A calibration procedure for the assessment of work hardening Part II: Application to shot peened IN718 parts

The objective of this paper is to discuss the application calibration methodology exposed in previous part shot-peened Inconel 718 specimens. Shot peening commonly used increase fatigue life critical parts such as turbine discs. This surface treatment induces residual stresses, work hardening and possibly, gradients microstructures that, turn, affect life. Work a quantity that represents set physical mechanical phenomena related level disorder reached microstructure material. seldom taken into account assessment mainly because it not possible characterize directly. We propose use (see I [1]) on samples shot peened with several conditions. three complementary experimental techniques (microhardness, XRD EBSD) are then determine through correlation curves gradients. for characterizing within specimens first presented. A discussion applicability method context provided. results obtained different characterization methods microstructural effects analyzed two sections. Finally, influence conditions stresses discussed, showing interest proposed procedure obtain real picture state after peening.