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

2020 ◽  
Vol 34 ◽  
pp. 02007
Author(s):  
Marin Petre ◽  
Cristian Dinu ◽  
Nicuşor Constantin Drăghici ◽  
Valeriu Andrei
Keyword(s):  
Residual Stresses ◽  
Mathematical Modelling ◽  
Aluminium Alloy ◽  
Thermal Effects ◽  
Coupled Analysis ◽  
Principal Stresses ◽  
Alloy Plate ◽  
Finite Element Software ◽  
Quenching Process ◽  
6061 Aluminium Alloy

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.

scholarly journals Mathematical modelling of the quenching process of 6061 aluminium alloy plates

2020 ◽  
Vol 34 ◽  
pp. 02008
Author(s):  
Marin Petre ◽  
Raluca Efrem ◽  
Nicuşor Constantin Drăghici ◽  
Alexandra Valerica Achim
Keyword(s):  
Mathematical Modelling ◽  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Rapid Quenching ◽  
Coupled Analysis ◽  
Quenching Rate ◽  
Alloy Plate ◽  
Finite Element Software ◽  
Quenching Process ◽  
6061 Aluminium Alloy

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.

Simulation of carburizing-quenching of a gear. Effect of carbon content on residual stresses and distortion

2004 ◽  
Vol 120 ◽  
pp. 489-497
Author(s):  
R. Mukai ◽  
D.-Y. Ju
Keyword(s):  
Residual Stress ◽  
Phase Transformation ◽  
Carbon Steel ◽  
Residual Stresses ◽  
Three Dimensional ◽  
Helical Gear ◽  
Coupled Analysis ◽  
Transformation Plasticity ◽  
Quenching Process ◽  
Thermal Physical Properties

Predictions of deformation, residual stresses and hardness after heat treatment of gears by numerical simulation are very useful to determine optimum condition to decrease the distortion of machinery parts. In this paper, simulation on carburizing quenching of a helical gear made of carbon steel SCr420 was carried out using three-dimensional coupled analysis based on thermo-mechanical theory considering phase transformation. The expansion and latent heat due to phase transformation at various carburizing conditions were measured by TMA and DSC to determine the thermal physical properties of SCr420 carbon steel. The influence of the transformation plasticity strain on deformation, residual stress and hardness of a gear was clarified in the simulation. The accuracy of simulation also is verified by the comparison between the experimental data and the simulated result of the distortion and residual stress. From the predicted results, improvement of the hardness and strength on surface of the gear due to the carburizing-quenching process can be verified.

A Study of Quenching: Experiment and Modelling

1992 ◽  
Vol 114 (3) ◽  
pp. 309-316 ◽  
Author(s):  
B. Aksel ◽  
W. R. Arthur ◽  
S. Mukherjee
Keyword(s):  
Residual Stresses ◽  
Mathematical Modelling ◽  
Deformation Behavior ◽  
Inelastic Deformation ◽  
Subject Area ◽  
Future Research ◽  
Benchmark Problem ◽  
Quenching Process ◽  
Residual Curvature ◽  
Mathematical Modelling And Simulation

This paper describes the design, execution, mathematical modelling, and simulation of a simple, yet very useful quenching experiment—the asymmetric one-sided quenching of a beam. This experiment yields valuable information regarding the mechanical variables at the end of a quenching process, without the need for measurement of residual stresses in the quenched object. The final (residual) curvature of the beam is strongly sensitive to the inelastic deformation behavior of the material of the quenched object. This problem—experiment and simulation—is recommended as a benchmark problem for future research in this subject area.

Residual stresses induced by electron beam welding in a 6061 aluminium alloy

2016 ◽  
Vol 235 ◽  
pp. 1-12 ◽  
Author(s):  
D. Bardel ◽  
D. Nelias ◽  
V. Robin ◽  
T. Pirling ◽  
X. Boulnat ◽  
...  
Keyword(s):  
Electron Beam ◽  
Residual Stresses ◽  
Aluminium Alloy ◽  
Electron Beam Welding ◽  
6061 Aluminium Alloy

scholarly journals Surface Hardening of Aluminium Alloy with Addition of Zinc Particles by Friction Stir Processing

