Smart assessment of environment assisted cracking of grade 92 material using different test solutions

Abstract

The Environment Assisted Cracking (EAC) of grade P92 was investigated by employing a new testing method. The main aim is to understand the mechanism of the EAC. The specimen was subjected to a static load of approximately 90% of the material's yield strength. The experimental work was carried out under the various corrosive environments such as NaOH, KOH, HCl, CuSO4, and CH4N2S test solutions until it gets fractured, which takes a duration of one week (168 h). These specimens were subjected to the Scanning Electron Microscope (SEM) analysis for obtaining its microstructural characterization. Further, the obtained microstructural images can be utilized to understand the failure mechanism. It can be witnessed that the majority of failures appear in the region around the coarse-grained HAZ. Subsequently, the results indicate that the passive path corrosion mechanism seems to be the preferred one as P92 welds are vulnerable to EAC.