scholarly journals Linear friction welding of Ti-6Al-4V alloy fabricated below β-phase transformation temperature

2021 ◽  
Vol 191 ◽  
pp. 12-16
Author(s):  
Jeong-Won Choi ◽  
Yasuhiro Aoki ◽  
Kohsaku Ushioda ◽  
Hidetoshi Fujii
Keyword(s):  
Phase Transformation ◽  
Friction Welding ◽  
Transformation Temperature ◽  
Phase Transformation Temperature ◽  
Linear Friction Welding ◽  
Β Phase ◽  
Linear Friction

Design of Numerical Simulations of Linear Friction Welding Processes: Issues and Difficulties

2015 ◽  
Vol 639 ◽  
pp. 451-458 ◽  
Author(s):  
Antonino Ducato ◽  
Davide Campanella ◽  
Gianluca Buffa ◽  
Livan Fratini
Keyword(s):  
Titanium Alloy ◽  
Phase Transformation ◽  
Friction Welding ◽  
Critical Analysis ◽  
Deformable Objects ◽  
Linear Friction Welding ◽  
Simulation Design ◽  
Advantages And Disadvantages ◽  
Linear Friction ◽  
Welding Processes

In this paper, a critical analysis of the technical difficulties and numerical issues in running simulations of linear friction welding processes is carried out. The focus of the paper is the comparison of different modeling strategies of a numerical analysis for the LFW process of Ti-6Al-4V titanium alloy, for which the thermal aspect strongly influences the mechanical behavior due to the phase transformation, taking place over a definite range of temperature. A 3D simulation campaign, conducted using the FEA code DEFORMTM, was considered in order to show advantages and disadvantages of each approach, including the most critic limitations and complexity in a correct simulation design using two deformable objects.

Characterization of (α+β)/β Transformation in a TC11 Titanium Alloy

2007 ◽  
Vol 127 ◽  
pp. 91-96 ◽  
Author(s):  
Lin Geng ◽  
Bin Xu ◽  
Y.T. Li ◽  
Ai Bin Li ◽  
Gui Song Wang
Keyword(s):  
Titanium Alloy ◽  
Phase Transformation ◽  
Transformation Temperature ◽  
Annealing Treatment ◽  
Phase Transformation Temperature ◽  
Scanning Calorimetry ◽  
Β Phase ◽  
Before And After ◽  
Forming Temperature ◽  
Tc11 Titanium Alloy

(α+β)/β phase transformation temperature of a TC11 titanium alloy was confirmed to be 1035°C, which was obtained by three methods including the calculation method, differential scanning calorimetry and metallographic techniques. Based on this result, annealing treatments below and above the (α+β)/β phase transformation temperature were carried out, and the microstructure of the TC11 alloys before and after annealing treatment was analyzed by SEM. The result showed that conventional annealing below 1035°C does not change the Widmanstaten structure of TC11 alloy, though the thickness of α lamellar structure becomes thicker with increasing the annealing temperature. The microstructure of the TC11 alloy treated by annealing above the α+β/β transformation temperature is non-uniform because of the different forming temperature and growing duration of α phase in the TC11 alloy.

Numerical Simulation and Experiment of Linear Friction Welding Process of Ti6Al4V Alloy

2011 ◽  
Vol 675-677 ◽  
pp. 925-928
Author(s):  
Peng Tao Liu ◽  
Rui Ming Ren ◽  
Tian Cang Zhang ◽  
Dong Ying Ju
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Phase Transformation ◽  
Friction Welding ◽  
Welding Process ◽  
Ti6al4v Alloy ◽  
Temperature Phase ◽  
Linear Friction Welding ◽  
Validation Experiment ◽  
Linear Friction

Using finite element analysis software of COSMAP, a three-dimensional elastic-plastic finite element model of linear friction welding (LFW) process of Ti6Al4V alloy was established. Based on metallo-thermo-mechanical theory relevant to describing the coupled fields of metallic structure, temperature and stress–strain, the temperature fields, phase transformation and stress fields during the LFW process were investigated in numerical simulation. Moreover, the validation experiment was carried out. The results showed that the simulation results of temperature，phase transformation and the residual stress were in good agreement with the experimental ones, which proved the numerical simulation to be reliable.

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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