2020 ◽  
Vol 10 (1) ◽  
pp. 408-414
Author(s):  
Nurul Muhayat ◽  
Alvian Restu Putra Utama ◽  
Keyword(s):  
Mechanical Alloying ◽  
Physical Properties ◽  
Aluminium Alloy ◽  
Friction Stir Processing ◽  
Surface Hardening ◽  
Alloy Plate ◽  
Friction Stir ◽  
Material Hardness ◽  
Mechanical And Physical Properties ◽  
Uppermost Layer

AbstractMechanical alloying can be carried out by a method known as friction stir processing, whereby solid Zn particles in a solution are distributed onto an aluminium alloy plate. The aim of this study was to determine the effects of a volume of Zn particles on the mechanical and physical properties of aluminium 1xxx alloy that had been subjected to friction stir processing. The specimens were plates composed of 1xxx series aluminium. A groove, measuring 12 mm in diameter, was pierced to various depths, and the Zn particles in these containers were then subjected to friction stir processing using a pin-less tool with a diameter of 15 mm. The results showed that the highest hardness was found in the uppermost layer of the workpiece, and this gradually decreased with thickness. An increase in the amount of Zn particles caused an increase in material hardness. The highest hardness of 87.1 HV in the friction stir-processed AA1100 was obtained at the highest volume of Zn compared to the hardness of 44.5 HV, which was obtained for the specimen without the addition of Zn.

Surface Modification Analysis after Shot Peening of AA 7075 in Different States

2013 ◽  
Vol 768-769 ◽  
pp. 519-525 ◽  
Author(s):  
Sebastjan Žagar ◽  
Janez Grum
Keyword(s):  
Residual Stress ◽  
Surface Layer ◽  
Residual Stresses ◽  
Aluminium Alloy ◽  
Shot Peening ◽  
Fatigue Testing ◽  
Stress Profile ◽  
Treatment Conditions ◽  
Stress Profiles ◽  
Compressive Residual Stresses

The paper deals with the effect of different shot peening (SP) treatment conditions on the ENAW 7075-T651 aluminium alloy. Suitable residual stress profile increases the applicability and life cycle of mechanical parts, treated by shot peening. The objective of the research was to establish the optimal parameters of the shot peening treatment of the aluminium alloy in different precipitation hardened states with regard to residual stress profiles in dynamic loading. Main deformations and main residual stresses were calculated on the basis of electrical resistance. The resulting residual stress profiles reveal that stresses throughout the thin surface layer of all shot peened specimens are of compressive nature. The differences can be observed in the depth of shot peening and the profile of compressive residual stresses. Under all treatment conditions, the obtained maximum value of compressive residual stress ranges between -200 MPa and -300 MPa at a depth between 250 μm and 300 μm. Comparison of different temperature-hardened aluminium alloys shows that changes in the Almen intensity values have greater effect than coverage in the depth and profile of compressive residual stresses. Positive stress ratio of R=0.1 was selected. Wöhler curves were determined in the areas of maximum bending loads between 30 - 65 % of material's tensile strength, measured at thinner cross-sections of individual specimens. The results of material fatigue testing differ from the level of shot peening on the surface layer.

scholarly journals Influence of Aging on Corrosion Behaviour of the 6061 Cast Aluminium Alloy

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1821
Author(s):  
Ting He ◽  
Wei Shi ◽  
Song Xiang ◽  
Chaowen Huang ◽  
Ronald G. Ballinger
Keyword(s):  
Aluminium Alloy ◽  
Laser Scanning ◽  
Corrosion Behaviour ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Kelvin Probe ◽  
Force Microscopy ◽  
The Matrix ◽  
6061 Aluminium Alloy

The influence of AlFeSi and Mg2Si phases on corrosion behaviour of the cast 6061 aluminium alloy was investigated. Scanning Kelvin probe force microscopy (SKPFM), electron probe microanalysis (EPMA), and in situ observations by confocal laser scanning microscopy (CLSM) were used. It was found that Mg2Si phases were anodic relative to the matrix and dissolved preferentially without significantly affecting corrosion propagation. The AlFeSi phases’ influence on 6061 aluminium alloy local corrosion was greater than that of the Mg2Si phases. The corroded region width reached five times that of the AlFeSi phase, and the accelerating effect was terminated as the AlFeSi dissolved.

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