Grain Boundary Segregation and Environmental Degradation of a Ferritic Stainless Steel

摘要

Grain boundary segregation analysis, hydrogen embrittlement and stress corrosion tests were conducted on a 13 mm thick plate of the Fusion AOD heat (No. 9607) of HT-9. Grain boundary chemical analysis was performed using PHI model 595 and 545 Auger Electron Spectrometers (AES). The Model 595 spectrometer has a spatial resolution of less than 0.1 mu m which allows segregation to measured on very small segments of grain boundary or other microstructural features. Analysis was performed on material given the following heat treatments: 1) 1040 exp 0 C for 30 min, air-cooled + 760 exp 0 C for 2-1/2 hr, air-cooled; 2) same as 1 + 240 hr at 500 exp 0 C. (ERA citation 08:051653)