scholarly journals Springback Prediction of Friction Stir Welded DP590 Steel Sheet Considering Permanent Softening Behavior

2009 ◽  
Vol 18 (4) ◽  
pp. 329-335
Keyword(s):  
Steel Sheet ◽  
Friction Stir ◽  
Softening Behavior ◽  
Springback Prediction ◽  
Permanent Softening

Formation and Structure of Work Material in the Friction Stir Forming Process

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Sladjan Lazarevic ◽  
Kenneth A. Ogata ◽  
Scott F. Miller ◽  
Grant H. Kruger ◽  
Blair E. Carlson
Keyword(s):  
Steel Sheet ◽  
Dissimilar Materials ◽  
Mechanical Interlocking ◽  
Forming Process ◽  
Friction Stir ◽  
Joint Structure ◽  
Work Material ◽  
Formation Zone ◽  
Significant Process ◽  
Geometrical Effects

Friction stir forming (FSF) is a new environmentally friendly manufacturing process for lap joining of dissimilar materials. Fundamentally, this process is based on frictionally heating and mechanically stirring work material of the top piece in a plasticized state to form a mechanical interlocking joint within the bottom material. In this research, the significant process parameters were identified and optimized for Al 6014 alloy and mild steel using a design of experiments (DOE) methodology. The overall joint structure and grain microstructure were mapped as the FSF process progressed and the aluminum work material deformed through different stages. It was found that the work material within the joint exhibited two layers, thermomechanical affected zone, which formed due to the contact pressure and angular momentum of the tool, and heat affected formation zone, which was composed of work material formed through the hole in the steel sheet and into the anvil cavity. Two different geometries of anvil design were employed to investigate geometrical effects during FSF of the aluminum. It was found that the direction and amount of work material deformation under the tool varies from the center to the shoulder.

Mechanical Interlocking of Titanium and Steel Using Friction Stir Forming

2018 ◽  
Vol 792 ◽  
pp. 59-64
Author(s):  
Hamed Mofidi Tabatabaei ◽  
Shun Orihara ◽  
Tadashi Nishihara ◽  
Takahiro Ohashi
Keyword(s):  
Steel Sheet ◽  
Pure Titanium ◽  
Mechanical Interlocking ◽  
Titanium Plate ◽  
Screw Hole ◽  
Microstructural Observation ◽  
Friction Stir ◽  
Hardness Tests ◽  
Dissimilar Alloys ◽  
Novel Method

This study presents a novel method for mechanically interlocking dissimilar alloys of pure titanium with steel through using the principles of friction stir forming (FSF) technique. In present study, titanium plate is placed on top of a steel sheet containing a screwed hole. FSF is conducted on top of the titanium alloy, which produces sufficient heat to plasticize the alloy. This results in a flow of titanium into the screw hole in the steel, due to the plastic deformation, thereby mechanically interlocking titanium with the steel. The mechanical properties of the developed interlock are investigated through tensile and hardness tests and microstructural observation.

Effect of Transformation on Springback for TRIP Steel Stamping

2011 ◽  
Vol 221 ◽  
pp. 405-410 ◽  
Author(s):  
Li Liu ◽  
Ti Kun Shan
Keyword(s):  
Martensitic Transformation ◽  
Young’S Modulus ◽  
Trip Steel ◽  
Steel Sheet ◽  
Young's Modulus ◽  
Sheet Steel ◽  
Transformation Kinetics ◽  
Sheet Stamping ◽  
Trip Steel Sheet ◽  
Springback Prediction

A relation between the Young’s modulus and the martensitic transformation during TRIP sheet steel stamping is investigated. A TRIP steel, TRIP600, is used to study the phenomenon. The transformation kinetics under different loading paths were gotten through simple-shear, uniaxial tension, plane strain and equibiaxial stretching tests. The Young’s modulus, which plays an important role in accurate springback prediction for TRIP steel sheet stamping, is changed with the martensitic transformation during TRIP steel deformation. To improve the accuracy of springback simulation, the constitutive model of the TRIP steel is developed considering the variation of the Young’s modulus with the martensitic transformation. The accuracy of the proposed method is verified by the experimental results.

Nondestructive Evaluation of Friction Stir-Welded Aluminum Alloy to Coated Steel Sheet Lap Joint

2015 ◽  
Vol 24 (11) ◽  
pp. 4192-4199 ◽  
Author(s):  
H. Das ◽  
A. Kumar ◽  
K. V. Rajkumar ◽  
T. Saravanan ◽  
T. Jayakumar ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Nondestructive Evaluation ◽  
Steel Sheet ◽  
Coated Steel ◽  
Lap Joint ◽  
Friction Stir ◽  
Coated Steel Sheet

Development of friction stir welding of high strength steel sheet

2011 ◽  
Vol 16 (2) ◽  
pp. 181-187 ◽  
Author(s):  
M. Matsushita ◽  
Y. Kitani ◽  
R. Ikeda ◽  
M. Ono ◽  
H. Fujii ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Friction Stir

Joint Interface Morphology of Friction Stir Spot Welded Aluminum Alloy Sheets and Plated Steel Sheets

2010 ◽  
Vol 654-656 ◽  
pp. 970-973 ◽  
Author(s):  
Keyan Feng ◽  
Mitsuhiro Watanabe ◽  
Shinji Kumai
Keyword(s):  
Aluminum Alloy ◽  
Melting Temperature ◽  
Steel Sheet ◽  
Alloy Sheet ◽  
Zinc Alloy ◽  
Joint Interface ◽  
Aluminum Alloy Sheet ◽  
Pure Zinc ◽  
Friction Stir ◽  
Steel Sheets

Friction stir spot welding (FSSW) was applied to lap joining of aluminum alloy sheets and steel sheets. A 1.2 mm-thick non-plated carbon steel sheet and plated steel sheets with zinc alloy (ZAM), pure zinc (GI), zinc alloy including Fe (GA) and Al-Si alloy (AS) were prepared. The melting temperature of the plated layer is 330, 420, 880 and 640°C, respectively. A 1.1 mm-thick 6022 aluminum alloy sheet was overlapped on the steel sheet. A rotating tool was inserted from the aluminum alloy sheet side and the probe tip was kept at the position of 0.2 mm above the lapped interface for 3 seconds. For ZAM and GI, original plated layers were removed from the interface and intermediate layers were formed at the joint interface. This is because the melting temperature of the plated layer was lower than the interface temperature under the rotating probe tip during the FSSW. In contrast to that, the partial original plated layer remained after welding, and additional layer formed at the plated layer /aluminum alloy interface for GA. For AS, Al-Fe intermetallic compound layer, which was formed at the original Al-Si alloy plated steel surface remained.

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