The stress corrosion cracking (SCC) susceptibilities of Alloy 22 and Type 316L stainless steel were evaluated in concentrated chloride solutions. Test results indicate that Alloy 22 is very resistant to chloride SCC. No SCC was observed after 12 months in 14.0 molal Cl− as MgCl2 at 110 °C using fatigue precracked wedge opening loaded double cantilever beam specimens with an initial stress intensity of 32.7 MPa∙m1/2; however, minor grain boundary attack and limited secondary cracking were observed. Similar results were obtained in tests conducted in 9.1 molal LiCl at 95 °C using compact tension specimens at a stress intensity of 47 MPa∙m1/2 with and without cyclic loading. The SCC susceptibility of Type 316L SS was sharply reduced in similar chloride solutions when the potential of the material was reduced below the repassivation potential for crevice corrosion.

Subject
Openings, Test methods, Stress intensity, Nickel based alloys, Compliance, Crack initiation, Crack propagation, Stress cracking, Electric potential, Stainless steel, Fatigue, Stress corrosion cracking, Chloride stress corrosion cracking
Keywords:
Stress corrosion cracking, localized corrosion, stainless steel, nickel base alloys, nuclear waste disposal
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2002
GOV
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