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Alloy 182 Models for the Prediction of the Susceptibility to SCC of BMI Nozzle J-welds

Stress Corrosion Cracking (SCC) models are important for engineering and regulatory assessments. The SCC time to the growth of a crack of engineering scale is the main fraction of component life prior to failure and is therefore of significant interest for modeling. However, the stochastic characteristics of early crack development is challenging for model development and validation.

Product Number: ED22-17286-SG
Author: Thierry Couvant
Publication Date: 2022
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$20.00

Empirical and phenomenological models are continuously developed in agreement with engineering needs: understand observed degradations, predict in-service cracking and quantify factors of improvement after mitigation. Complementary to the experimental activity, digital tools are now used to combine available knowledge on materials, manufacturing and operating conditions in order to evaluate Stress Corrosion Cracking (SCC) susceptibility of components. The current paper addresses the case of a bottom mounted instrumentation nozzle where SCC may affect the J-weld metal (Alloy 182).

Empirical and phenomenological models are continuously developed in agreement with engineering needs: understand observed degradations, predict in-service cracking and quantify factors of improvement after mitigation. Complementary to the experimental activity, digital tools are now used to combine available knowledge on materials, manufacturing and operating conditions in order to evaluate Stress Corrosion Cracking (SCC) susceptibility of components. The current paper addresses the case of a bottom mounted instrumentation nozzle where SCC may affect the J-weld metal (Alloy 182).