Control of Distortion in Aluminium Heat Treatment

Rashed, Hossain M.M.A.

doi:10.1016/b978-0-08-102063-0.00013-8

Cited by 9 publications

(5 citation statements)

References 69 publications

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“…It further increased to 152 MPa with 1.0% Cr particles inclusion, which is the maximum UTS recorded among the test samples. This increment in the UTS values could be ascribed to the ability of Cr particles to reduce plastic deformation on the matrix of Al-Mg-Si alloy [59,60], and this indicated that this alloy sample offered the largest restrain to peripheral pulling, compared to other samples [61,62]. The reason for the large decrease in the UTS on the addition of 1.5% Cr particles to Al-Mg-Si alloy could be due to defects in the test region.…”

Section: Ultimate Tensile Strength (Uts)mentioning

confidence: 99%

Investigation of Mechanical, Corrosion and Microstructural Behaviour of Heat Treated Cr-Modified Al-Mg-Si Alloy

Ajide,

Adelakun,

Akande

et al. 2023

JERR

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Despite the choice of Al-Mg-Si alloy as a material for innumerable industrial and structural applications, challenges such as undesired scratch resistance, formability and mechanical properties deterioration in saline environment hinders the extent of its application for automotive and aerospace components. Nevertheless, with the growing interest in the application of Al-Mg-Si alloy in automotive and aerospace industries, there is need for cautious control of thermal treatments and inclusion of alloying elements with requisite potentials for enhancing the microstructure and mechanical properties of the alloy. Chromium is known to improve strength and corrosion resistance in several applications. Therefore, this study focuses on the investigation of the effect of Cr particles inclusion in Al-Mg-Si alloy. The effect of ageing heat treatment on selected properties of Al-Mg-Si-Cr alloy was also studied in this work. The Al-Mg-Si and Al-Mg-Si-Cr alloys were developed using a two-step stir casting technique. Chromium was added to Al-Mg-Si alloy at varying percentages of 0, 0.5, 1.0, 1.5, 2.0 and 2.5. All the samples were solution treated in an electric furnace at 500 oC for 30 minutes and water quenched. Then the samples were artificially aged at 210 oC for 3 hours and quenched in natural air. The hardness test revealed that the inclusion of Cr particles in Al-Mg-Si alloy samples increased hardness from 35.03 Kgf/mm2 (hardness of Al-Mg-Si-0%Cr alloy sample) to a maximum value of 126.54 Kgf/mm2 (hardness of Al-Mg-Si-1.5%Cr alloy sample). After heat treatment, the hardness of Al-Mg-Si-0%Cr alloy sample increased to 80.84 Kgf/mm2, while that of Al-Mg-Si-1.5%Cr alloy sample decreased slightly to 120.88 Kgf/mm2. The impact strength test also showed that the inclusion of Cr in Al-Mg-Si alloy increased impact strength from 9.52 J/mm2 (impact strength of Al-Mg-Si-0%Cr alloy sample) to a maximum value of 19.04 J/mm2 (impact strength of Al-Mg-Si-2.0%Cr alloy sample). After heat treatment, the impact strength of Al-Mg-Si-0%Cr alloy sample increased marginally to 10.09 J/mm2, while that of Al-Mg-Si-2.0%Cr alloy sample decreased slightly to 17.57 J/mm2. The tensile and electrochemical tests revealed that the heat-treated Al-Mg-Si-1.0%Cr alloy sample exhibited the highest tensile strength and lowest corrosion rate of 152 MPa and 0.0014 mm/year, respectively. The microstructural examination further revealed that the inclusion of Cr particles in Al-Mg-Si alloy improved its surface morphology. Al-Mg-Si-1.0%Cr alloy sample was adjudged to possess the best microstructural properties. Therefore, this sample is recommended as a potential material for machine tools and other structural or advanced manufacturing applications.

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Section: Ultimate Tensile Strength (Uts)mentioning

confidence: 99%

Investigation of Mechanical, Corrosion and Microstructural Behaviour of Heat Treated Cr-Modified Al-Mg-Si Alloy

Ajide,

Adelakun,

Akande

et al. 2023

JERR

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“…It was assumed that the phase transition does not change during the quenching process. Since the rolling before quenching has little effect on the quenching residual stress [10,16], the zero stress state is considered as the initial state.…”

Section: The Mathematical Modelmentioning

confidence: 99%

Mathematical modelling of the quenching process of 6061 aluminium alloy plates

Petre¹,

Efrem

Drăghici³

et al. 2020

ITM Web Conf.

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In recent decades, due to the increase in computing power, mathematical modelling has experienced a fulminant development in almost all areas. The aluminium industry is one of these areas. One of the main processes for improving the properties of certain aluminium alloys is the solution heat treatment and quenching process. The most common quenchant used for aluminium alloys is water. The main advantage of using a water quenchant is that water can provide the rapid quenching. By considering the temperature dependence of the thermo-physical properties, the non-linear thermo-mechanical direct coupled analysis of the quenching process for a 6061 aluminium alloy plate was achieved. The structural stress due to solid thermal eﬀects were studied by using ANSYS ﬁnite element software. The quenching rate, which determines the plate deformation after quenching, was estimated and validated on independent equipment for the research of aluminium alloy quenching process. The developed mathematical model serves as a tool by simulation of various scenarios that may occur in the industrial process.

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“…After a short period of time, of the order of seconds, the inside of the plate begins to cool and contract. However, the contraction process is limited by the already quenched outer layer of the plate, which causes internal tensile stresses and which will be balanced by the external compression stresses [1]. The typical residual stresses after quenching process follow an M-shaped profile [2].…”

Section: Introductionmentioning

confidence: 99%

Prediction of the residual stress after quenching of 6061 aluminium alloy plates by using mathematical modelling

Petre¹,

Dinu

Drăghici³

et al. 2020

ITM Web Conf.

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The purpose of this article is to better understand the behavior of the residual stresses in aluminium alloy plates by using mathematical modelling. Quenching of aluminium alloy plates causes an uneven temperature variation in aluminum alloy plates, and elastic and elasto-plastic deformations occur inside the material. The latter causing the formation of deformations and residual stresses. The non-linear thermo-mechanical direct coupled analysis of the quenching process for a 6061 aluminium alloy plate was achieved by using ANSYS ﬁnite element software. The residual stresses due to solid thermal effects were determined by calculation of the Third principal stresses, the most negative or compressive. The developed mathematical model oﬀers a support in the understanding the behavior of the residual stresses in aluminium alloy plates and a better control of them.

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Control of Distortion in Aluminium Heat Treatment

Cited by 9 publications

References 69 publications

Investigation of Mechanical, Corrosion and Microstructural Behaviour of Heat Treated Cr-Modified Al-Mg-Si Alloy

Investigation of Mechanical, Corrosion and Microstructural Behaviour of Heat Treated Cr-Modified Al-Mg-Si Alloy

Mathematical modelling of the quenching process of 6061 aluminium alloy plates

Prediction of the residual stress after quenching of 6061 aluminium alloy plates by using mathematical modelling

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