scholarly journals On Post - Weld Heat Treatment of a Single Crystal Nickel - Based Superalloy Joint by Linear Friction Welding

2015 ◽  
Vol 8 (6) ◽  
pp. 40-43
Author(s):  
T. J. Ma ◽  
◽  
Y. H. Yang ◽  
W. Y. Li ◽  
Y. Zhang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Single Crystal ◽  
Friction Welding ◽  
Post Weld Heat Treatment ◽  
Linear Friction Welding ◽  
Nickel Based Superalloy ◽  
Linear Friction ◽  
Weld Heat

The Effect of Post Weld Heat Treatment on Mechanical Properties of Friction-Welded Alloy 718 and SNCRW Stainless Steel

2007 ◽  
Vol 26-28 ◽  
pp. 511-514 ◽  
Author(s):  
Nam Yong Kim ◽  
Jeoung Han Kim ◽  
Yu Sik Kong ◽  
Jong Won Yoon ◽  
Jong Taek Yeom ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Weld Joint ◽  
Friction Welding ◽  
Rotation Speed ◽  
Post Weld Heat Treatment ◽  
Alloy 718 ◽  
Temperature Range ◽  
Heat Treated ◽  
Weld Heat

The effect of post weld heat treatment on mechanical properties of friction welded Alloy 718 and SNCRW was investigated. Friction welding tests were carried out at a constant rotation speed and pressure. Optimum friction condition was found to be the friction pressure of 25kg/cm2, friction time of 40sec, upset pressure of 80 kg/cm2, and dwell time of 5sec. After friction welding tests, post weld heat treatments were performed in the temperature range of 500-900°C for 8hrs in order to investigate the microstructure and mechanical properties of weld joint. Specimens with the post weld heat treatment at 720°C for 8hrs show optimal mechanical properties. Residual stress of post weld heat treated specimens was measured to weld joint in the same temperature range. After friction welding tests on samples with a diameter of 80mm, tensile properties of post-weld-heat-treated and non-heat-treated samples were compared.

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.

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