Abstract
The effects of long-term aging on mechanical properties of CF3M duplex stainless steel and D308L weld metal were investigated to predict the remaining life of in-service cast components under operating conditions. This paper reports on a tensile test, a fatigue test, fatigue crack growth test, a Charpy impact test, and a JIC toughness test conducted on these materials aged for up to 10000 hours at tempertures form 623 K to 743 K. The effects of aging conditions on mechanical strength of duplex stainless steel and D308L weld metal can be evaluated by considering the aging phenomenon to be a thermally activated process described by an Arrhenius relation.
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