Failure Investigation of Stainless Steel Adaptor |
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| Authors: | Abhay K Jha K Sreekumar P P Sinha |
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| Affiliation: | 1.Materials Characterisation Division,Vikram Sarabhai Space Centre, Indian Space Research Organisation,Trivandrum,India;2.Materials and Metallurgy Group,Vikram Sarabhai Space Centre, Indian Space Research Organisation,Trivandrum,India;3.Materials and Mechanical Entity,Vikram Sarabhai Space Centre, Indian Space Research Organisation,Trivandrum,India |
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| Abstract: | Adaptors used in check valve inlet pressure sensors were fabricated from austenitic stainless steel. Recently, during pretest operation and during hydrogen pressurization of an engine, a leak was noticed through the adaptor. Subsequent to disassembly, the leak was attributed to a crack in the adaptor. Detailed metallurgical investigations were carried out to understand the cause of cracking. Synergistic effect of chloride ions present in marine environment, the presence of residual stresses and sensitized grains of the material led to intergranular stress corrosion cracking. This article highlights details of investigation. |
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