Abstract
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 °C 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 °C 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 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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This work was funded by the National Science Council of the Republic of China (Taiwan) under Contract Nos. NSC-90-2216-E-008-007 and NSC-91-2216-E-008-007.
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Hsu, KC., Lin, CK. High-temperature fatigue crack growth behavior of 17-4 PH stainless steels. Metall Mater Trans A 35, 3018–3024 (2004). https://doi.org/10.1007/s11661-004-0044-5
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DOI: https://doi.org/10.1007/s11661-004-0044-5