Linear Friction Welding of a Commercial Aluminum Alloy

2016 ◽  
Vol 870 ◽  
pp. 608-613
Author(s):  
F.F. Musin ◽  
A.Y. Medvedev ◽  
B.O. Bolshakov
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Friction Welding ◽  
Solid Phase ◽  
Ingot Metallurgy ◽  
Linear Friction Welding ◽  
Welding Joint ◽  
Microstructure Transformation ◽  
Linear Friction ◽  
Phase Compound

The mechanical properties and microstructure of a solid-phase compound produced by linear friction welding (LFW) of commercial Al-4.4%Cu-0.5%Mg-0.4%Mn-0.5%Ag alloy have been studied. The samples of Al-Cu-Mg-Ag alloy were produced by ingot metallurgy and subjected to thermomechanical treatment to get different initial microstructures. It has been shown that the LFW of two rectangular-shaped samples with different microstructures enabled forming a well-done welding joint without macroscopic defects. The LFW samples have shown high mechanical properties. Strength has reached 452 MPa, and plasticity has become not less 15%. The microstructure transformation in the welding joint during plastic deformation and deformation heating at LFW is discussed.

scholarly journals Study of the Microstructure and Fracture Toughness of TC17 Titanium Alloy Linear Friction Welding Joint

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 430 ◽  
Author(s):  
Xiaohong Li ◽  
Jianchao He ◽  
Yajuan Ji ◽  
Tiancang Zhang ◽  
Yanhua Zhang
Keyword(s):  
Fracture Toughness ◽  
Titanium Alloy ◽  
Friction Welding ◽  
Weld Zone ◽  
Linear Friction Welding ◽  
Welding Joint ◽  
Α Phase ◽  
Significant Difference ◽  
Linear Friction ◽  
The Relationship

In this paper, the fracture toughness of the thermo-mechanically affected zone (TMAZ) and the weld zone (WZ) of the TC17 titanium alloy linear friction welding joint was studied. The relationship between microstructure and fracture toughness of the joint, as well as the morphologies of the joint microstructure and fracture were investigated. The results indicate that after heat treatment, there was no significant difference in hardness between the WZ and the TMAZ of the joint, which was about 420 HV. However, the microstructures of the different zones of the joint were significantly different. The TMAZ was composed of coarse grains having an internal basket-shaped α phase with an uneven grain size, while the WZ was composed of relatively uniform fine grains and contained a sheet-like α phase. The fracture toughness of the TMAZ was found to be higher than that of the WZ, indicating that the microstructure of the joint had a significant impact on the fracture toughness. In addition, the fracture resistance of the TMAZ with coarser grains and uneven microstructure was better than that of the WZ with fine grains and uniform microstructure.

scholarly journals MODELING OF TITANIUM ALLOYS PLASTIC FLOW IN LINEAR FRICTION WELDING

2021 ◽  
Vol 19 (1) ◽  
pp. 091
Author(s):  
Vladimir A. Skripnyak ◽  
Kristina Iokhim ◽  
Evgeniya Skripnyak ◽  
Vladimir V. Skripnyak
Keyword(s):  
Plastic Deformation ◽  
Titanium Alloys ◽  
Plastic Flow ◽  
Friction Welding ◽  
Welded Joint ◽  
High Tech ◽  
Structural Elements ◽  
Linear Friction Welding ◽  
Near Surface ◽  
Linear Friction

