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.

Linear Friction Welding of a Forged Near-α Titanium Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 211-216 ◽  
Author(s):  
E. Dalgaard ◽  
Priti Wanjara ◽  
Javad Gholipour ◽  
John J. Jonas
Keyword(s):  
Titanium Alloy ◽  
Friction Welding ◽  
Creep Resistance ◽  
Electron Backscatter Diffraction ◽  
Weld Zone ◽  
Base Material ◽  
High Tech ◽  
Linear Friction Welding ◽  
Linear Friction ◽  
Backscatter Diffraction

IMI834 (Ti-5.8Al-4Sn-3.5Zr-0.7Nb-0.5Mo-0.35Si) is a high-tech near-α titanium alloy with improved creep resistance and mechanical property retention at temperatures up to 600°C [1]. It is used in the aerospace industry for compressor disks and blades due to its excellent balance between creep resistance and fatigue strength [2]. The linear friction welding (LFW) behaviour of IMI834 displaying an initial bimodal α+β microstructure was investigated using varying axial pressures during welding. Electron backscatter diffraction (EBSD) was used to characterize the texture and phase fraction of the welded IMI834 samples in the weld zone (WZ) and thermomechanically affected zones (TMAZ) in relation to the base material. Based on microhardness evaluation of the weldments, the WZ was determined to be slightly harder than the base material.

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.

Effect of Process Parameters on Welding Variables during Linear Friction Welding of Ti-6Al-4V Alloy

2011 ◽  
Vol 314-316 ◽  
pp. 979-983
Author(s):  
Tie Jun Ma ◽  
Xi Chen ◽  
Wen Ya Li
Keyword(s):  
Titanium Alloy ◽  
Process Parameters ◽  
Friction Welding ◽  
Welding Process ◽  
Orthogonal Experimental Design ◽  
Linear Friction Welding ◽  
Influence Of Process Parameters ◽  
Linear Friction ◽  
Suitable Process ◽  
Axial Shortening

The orthogonal experimental design was conducted for linear friction welding of Ti-6Al-4V titanium alloy (TC4). The friction power and joint temperature were collected during the welding process. The influence of process parameters on the axial shortening was analyzed. The suitable process parameters were determined by investigating the joint appearance, the requirement of axial shortening and welding variables during welding. The results provide important reference for establishing process parameters of linear friction welding in practice.

Linear friction welding of a near-β titanium alloy

2012 ◽  
Vol 60 (2) ◽  
pp. 770-780 ◽  
Author(s):  
E. Dalgaard ◽  
P. Wanjara ◽  
J. Gholipour ◽  
X. Cao ◽  
J.J. Jonas
Keyword(s):  
Titanium Alloy ◽  
Friction Welding ◽  
Linear Friction Welding ◽  
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.

Linear Friction Welding of a Single Crystal Superalloy

2012 ◽  
Vol 706-709 ◽  
pp. 3022-3027 ◽  
Author(s):  
Priti Wanjara ◽  
Elvi Dalgaard ◽  
Javad Gholipour ◽  
Joel Larose
Keyword(s):  
Single Crystal ◽  
Friction Welding ◽  
Weld Zone ◽  
Parent Material ◽  
Linear Friction Welding ◽  
Microhardness Testing ◽  
Linear Friction ◽  
Optical Examination ◽  
Microstructural Examination

The effect of forging pressure on linear friction welding (LFW) behaviour of a single crystal Ni-based superalloy was investigated. Crystal orientations of the specimens were controlled and results indicated that welding success is dependent on proximity of the oscillation direction to the <011> direction. Characterization of the welds included optical examination of the microstructural features of the weld and thermomechanically affected zones (TMAZ) in relation to the parent material. Mechanical properties of the welded material examined via microhardness testing showed an increase in strength in the weld zone (WZ). Microstructural examination indicated that some recrystallization occurred in the WZ, as well as a small amount of distortion of the dendrites in the TMAZ. With increased forge pressure, recrystallized grains remaining in the weld were minimized.

Numerical Simulation of Temperature Field of Linear Friction Welding of Titanium Alloy

2013 ◽  
Vol 328 ◽  
pp. 981-984
Author(s):  
Z.M. Liu ◽  
J. Wang ◽  
J.L. Pan
Keyword(s):  
Titanium Alloy ◽  
Temperature Field ◽  
Material Properties ◽  
Friction Welding ◽  
Contact Boundary ◽  
Linear Friction Welding ◽  
Stable Temperature ◽  
Linear Friction ◽  
Key Techniques ◽  
Finite Elements Model

In this paper, A 3D finite-elements model of titanium alloy TC4 of linear friction welding is developed based on the solution of several key techniques, such as contact boundary condition treating, material properties definition, meshing technology, etc. The temperature field and the temperature gradient of workpiece are showed in results. The temperature at the interface was quickly increased to near 1000°C at 1s, and then reached a quasi-steady and the stable temperature of interface maintained about 1100°C until welding finished.

scholarly journals Joining of Dissimilar Alloys Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo-0.1Si Using Linear Friction Welding

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3664 ◽  
Author(s):  
Sidharth Rajan ◽  
Priti Wanjara ◽  
Javad Gholipour ◽  
Abu Syed Kabir
Keyword(s):  
Friction Welding ◽  
Weld Zone ◽  
Stress Relief ◽  
Valuable Insight ◽  
Linear Friction Welding ◽  
Dissimilar Joints ◽  
Dissimilar Welds ◽  
Dissimilar Alloys ◽  
Linear Friction ◽  
Static Tensile

Dissimilar joints between Ti-6Al-4V (Ti-64) and Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti-6242) were manufactured using linear friction welding. The weld quality, in terms of the microstructure and mechanical properties, was investigated after stress relief annealing (SRA) at 750 °C for 2 h and compared with the as-welded (AWed) results. The central weld zone (CWZ) microstructure in the AWed condition consisted of recrystallized prior-β grains with α’ martensite, which transformed into an acicular α+β structure after SRA. The hardness in the AWed condition was highest in the CWZ and decreased sharply through the thermomechanically affected zones (TMAZ) to the parent materials (PMs). After SRA, the hardness of the CWZ decreased, mainly due to tempering of the α’ martensite microstructure. Static tensile testing of the dissimilar welds in both the AWed and stress relief annealed (SRAed) conditions resulted in ductile fracture occurring exclusively in the Ti-6Al-4V side of the joint. The promising results on joining of Ti-64 to Ti-6242 provide valuable insight for tailoring performance of next-generation aero-engine products.

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