat exchange at the interface is solved and dealt with naturally.

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Quenching of Aerospace Forgings from High Temperatures Using Air-Assisted, Atomized Water Sprays

Cited by 7 publications

References 0 publications

Progress and status in wrought processing of titanium alloys

Progress and status in wrought processing of titanium alloys

Heat transfer enhancement using air-atomized spray cooling with water–Al2O3 nanofluid

Immersed volume method for solving natural convection, conduction and radiation of a hat‐shaped disk inside a 3D enclosure

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