The article presents the results of the analysis of the plastic flow of titanium alloys in the process of the Linear Friction Welding (LFW). LFW is a high-tech process for joining critical structural elements of aerospace engineering from light and high-temperature alloys. Experimental studies of LFW modes of such alloys are expensive and technically difficult. Numerical simulation was carried out for understanding the physics of the LFW process and the formation laws of a strong welded joint of titanium alloys. Simulation by the SPH method was performed using the LS DYNA software package (ANSYS WB 15.2) and the developed module for the constitutive equation. The new coupled thermomechanical 3D model of LFW process for joining structural elements from alpha and alpha + beta titanium alloys was proposed. It was shown that the formation of a welded joint occurs in a complex and unsteady stress-strain state. In the near-surface layers of the bodies being welded, titanium alloys can be deformed in the mode of severe plastic deformation. A deviation of the symmetry plane of the plastic deformation zone from the initial position of the contact plane of the bodies being welded occurs during a process of LFW. Extrusion of material from the welded joint zone in the transverse direction with respect to the movement of bodies is caused by a pressure gradient and a decrease in the alloy flow stress due to heating. The hcp-bcc phase transition of titanium alloys upon heating in the LFW process necessitates an increase in the cyclic loading time to obtain a welded joint.

scholarly journals Effect of Heat Treatment on the Microstructure and Properties of a Ti3Al Linear Friction Welding Joint

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1159 ◽  
Author(s):  
Xiaohong Li ◽  
Jianchao He ◽  
Tiancang Zhang ◽  
Jun Tao ◽  
Ju Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Friction Welding ◽  
Weld Zone ◽  
Treatment Temperature ◽  
Linear Friction Welding ◽  
Welding Joint ◽  
Β Phase ◽  
Linear Friction ◽  
Different Temperatures ◽  
Α2 Phase

Heat treatment at different temperatures was carried out on a Ti3Al linear friction welding joint. The characteristics and evolution of the microstructure in the weld zone (WZ) and the thermo-mechanically affected zone (TMAZ) of the Ti3Al LFW joint were analyzed. Combined with the heat treatment after welding, the effect of the heat treatment temperature on the joint was discussed. The test results indicated that the linear friction welding (LFW) process can accomplish a reliable connection between Ti3Al alloys and the joint can avoid defects such as microcracks and voids. The weld zone of the as-welded Ti3Al alloy joint was mainly composed of metastable β phase, while the TMAZ was mainly composed of deformed α2 phase and metastable β phase. After being heat treated at different temperatures, the WZ of the Ti3Al LFW joint exhibited a significantly different microstructure. After heat treatment at 700 °C, dot-like structures precipitated and the joint microhardness increased significantly. Subsequently, the joint microhardness decreases with the increase in temperature. Under heat treatment at temperatures above 850 °C, the formed structure was acicular α2 phase and the joint microhardness after heat treatment was lower than that of the as-welded joint.

scholarly journals Analysis of the Microstructure and Mechanical Properties during Inertia Friction Welding of the Near-α TA19 Titanium Alloy

2020 ◽  
Vol 33 (1) ◽  
Author(s):  
Yanquan Wu ◽  
Chunbo Zhang ◽  
Jun Zhou ◽  
Wu Liang ◽  
Yunlei Li
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
High Temperature ◽  
Base Metal ◽  
Friction Welding ◽  
Welded Joint ◽  
Weld Zone ◽  
Linear Friction Welding ◽  
Β Phase ◽  
Linear Friction

AbstractThe current research of titanium alloy on friction welding process in the field of aero-engines mainly focuses on the linear friction welding. Compared to the linear friction welding, inertial friction welding of titanium alloy still has important application position in the welding of aero-engine rotating assembly. However, up to now, few reports on inertial friction welding of titanium alloy are found. In this paper, the near-alpha TA19 titanium alloy welded joint was successfully obtained by inertial friction welding (IFW) process. The microstructures and mechanical properties were investigated systematically. Results showed that the refined grains within 15‒20 μm and weak texture were found in the weld zone due to dynamic recrystallization caused by high temperature and plastic deformation. The weld zone consisted of acicular α′ martensite phase, αp phase and metastable β phase. Most lath-shaped αs and β phase in base metal were transformed into acicular martensite α′ phase and metastable β phase in thermo-mechanically affected zone and heat affected zone. As a result, the microhardness of welded joint gradually decreased from the weld zone to the base metal. Tensile specimens in room temperature and high temperature of 480 °C were all fractured in base metal illustrating that the inertia friction welded TA19 titanium alloy joint owned higher tensile strength compared to the base metal.

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