Time dependent hardness and residual stress reduction in a shot-peened aluminum alloy 2024-T351

2016 ◽  
Vol 58 (11-12) ◽  
pp. 997-1000
Author(s):  
Omar Suliman Zaroog ◽  
Mohd Rashdan Isa ◽  
Muhammad Zulhimi Bin Mohd Mohni
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Stress Reduction ◽  
Time Dependent ◽  
Aluminum Alloy 2024

FEM and Contour Method Study of Quenching Residual Stress of 7050 Aluminum Alloy Cross-Shaped Component

2017 ◽  
Vol 887 ◽  
pp. 89-95 ◽  
Author(s):  
Yang Li ◽  
Yun Xin Wu ◽  
Hai Gong ◽  
Feng Xiao
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Stress Distribution ◽  
Stress Reduction ◽  
Residual Stress Distribution ◽  
Contour Method ◽  
Fe Model ◽  
Residual Stress Field ◽  
Heat Transfer Theory ◽  
7050 Aluminum Alloy

In order to study the quenching residual stress of typical aluminum alloy component used in aerospace, the finite element (FE) model of quenching process of 7050 aluminum alloy cross-shaped component was established based on heat transfer theory and elastic-plastic mechanics theory, the distribution regularities of quenching residual stress field of cross-shaped component was analyzed. The results indicate that the residual stress distribution of web of cross-shaped component is similar to the residual stress distribution of thick plate, the large tensile stress concentration is exist in web plate and the connection part of the stiffener with a certain influence area. The error data of the component contour deformation were processed and the component deformation contour was fitted, which makes the test result of the contour method and FE simulation result have good consistency. The results of the study provides guidance for quenching residual stress reduction of aviation aluminum alloy components and provides the basis for calculating of machining deformation of monolithic component.

Numerical Simulation of Quenching and Pre-Stretching Residual Stress in 7085 Aluminum Alloy Plate

2016 ◽  
Vol 852 ◽  
pp. 211-217
Author(s):  
Hai Long Cao ◽  
Xi Wu Li ◽  
Ya Nan Li ◽  
Hong Wei Yan ◽  
Zhi Hui Li ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Stress Reduction ◽  
Transverse Direction ◽  
Rolling Direction ◽  
Reduction Ratio ◽  
Alloy Plate ◽  
Aluminum Alloy Plate ◽  
Simulation Results ◽  
Stress Simulation

The finite element method (FEM) was used to study the quenching and pre-stretching residual stresses of the 7085 aluminum alloy plate, combining with experimental measurement. Quenching residual stress simulation results showed that the stress of the rolling-direction and transverse-direction in the center were 16.5MPa and 9.2MPa, respectively. The stress of the rolling-direction and transverse-direction on the surface were-33.8MPa and-40.4MPa, respectively. The quenching residual stress simulation results were in good agreement with the X-ray diffraction experimental results. As the pre-stretching ratio increases, the quenching residual stress reduction ratio increases. The ratio of 2.0~3.0% pre-stretching can effectively release the quenching residual stress in aluminum alloy plates. After 3.0% pre-stretching, the stress of the rolling-direction and transverse-direction in the center were 0.9MPa and 1.8MPa, respectively. The stress of the rolling-direction and transverse-direction on the surface were-3.6MPa and-7.1MPa, respectively. The quenching residual stress reduction ratio reached above 80%.

scholarly journals Evolution of Stress and Strain in 2219 Aluminum Alloy Ring During Roll-Bending Process

2021 ◽  
Author(s):  
Hai Gong ◽  
Hua Tang ◽  
Tao Zhang ◽  
Fei Dei ◽  
Xiaolong Liu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Stress Distribution ◽  
Stress Reduction ◽  
Large Scale ◽  
Stress And Strain ◽  
Winding Number ◽  
Roll Bending ◽  
Bending Process ◽  
2219 Aluminum Alloy

Abstract The large quenched residual stress of large-scale aluminum alloy ring component induces severe deformation in the subsequent maching process. The conventional methods for reduction of residual stress (such as stepwise cold pressing and bulging) have little effect in the residual stress reduction for large-scale ring component and will induce inhomogeneous stress distribution. In this paper, roll bending process is adopted to reduce the quenched residual stress of 2219 aluminum alloy super-large ring. The numerical model of roll bending process was established, and the evolution and distribution of stress and strain after roll bending were studied. The influence of roll winding number on the uniformity of stress and strain was analyzed. The results show that the arch-shaped quenched residual stress of the ring changes to N-shaped distribution from inside to outside after roll bending process. The value of the residual stress reduces from ±180MPa in quenched state to the value within ±50MPa in roll bended state. With the increase of roll winding number, the stress uniformity is improved, but the stress reduction amplitude is basically the same. By analyzing the elastic-plastic strain distribution characteristics and strain springback law of the ring after roll bending, the formation mechanism of N-shaped residual stress distribution after roll bending is revealed.

scholarly journals Optimization Study of Post-Weld Heat Treatment for 12Cr1MoV Pipe Welded Joint

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 127
Author(s):  
Zichen Liu ◽  
Xiaodong Hu ◽  
Zhiwei Yang ◽  
Bin Yang ◽  
Jingkai Chen ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Stress Reduction ◽  
Simulation Method ◽  
Post Weld Heat Treatment ◽  
Residual Stress Field ◽  
Element Analysis ◽  
Tempering Treatment ◽  
Temper Heat Treatment ◽  
Weld Heat

In order to clarify the role of different post-weld heat treatment processes in the manufacturing process, welding tests, post-weld heat treatment tests, and finite element analysis (FEA) are carried out for 12C1MoV steel pipes. The simulated temperature field and residual stress field agree well with the measured results, which indicates that the simulation method is available. The influence of post-weld heat treatment process parameters on residual stress reduction results is further analyzed. It is found that the post weld dehydrogenation treatment could not release residual stress obviously. However, the residual stress can be relieved by 65% with tempering treatment. The stress relief effect of “post weld dehydrogenation treatment + temper heat treatment” is same with that of “temper heat treatment”. The higher the temperature, the greater the residual stress reduction, when the peak temperature is at 650–750 °C, especially for the stress concentration area. The longer holding time has no obvious positive effect on the reduction of residual stress.

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