Weldability, Mechanical Properties and Microstructure of Nickel Based Super Alloys: a review

Abstract

Welding of Nickel Based Super Alloys has been challenging due to the cracking and microstructure segregation of alloying elements. These super alloys are often used in extreme environments like in Turbine Blades, Boilers of Waste incinerators, Seals, Turbocharger rotors, high temperature fasteners, pressure vessels etc. The major application include Aerospace and Automobile Industry. The current paper will cover the relevant published work on welding processes and the challenges that were faced to weld nickel based super alloys. The review will go on to describe the weldability, microstructure and mechanical properties that are produced during and after the welding process. This paper will mainly focus on nickel based super alloys and poses many challenges which need to be focused and solved to produce an operational system in an acceptable time frame.