The resistance of Inconel(1) alloy 600 to stress corrosion cracking in sodium hydroxide was correlated with carbon content, heat treatment, microstructure, and corrosion rate in nitric acid. Tubing samples having carbon contents of 0.02 to 0.05% were evaluated in deaerated 10% NaOH at 288 C (550 F) using a quantitative slow strain rate test. Three material conditions were used: cold drawn plus annealed (CDA), CDA plus 593 C (1100 F)/4 hours, and CDA plus 704 C (1300 F)/15 hours. Results showed that material in the latter two conditions had significantly improved resistance to cracking over the CDA material. Cracking resistance of the CDA material increased with carbon content. The presence or absence of intergranular sensitization or intragranular carbide precipitation had no effect on cracking resistance.

Subject
Materials, Carbides, Intergranular stress corrosion cracking, Precipitation (solids), Microstructure, Nickel based alloys, Intergranular cracking, Elongation, Heat, Carbon, Caustic stress corrosion cracking, Alloys, Heat treatment
National Association of Corrosion Engineers
1982
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