Dept. of Materials Science and Engineering
Oregon Graduate Center
Stainless steel castings of the type CF-3M, CG-8M and CF-3C were studied to determine the effect of exposure at 316, 427 and 594Â°C (600, 800 and 1100Â°F) for the durations up to 14,000 hrs. Substantial reduction in the room temperature CVN impact toughness resulted after aging these castings. Also, hardness and microhardness values increased with aging time. The ferrite contents of castings decreased with increasing aging time at 594 and 427Â°C (1100 and 800Â°F), but the ferrite content increased after aging at 316Â°C (600Â°F). The weldability of these castings (as measured by the varestraint test) was found to be excellent. No significant change in the weldability and hot cracking susceptibility was found as a result of aging the castings at 594 and 427Â°C (1100 and 800Â°F) up to 10,000 hours. Only after the ferrite content exceeded about 22 FN did a noticeable increase in the hot cracking tendency occur. Higher sulphur contents gave rise to greater hot cracking tendency of the weld
Shendye, Sanjay B., "Effect of long term elevated temperature exposure on the mechanical properties and weldability of cast duplex stainless steels" (1985). Scholar Archive. 212.