Linear Friction Welding of a Single Crystal Superalloy

Abstract:

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.

• Periodical: Materials Science Forum (Volumes 706-709)
• Pages: 3022-3027
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.706-709.3022
• Online since: January 2012
• Authors: Priti Wanjara, Elvi Dalgaard, Javad Gholipour, Joel Larose
• Keywords: Linear Friction Welding, Ni Based Superalloy, Single Crystal

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