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.

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 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.

Experimental characterization of Ti6Al4V T joints welded through linear friction welding technique: microstructure and NDE

2016 ◽  
Vol 4 (4) ◽  
pp. 305-313 ◽  
Author(s):  
Antonello Astarita ◽  
Mario Coppola ◽  
Sergio Esposito ◽  
Mariacira Liberini ◽  
Leandro Maio ◽  
...  
Keyword(s):  
Friction Welding ◽  
Experimental Characterization ◽  
Linear Friction Welding ◽  
T Joints ◽  
Linear Friction ◽  
Welding Technique

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.

Texture Evolution in Linear Friction Welded Ti-6Al-4V

2010 ◽  
Vol 89-91 ◽  
pp. 124-129 ◽  
Author(s):  
E. Dalgaard ◽  
Frederik Coghe ◽  
L. Rabet ◽  
Mohammad Jahazi ◽  
Priti Wanjara ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Texture Evolution ◽  
Parent Material ◽  
Welding Parameters ◽  
Linear Friction Welding ◽  
Electron Backscattered Diffraction ◽  
Strain And Strain Rate ◽  
Linear Friction ◽  
Oscillation Frequencies

The linear friction welding (LFW) behavior of Ti-6Al-4V, a commercial α + β titanium alloy, was investigated using oscillation frequencies ranging from 30-70 Hz and axial pressures from 50-110 MPa. LFW samples were examined using electron backscattered diffraction (EBSD) to relate the texture to the welding parameters and to the estimated strain and strain rate. Characterization of the welds included analysis of the microstructure of the weld and of the thermomechanically affected zones (TMAZ) in relation to the parent 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.

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