What is it about?
In this study, the fracture toughness of a carbon steel (JIS SS400) that has been used for the penstock of a hydroelectric power plant for about 50 years was examined. By measuring the critical crack tip opening displacement in conjunction with analysis for chemical compositions, the characteristics of fracture toughness was investigated
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Why is it important?
1) There is a strong correlation between the content of carbon equivalent, Ceq, and fracture toughness, δc, of the base metal. 2) Weld metal has lower fracture toughness value of δc compared to that of base metal. 3) No correlation exists between the content of impurity elements (phosphorus, P, and sulphide, S) and fracture toughness values of δc. 4) Ceq is not a prospective parameter to estimate the fracture toughness of the weld metal because of the influence of work hardening.
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This page is a summary of: Analysis on Critical CTOD of Long-Term Used Penstock, Key Engineering Materials, June 2017, Trans Tech Publications,
DOI: 10.4028/www.scientific.net/kem.741.57.
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