Abstract
Mechanical and fracture mechanics material properties of 2-1/4Cr-1Mo cast steel were developed at temperatures up to 1000°F (538°C) in support of a fracture mechanics analysis to evaluate the residual life and establish retirement for cause criteria relative to upper inlet Ships Service Turbine Generator (SSTG) casings that contained numerous cracks in the inlet steam passageways and steam chest. Mechanical tests included tensile, Charpy V-notch impact, monotonie and cyclic stress-strain plus static creep rupture tests. Fracture mechanics tests included fracture toughness, load and displacement-controlled fatigue crack growth rate (FCGR) tests and displacement-controlled creep-FCGR interaction tests. Details of the actual fracture mechanics analysis are contained in Part II of this paper.
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