Metallurgical and Corrosion Studies of Modified T91 Grade Steel

Document Type

Conference Proceeding


Modified 9Cr-1Mo steels containing different Silicon (Si) content have been tested for evaluation of their metallurgical and corrosion properties. The results of tensile testing indicated reduced failure strain up to 400°C followed by its enhancement at a higher temperature. Stress corrosion cracking tests at constant load did not show any failure in any materials. However, reduced ductility and true failure stress were noted in slow strain rate (SSR) testing, indicating increased cracking susceptibility at elevated temperatures. The corrosion potential became more active with increasing temperature in polarization studies. A combination of intergranular and cleavage failures was observed in specimens tested by the SSR technique.


Chromium-molybdenum steel; Chromium-molybdenum steel – Fatigue; Chromium-molybdenum steel – Stress corrosion; Corrosion; Scanning electron microscopy (SEM); Silicon; Steel alloys; Strains and stresses; Transmission electron microscopy (TEM)


Materials Science and Engineering | Mechanical Engineering | Mechanics of Materials | Metallurgy


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