High-temperature Fatigue Crack Growth Behavior of 17-4 Ph Stainless Steels
نویسنده
چکیده
The fatigue crack growth (FCG) behavior was investigated for 17-4 PH stainless steels in three heat-treated conditions, i.e., unaged (Condition A), peak-aged (Condition H900), and overaged (Condition H1150), at temperatures ranging from 300 to 500 C. The high-temperature fatigue crack growth rates (FCGRs) of Condition H1150 were increased with an increase in temperature. However, for Conditions A and H900 tested at 500 C, the FCGRs were lower than the lower temperature ones. At 300 and 400 C, H1150 and H900 generally showed the lowest and highest FCGRs, respectively, with Condition A demonstrating behavior between the two. At 500 C, the FCGR curves for all material conditions were merged together. The anomalous FCG behavior of 17-4 PH stainless steels at 500 C was mainly caused by an in-situ precipitate-coarsening effect during test.
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