Design of the multi-stage quenching process for 7050 aluminum alloy

Zhang, Jin; Deng, Yunlai; Wang, Yang; Hu, Shanshan; Zhang, Xinming

doi:10.1016/j.matdes.2013.09.029

Cited by 29 publications

(16 citation statements)

References 26 publications

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“…3. Figure 4a, experimentation [1][2][3][4][5][6][7] justifying the method of calculation. As the water near the metal piece is above 100°C, except for the 10 mm square, vapour blanket exists beyond 200 s for other samples.…”

Section: Resultsmentioning

confidence: 86%

“…At 800°C, the values were equal to 500 W/(m 2 K) and 3200 W/(m 2 K), for mineral oils and a polymer coolant, respectively. Jin Zhang et al [7] observed that the residual stresses due to single stage quenching can be reduced by applying multi-stage quenching to obtain good hardenability of aluminum alloy. Cold water quenching provides corrosion resistance for aluminum alloys in the form of sheets, extrusions, tubing and small forgings.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Heat Transfer During Quenching Process

Madireddi

Krishnan

Reddy

2016

J. Inst. Eng. India Ser. C

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A numerical model is developed to simulate the immersion quenching process of metals. The time of quench plays an important role if the process involves a defined step quenching schedule to obtain the desired characteristics. Lumped heat capacity analysis used for this purpose requires the value of heat transfer coefficient, whose evaluation requires large experimental data. Experimentation on a sample work piece may not represent the actual component which may vary in dimension. A FluidStructure interaction technique with a coupled interface between the solid (metal) and liquid (quenchant) is used for the simulations. Initial times of quenching shows boiling heat transfer phenomenon with high values of heat transfer coefficients (5000-2.5 9 10 5 W/m 2 K). Shape of the work piece with equal dimension shows less influence on the cooling rate Non-uniformity in hardness at the sharp corners can be reduced by rounding off the edges. For a square piece of 20 mm thickness, with 3 mm fillet radius, this difference is reduced by 73 %. The model can be used for any metalquenchant combination to obtain time-temperature data without the necessity of experimentation.

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Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Heat Transfer During Quenching Process

Madireddi

Krishnan

Reddy

2016

J. Inst. Eng. India Ser. C

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“…In our analysis, the observation path is along the thickness direction, which is shown as the thick line in Figure 2. Cooling curves during quenching were obtained by using the finite element simulation using the parameters (heat-transfer coefficient, thermal conductivity, and heat capacity) that are all readily available in the literature by Deng et al [11]. For subsequent predictions, these parameters were also used to calculate the temperature field evolution.…”

Section: Quenching Experiments and Heat Transfer Analysismentioning

confidence: 99%

“…The sample was placed vertically in both the furnace and spray quenching equipment. The cooling curves during quenching were obtained via a finite element simulation using parameters (heat transfer coefficient, thermal conductivity, and heat capacity) that are all readily available in the literature by Deng et al [11]. A 5 mm-deep drilled perpendicular at the surface for thermocouples was prepared for temperature measurements.…”

Section: Quenching Experiments and Heat Transfer Analysismentioning

confidence: 99%

Prediction and Experimental of Yield Strengths of As-Quenched 7050 Aluminum Alloy Thick Plates after Continuous Quench Cooling

Chen

Liu

et al. 2019

Metals

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The aim of this study was to predict the yield strength of as-quenched aluminum alloys according to their continuous quench cooling path. Our model was established within the framework of quench factor analysis (QFA) by representing a quenching curve as a series of consecutive isothermal transformation events and adding the yield strength increments after each isothermal step to predict the yield strength after continuous quench cooling. For simplification; it was considered that the effective hardeners during quenching were the nanosized solute clusters formed at low temperatures, whereas the other coarse precipitates were neglected. In addition, quenching tests were conducted on aluminum plates with different thicknesses. The predictions were compared with the experimental measurements, and the results showed that the predictions fit the measurements well for the 40-and 80-mm-thick plates but overestimated the as-quenched yield strength at the mid-thickness of the 115-mm-thick plates.

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“…[4][5][6] 7050 aluminum alloy is an important aeronautic material. [7][8][9] Knowing the attenuation characteristics of ultrasonic waves in 7050 aluminum alloy can not only improve the nondestructive testing techniques, but can also enhance evaluation performance process of aeronautic industries.…”

Section: Introductionmentioning

confidence: 99%

A modified model for simulating the effect of temperature on ultrasonic attenuation in 7050 aluminum alloy

Han

Gong

et al. 2018

AIP Advances

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Knowing propagating properties of an ultrasonic wave can enhance the non-destructive testing techniques in alloy materials field, such as the electromagnetic acoustic transducer techniques, and the piezoelectric ultrasonic transducer techniques. When temperature is taken into consideration, the ultrasonic propagating attenuation become very complex process. In this paper, a loss factor coefficient function with change in temperatures is established and the loss factor damping model with temperature term is coupled into the equations of elastic wave motion. A modified frequency domain model for calculating the ultrasonic attenuation due to temperature changes in 7050 Aluminum alloy is then developed. The model is validated experimentally using a high power pulse transmitter/receiver RPR-4000, a resistant high temperature electromagnetic acoustic transducer set-up and a 7050 Aluminum alloy sample. The simulation and the experimental results are determined to be in good agreement. The numerical model is used to calculate the ultrasonic-waves field, the ultrasonic attenuation, and the ultrasonic propagation directivity considering the temperature effect. The modeling results indicate that the ultrasonic energy attenuation is significantly affected by temperature. When the temperature increases from 20 • C up to 480 • C, the ultrasonic energy attenuates by 32.31%. It is also found that the length of near acoustic field increases with the increase in temperature. There is a common basic mode for the attenuation of ultrasonic waves, in which the attenuated mode cannot be affected by other factors. Increasing the temperature or the frequency, the ultrasonic propagation can obtain an excellent directivity. Results obtained from the present model will provide a comprehensive understanding of design parameter effects and consequently improve the design/performance in the non-destructive testing techniques.

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Design of the multi-stage quenching process for 7050 aluminum alloy

Cited by 29 publications

References 26 publications

Numerical Analysis of Heat Transfer During Quenching Process

Numerical Analysis of Heat Transfer During Quenching Process

Prediction and Experimental of Yield Strengths of As-Quenched 7050 Aluminum Alloy Thick Plates after Continuous Quench Cooling

A modified model for simulating the effect of temperature on ultrasonic attenuation in 7050 aluminum alloy

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