Effects of segmented thermal-vibration stress relief process on residual stresses, mechanical properties and microstructures of large 2219 Al alloy rings

2021 ◽  
pp. 161269
Author(s):  
Hechuan Song ◽  
Hanjun Gao ◽  
Qiong Wu ◽  
Yidu Zhang
Keyword(s):  
Mechanical Properties ◽  
Residual Stresses ◽  
Stress Relief ◽  
Thermal Vibration ◽  
Al Alloy ◽  
Vibration Stress

scholarly journals Experimental Investigation of Vibration Stress Relief of A106 Steel Pipe T-Welded Fittings

2019 ◽  
Vol 25 (8) ◽  
pp. 52-61
Author(s):  
Hameed Dwech Lafta ◽  
Sarkawt Rostam ◽  
Fryad Jalal Mahmud ◽  
Ronya Osman Abdulrahman ◽  
Rebin Omer Ali ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Experimental Investigation ◽  
Residual Stresses ◽  
Vibration Frequency ◽  
Stress Relief ◽  
Steel Pipe ◽  
Pipe Fitting ◽  
Material Stability ◽  
Vibration Stress

This research examines the use of vibratory treatments to reduce residual stresses in small welded parts. In this experimental investigation, a post weld vibration treatment was applied to T- A106 steel pipe fitting specimens to study the effect of the treatment on the residual stress and the hardness of the material. The vibratory stress relief treatment was carried out at different vibration frequency. The results have demonstrated that post-weld vibratory stress relief of small size fittings is possible and residual stress may be relieved, and the treatment may be an alternative method for heat treatment especially when unchange in dimensions and material stability are required.  

scholarly journals Effect of Vibration Stress Relief on the Shape Stability of Aluminum Alloy 7075 Thin-Walled Parts

Metals ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 27 ◽  
Author(s):  
Hai Gong ◽  
Yanjie Sun ◽  
Yaoqiong Liu ◽  
Yunxin Wu ◽  
Yipeng He ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Residual Stresses ◽  
Dimensional Accuracy ◽  
Stress Relief ◽  
Structural Components ◽  
Shape Stability ◽  
Size Stability ◽  
Vibration Stress ◽  
Thin Walled ◽  
Aluminum Alloy 7075

Aluminum alloy 7075 is one of the materials widely used in the manufacture of structural components used by aviation industries. High precision is required in producing the shapes of such components due to shape stability and dimensional accuracy being difficult to maintain throughout the different stages of manufacturing. In this work, an experimental study of the effect of VSR (Vibratory Stress Relief) on the deformation and residual stresses of aluminum alloy 7075 thin-walled components is presented. It was concluded that VSR improved the shape and size stability of the material to a significant level by relieving induced residual stresses in the thin-walled parts. Finally, more uniform residual stress distribution was obtained after the VSR treatment, compared to before the VSR treatment. This proved that VSR has a significant influence on improving the shape stability of the thin-walled aluminum alloy 7075 components.

Research on Vibration Stress Relief for Cured SU-8 Photoresist Layer

2015 ◽  
Vol 1094 ◽  
pp. 487-490
Author(s):  
Qun Feng Yang ◽  
Jian Yi Zheng ◽  
Jun Qing Wang ◽  
Xue Nan Zhao ◽  
Da Yin Wei ◽  
...  
Keyword(s):  
Thin Film ◽  
Residual Stress ◽  
Residual Stresses ◽  
Stress Relief ◽  
Excitation Current ◽  
Photoresist Layer ◽  
Before And After ◽  
Vibration Stress ◽  
Vibration Time ◽  
Vibration Parameters

The aim of this work is to reduce the residual stress in cured SU-8 Photoresist layer by vibration stress relief (VSR) method. The vibration device was designed according to the results of the ANSYS modal simulation, which was used for the thin film VSR. Meanwhile, some important influencing factors, such as the excitation current and the vibration time, have been discussed. The residual stress in the SU-8 layer was measured by profile method, and the values of residual stresses in the SU-8 layer before and after VSR were compared. The experimental results show that residual stress in SU-8 layer can be effectively eliminated or homogenized by VSR if the proper vibration parameters were chosen in the experiment.

