EFFECT OF STEAM IMPURITIES ON CORROSION FATIGUE CRACK GROWTH RATES OF A TURBINE DISC STEEL.

R. Rungta, J. A. Begley, R. W. Staehle

Research output: Contribution to specialist publicationArticle

5 Scopus citations

Abstract

Corrosion fatigue crack growth studies have been conducted on a Ni-Cr-Mo-V turbine disc steel in saturated sodium chloride and sodium sulfate environments at 100 C. The results show that crack growth rate is accelerated in both environments at open circuit potential compared to the rate in air environment. Crack growth rate is further accelerated in both environments with the application of a large cathodic potential. It is suggested that the material cracks by two mechanisms: hydrogen embrittlement at very cathodic potentials, and film rupture and anodic dissolution at relatively noble potentials around the open circuit potential. Comparison of the results with those for concentrated sodium hydroxide (100 C) and double distilled water (97 C) shows that although sodium hydroxide (which is another impurity present in the steam) is the most aggressive specie, distilled water inhances cracking as well.

Original languageEnglish (US)
Pages682-690
Number of pages9
Volume37
No12
Specialist publicationCorrosion
DOIs
StatePublished - 1981

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