CORROSION FATIGUE OF TYPE 304 STAINLESS STEEL AND INCONEL 600 IN A BOILING (140 degree C) CONCENTRATED CAUSTIC SOLUTION.

Antwi Boateng, James A. Begley, R. W. Staehle

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Crack growth rate tests using compact tension specimens of Type 304 stainless steel and smooth bar corrosion fatigue tests of Inconel Alloy 600 were run in boiling (140 degree C) 17. 5M NaOH solution. Contrary to earlier results from smooth bar Type 34 specimens, the measured crack growth rates did not show a high accelerative environmental effect; there was also no significant effect of cyclic frequency (0. 1 to 10 Hz), R ratio, or electrochemical potential. For Inconel 600 the boiling caustic solution increased fatigue life relative to life in air, and anodic passivation was beneficial. Sensitization, found beneficial in sodium hydroxide, was detrimental in air in spite of similar failure morphologies. A delay crack initiation is proposed as primarily responsible for the effects of the solution and sensitization.

Original languageEnglish (US)
Pages (from-to)67-73
Number of pages7
JournalMetallurgical transactions. A, Physical metallurgy and materials science
Volume14 A
Issue number1
DOIs
StatePublished - Jan 1 1983

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