Effect of Deep Cryogenic Treatment on Microstructure of 5A06 Aluminum Alloy MIG Welded Joint

2012 ◽  
Vol 724 ◽  
pp. 182-185 ◽  
Author(s):  
Shan Gao ◽  
Zhi Sheng Wu ◽  
Peng Fei Jin ◽  
Jun Jie Wang ◽  
Peng Shuai
Keyword(s):  
Aluminum Alloy ◽  
Arc Welding ◽  
Welded Joint ◽  
Cryogenic Treatment ◽  
Liquid Nitrogen Temperature ◽  
Inert Gas ◽  
Dispersion Strengthening ◽  
Welding Wire ◽  
Deep Cryogenic Treatment ◽  
5A06 Aluminum Alloy

5A06 aluminum alloy welding was obtained by using SAlMg-3 as welding wire with MIG (metal inert gas arc welding). The welded joint with deep cryogenic treatment at liquid nitrogen temperature (-155) for 4h, 8h, 10h were analyzed by metallographic and XRD examination. The results have shown that a lot of subgrain appears in the microstructure of the welded joint resulting in the refined grain after cryogenic treatment. The obvious increasing in content of β-phase (Mg2Al3) is distributed and dispersed evenly, contributed to dispersion strengthening of the welded joint. Meanwhile, orientation phenomena is obtained for some grain after deep cryogenic treatment. As a result, the microstructure of the joint can be modified by the deep cryogenic treatment.

Study on Microstructure and Properties of 5A06 Aluminum Alloy Welded Joint by Deep Cryogenic Treatment

2011 ◽  
Vol 314-316 ◽  
pp. 927-931 ◽  
Author(s):  
Shan Gao ◽  
Zhi Sheng Wu ◽  
Peng Fei Jin ◽  
Jun Jie Wang
Keyword(s):  
Aluminum Alloy ◽  
Welded Joints ◽  
Welded Joint ◽  
Cryogenic Treatment ◽  
Liquid Nitrogen Temperature ◽  
X Ray Diffraction ◽  
Deep Cryogenic Treatment ◽  
X Ray ◽  
Before And After ◽  
5A06 Aluminum Alloy

In this paper, some deep cryogenic treatment experiments are first applied to 5A06 aluminum alloy welded joint at liquid nitrogen temperature （-155°C ）for 4h, 8h, 10h respectively. 5A06 alloy welded joints before and after deep cryogenic treatment are observed by X-ray diffraction and scanning electrical microscopy. The experimental results have shown that the deep cryogenic treatment causesβphase of alloy to disperse and makes the grain smaller than that of joint before deep cryogenic treatment. Therefore, the mechanical properties of 5A06 alloy welded joints after deep cryogenic treatment are greatly improved.

Deep Cryogenic Treatment and CrN Coating Effects on Micro-Scale Abrasion of Aluminum Alloy AA 6101-T4

2014 ◽  
Vol 936 ◽  
pp. 1047-1055 ◽  
Author(s):  
Edgar S. Ashiuchi ◽  
Volker F. Steier ◽  
Cosme R.M. Silva ◽  
Tales D. Barbosa ◽  
Tiago F.O. Melo ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Wear Rate ◽  
Cryogenic Treatment ◽  
Deep Cryogenic Treatment ◽  
Low Wear ◽  
The Impact ◽  
Improve Wear Resistance ◽  
Wear Tests

The endurance of components made of aluminum and aluminum alloys is often limited by their low yield strength and by their low wear resistance. The aim of this paper is to investigate the effect of different methods that can improve wear resistance of aluminum alloys. As a first approach, a highly wear resistant chromium nitrite layer was deposited by plasma vapor deposition on the surface of the aluminum alloy AA 6101-T4. In the second method, an ultra-deep cryogenic treatment was selected. Both methods have been previously used to improve the wear resistance of other harder substrate materials, like tool steel. To investigate the impact of the two methods on the wear resistance of such alloy, micro abrasive wear tests were carried out and an analysis based on the Archard’s law was considered. The results showed a decrease of the wear rate by 29% and 26% for the coated and for the cryogenically treated specimens, respectively, when compared to the as received material. The work also investigated the performance of three different methods (Allsopp, Double Intercept and Polynomial AT) usually considered to calculate the wear rate of coated samples. The three methods presented similar measures of wear rate for the substrate and for the coating

scholarly journals Study on Microstructure and Fatigue Damage Mechanism of 6082 Aluminum Alloy T-Type Metal Inert Gas (MIG) Welded Joint

2018 ◽  
Vol 8 (10) ◽  
pp. 1741 ◽  
Author(s):  
Chenfeng Duan ◽  
Shanglei Yang ◽  
Jiaxing Gu ◽  
Qi Xiong ◽  
Yuan Wang
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Fracture ◽  
Molten Pool ◽  
Welded Joint ◽  
Fatigue Cracks ◽  
Weld Line ◽  
Grain Morphology ◽  
Inert Gas ◽  
Fatigue Properties ◽  
6082 Aluminum Alloy

In this experiment, the T-joint of a 6082 aluminum alloy was welded by metal inert gas (MIG) welding and a fatigue test was carried out at room temperature. The mechanisms of generating pores and of fatigue fracture in welded joints are revealed in the case of incomplete penetration. There are two main types of pores: pores that are not welded and pores that are near the upper weld line of the weld. During welding, bubbles in the molten pool are adsorbed on the surface oxide film that is not penetrated, and cannot be floated to form pores; since it is a T-shaped welded joint, the molten pool is overhanged during welding, thereby forming pores near the fusion line. The fatigue strength of the welded joint based on the S–N curve at 107 cycles is estimated to be 37.6 MPa, which can reliably be predicted in engineering applications. Fatigue tests show that fatigue cracks are all generated in the pores of the incomplete penetration, and it and the pores form a long precrack, which leads to large stress concentration, and the fracture occurs under a small applied load. Grain morphology around the pores also has a large effect on the fatigue properties of the T-weld joint. In the weld’s fatigue fracture, it was found that the crack stable-extension zone exhibited ductile-fracture characteristics, and the instantaneous fault zone is composed of a large number of tear-type dimples showing ductile fractures.

Effect of Deep Cryogenic Treatment on the Microstructure of an Aerospace Aluminum Alloy

2012 ◽  
Vol 445 ◽  
pp. 965-970 ◽  
Author(s):  
F. Bouzada ◽  
M. Cabeza ◽  
P. Merino ◽  
S. Trillo
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Residual Stresses ◽  
Grain Boundaries ◽  
Cryogenic Treatment ◽  
Deep Cryogenic Treatment ◽  
Heat Treated ◽  
Static Mechanical ◽  
Compressive Residual Stresses ◽  
Static Mechanical Properties

This paper describes how deep cryogenic treatment at 98K produces changes in the microstructure of a heat-treated aluminum alloy. It was observed how the sub-micrometric particles increased near and at the grain boundaries. This slight precipitation did not produce any modification in static mechanical properties. However, the compressive residual stresses of the material were higher after compared to before the treatment. Both these effects can enhance the life of this alloy through cryogenic treatment.

scholarly journals Fabrication and Mechanical Properties of Tungsten Inert Gas Welding Ring Welded Joint of 7A05-T6/5A06-O Dissimilar Aluminum Alloy

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1156 ◽  
Author(s):  
Wukun Wang ◽  
Zengqiang Cao ◽  
Kai Liu ◽  
Xianglong Zhang ◽  
Kewen Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Welded Joint ◽  
Inert Gas ◽  
Tungsten Inert Gas Welding
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