Effect of laser shock peening on the microstructural characterization in weld nugget zone of friction stir welded 7050 aluminum alloys

2018 ◽  
Vol 30 (3) ◽  
pp. 032015
Author(s):  
Peng Liu ◽  
Jiaying Hu ◽  
Siyu Sun ◽  
Shubo Xu ◽  
Guocheng Ren
Keyword(s):  
Aluminum Alloys ◽  
Microstructural Characterization ◽  
Laser Shock Peening ◽  
Weld Nugget ◽  
Laser Shock ◽  
Nugget Zone ◽  
Friction Stir ◽  
Shock Peening

Effect of Laser Shock Peening on micro-structure and mechanical properties of Friction Stir Welded CuCrZr sheets

2021 ◽  
pp. 142238
Author(s):  
Abhijit Sadhu ◽  
Sagar Sarkar ◽  
Angshuman Chattopadhyay ◽  
Omkar Mypati ◽  
Surjya K. Pal ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Micro Structure ◽  
Friction Stir ◽  
Shock Peening

Multi-objective optimization of friction stir welding process parameters for joining of dissimilar AA5083/AA6063 aluminum alloys using hybrid approach

2016 ◽  
Vol 232 (4) ◽  
pp. 343-353 ◽  
Author(s):  
Saurabh Kumar Gupta ◽  
KN Pandey ◽  
Rajneesh Kumar
Keyword(s):  
Friction Stir Welding ◽  
Aluminum Alloys ◽  
Process Parameters ◽  
Hybrid Approach ◽  
Weld Nugget ◽  
Multi Objective Optimization ◽  
Nugget Zone ◽  
Friction Stir ◽  
Multi Objective ◽  
Dissimilar Aluminum Alloys

Joining of dissimilar aluminum alloys are widely used in automobile, aerospace and shipbuilding industries. The defect-free joining of aluminum alloys using conventional technique is a challenging task for a welding engineer. Friction stir welding has been established as one of the most promising processes for defects-free joining of aluminum alloys. In this study, a hybrid approach of grey relational analysis with principal component analysis, is applied for multi-objective optimization of process parameters for friction stir welding of dissimilar AA5083/AA6063 aluminum alloys. Three responses namely tensile strength, average hardness at weld nugget zone and average grain size at weld nugget zone, and four process parameters with three levels have been selected for the study. Taguchi method based L27 orthogonal array design matrix is used for experiments. The optimal set of process parameters using hybrid approach was found as 900 r/min of tool rotational speed, 60 mm/min of welding speed, 18 mm of shoulder diameter and 5 mm of pin diameter. Improved performance of each response was obtained from the confirmation tests at optimum level of parameters.

Wear Resistance and Electrochemical Properties of 6061 Aluminum Alloys Treated by Laser Shock Peening

2018 ◽  
Vol 55 (6) ◽  
pp. 061403
Author(s):  
宁成义 Ning Chengyi ◽  
黄亿辉 Huang Yihui ◽  
张广义 Zhang Guangyi ◽  
张文武 Zhang Wenwu
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloys ◽  
Electrochemical Properties ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening

scholarly journals Corrosion Fatigue Fracture Characteristics of FSW 7075 Aluminum Alloy Joints

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4196
Author(s):  
Qingna Ma ◽  
Fei Shao ◽  
Linyue Bai ◽  
Qian Xu ◽  
Xingkun Xie ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Aluminum Alloys ◽  
Fatigue Fracture ◽  
Corrosion Fatigue ◽  
Weld Nugget ◽  
Fatigue Properties ◽  
Nugget Zone ◽  
Fracture Characteristics ◽  
Friction Stir ◽  
Secondary Cracks

The corrosion fatigue properties and fracture characteristics of friction stir welding joints of 7075 aluminum alloys were studied via corrosion fatigue tests, electrochemical measurements, and corrosion fatigue morphology and microstructure observations. The results show that the corrosion fatigue crack of the friction stir welding (FSW) joint of 7075 aluminum alloys originated in the junction zone between the thermomechanically affected zone and the weld nugget zone. The corrosion fatigue life of the joint decreased with increasing stress amplitude, with an S–N curve equation of lgN = 5.845 − 0.014S. Multiple crack sources were observed in the corrosion fatigue fracture. The main crack source originated from the corrosion pits at the interface between the thermomechanically affected zone and the weld nugget zone due to the influence of the coarse microstructure and the large potential difference between both zones. Corrosion morphologies of a rock candy block and an ant nest appeared in the crack propagation zone and the grain boundary of the weld nugget zone. In addition, fatigue speckles and intergranular fractures were observed, as well as brittle fracture characterized by cleavage steps and secondary cracks in the final fracture zone.

scholarly journals Fatigue Life Extension of AA2024 Specimens and Integral Structures by Laser Shock Peening

2018 ◽  
Vol 165 ◽  
pp. 18001 ◽  
Author(s):  
Nikolai Kashaev ◽  
Sergey Chupakhin ◽  
Volker Ventzke ◽  
Manfred Horstmann ◽  
Stefan Riekehr ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Friction Stir Welding ◽  
Residual Stresses ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Laser Shock Peening ◽  
Specimen Thickness ◽  
Laser Shock ◽  
Friction Stir ◽  
Shock Peening

The goal of the present study is to understand the effects of laser shock peening (LSP)-induced residual stresses on the fatigue crack propagation (FCP) behaviour of the commonly used aircraft aluminium alloy AA2024 in T3 heat treatment condition. LSP treatment was performed using a pulsed Nd:YAG laser on compact tensile C(T)50-specimens with a thickness of 2.0 mm. LSP-treated specimens reveal a significant retardation of the fatigue crack propagation. The fatigue crack retardation effect can be correlated with the compressive residual stresses introduced by LSP throughout the entire specimen thickness. A possible application of the LSP process on a component like panel with three welded stringers representing a part of a fuselage structure was performed as well. The skin-stringer AA2024-AA7050 Tjoints were realised through stationary shoulder friction stir welding (SSFSW), a variant of the conventional friction stir welding process. In this relatively new process, the shoulder does not rotate and therefore does not contribute to the heat generation. Consequently, a reduced and more homogeneous heat input leads to a less affected microstructure and better mechanical properties. The efficiency of the LSP process has been demonstrated resulting in an increase of 200 – 400% in fatigue lifetime.

Effect of laser shock peening on microstructure and hot corrosion of TC11 alloy

2018 ◽  
Vol 335 ◽  
pp. 32-40 ◽  
Author(s):  
Zhaopeng Tong ◽  
Xudong Ren ◽  
Yunpeng Ren ◽  
Fengze Dai ◽  
Yunxia Ye ◽  
...  
Keyword(s):  
Hot Corrosion ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening
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