Influence of surface integrity induced by multiple machining processes upon the fatigue performance of a nickel based superalloy

Machining operations are of key importance to the fatigue performance nickel based superalloys due high thermal/mechanical loadings yielded on machined workpiece which can significantly alter surface integrity components. Therefore, understanding influence mechanisms machining induced upon response is vital determine their manufacturing processes and applications. In this respect, paper investigates superalloy subject different mechanical thermal by various including conventional (e.g. finish rough milling) nonconventional laser assisted milling abrasive waterjet cutting) methods, as well influences failure mechanisms. In-depth metallurgical crystallographic analysis has been conducted reveal damage mechanisms, allows description alterations workpiece. Furthermore, examination fractography from specimen conducted, enables mechanism corresponding defects crack initiation propagation, a four points bending test. While resulted S-N curves indicate that cycle mainly dominated residual stress conditions, particularly propagation in both low regimes.