The fracture toughness and tensile properties of Alloy 600, Alloy 690 and their welds, EN82H and EN52, were characterized in 54° and 338°C water with an elevated hydrogen content. Results were compared with air data to evaluate the effeet of low and high temperature water on mechanical properties. In addition, the stress corrosion cracking (SCC) behavior of EN82H and EN52 welds was evaluated in 360°C water with high hydrogen. Elastic-plastic JC fracture toughness testing revealed that the fracture resistance of all test materials was exceptionally high in 54° and 338°C air and 338°C water, demonstrating that fracture properties were essentially unaffected by the high temperature water environment. ...
Keywords: Alloy 600, Alloy 690, EN52, EN82H, welds, fracture toughness, stress corrosion cracking, tensile properties, water, hydrogen