Thermal Vibration Compound Stress Relief on Thick DH36 Steel Welded Plates

2014 ◽  
Vol 576 ◽  
pp. 143-147 ◽  
Author(s):  
Shu Qi Li ◽  
Hong Yuan Fang ◽  
Xue Song Liu ◽  
Wei Cui
Keyword(s):  
Weld Line ◽  
Stress Relief ◽  
Thermal Vibration ◽  
Oil Platforms ◽  
Additional Heating ◽  
Offshore Oil Platforms ◽  
Before And After ◽  
Vibration Stress ◽  
Transverse Stresses ◽  
Offshore Oil

Stress relief on thick and large welded components is greatly needed in various applications, such as large oil transporting pipes and offshore oil platforms. Vibration stress relief (VSR) is an relatively new method for this purpose. The efficiency of this method is a key subject, especially when the components are extremely large and it is difficult to trigger sufficient vibration amplitude in the structures. In this study, additional heating on the area near the weld line was used to promote the efficiency of VSR. Both VSR and thermal-vibration compound stress relief (TVCSR) were used to 50mm thick DH 36 steel welded plates. The Longitudinal and transverse stresses near the weld lines before and after the treatments were investigated. Comparing to VSR, the TVCSR was more effective in decreasing the residual stress. Effects of additional heating was discussed.

ffect of Na2WO4 in electrolyte on mechanical properties of oxide layer on Al alloy via plasma electrolytic oxidation

2015 ◽  
Vol 53 (8) ◽  
pp. 535-540 ◽  
Author(s):  
Young Gun Ko ◽  
Dong Hyuk Shin ◽  
Hae Woong Yang ◽  
Yeon Sung Kim ◽  
Joo Hyun Park ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oxide Layer ◽  
Plasma Electrolytic Oxidation ◽  
Al Alloy ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Effect of aluminum content on structure, transport and mechanical properties of Sn-Zn eutectic lead free solder alloy rapidly solidified from melt.

2015 ◽  
Vol 10 (1) ◽  
pp. 2641-2648
Author(s):  
Rizk Mostafa Shalaby ◽  
Mohamed Munther ◽  
Abu-Bakr Al-Bidawi ◽  
Mustafa Kamal
Keyword(s):  
Mechanical Properties ◽  
Melting Point ◽  
Lead Free ◽  
Al Alloy ◽  
Lead Free Solder ◽  
Pronounced Increase ◽  
Mass Unit ◽  
Size Refinement ◽  
Free Solder ◽  
Lead Free Solders

The greatest advantage of Sn-Zn eutectic is its low melting point (198 oC) which is close to the melting point. of Sn-Pb eutectic solder (183 oC), as well as its low price per mass unit compared with Sn-Ag and Sn-Ag-Cu solders. In this paper, the effect of 0.0, 1.0, 2.0, 3.0, 4.0, and 5.0 wt. % Al as ternary additions on melting temperature, microstructure, microhardness and mechanical properties of the Sn-9Zn lead-free solders were investigated. It is shown that the alloying additions of Al at 4 wt. % to the Sn-Zn binary system lead to lower of the melting point to 195.72 ˚C.  From x-ray diffraction analysis, an aluminium phase, designated α-Al is detected for 4 and 5 wt. % Al compositions. The formation of an aluminium phase causes a pronounced increase in the electrical resistivity and microhardness. The ternary Sn-9Zn-2 wt.%Al exhibits micro hardness superior to Sn-9Zn binary alloy. The better Vickers hardness and melting points of the ternary alloy is attributed to solid solution effect, grain size refinement and precipitation of Al and Zn in the Sn matrix.  The Sn-9%Zn-4%Al alloy is a lead-free solder designed for possible drop-in replacement of Pb-Sn solders.  

Effect of the Weld Joint Configuration on Stressed Components, Residual Stresses and Mechanical Properties

2014 ◽  
Vol 56 (4) ◽  
pp. 279-284 ◽  
Author(s):  
Bekir Çevik ◽  
Alpay Özer ◽  
Yusuf Özçatalbaş
Keyword(s):  
Mechanical Properties ◽  
Residual Stresses ◽  
Weld Joint ◽  
Joint Configuration
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