Plastic zone sizes in fatigued specimens of INCO 718

TLDR: In this article, an etching technique is described which can be used for Inco 718 and it is suitable to measure the plastic zone sizes in INCO 718, which is currently being used in a study of the fatigue behavior of this alloy.

Abstract: An etching technique is described which can be used for Inco 718. This etching technique is suitable to measure the plastic zone sizes in INCO 718. It is currently being used in a study of the fatigue behavior of this alloy. Since this method is specific to the $gamma$'' $Yields$ $beta$ phase transformation it can also be used for INCO 706 which is also strengthened by $gamma$''. The same principle of post-deformation heat-treatment to delineate plastic zones could be used, for instance, in Fe--Ni--Cr--Ti alloys which exhibit a strain-accelerated $gamma$' $Yields$ eta (DO$sub 24$) transformation. (auth)