Effect of strain rate on high-temperature low-cycle fatigue of 17-4 PH stainless steels

Jui Hung Wu, Chih Kuang Lin

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The effect of strain rate (10-2, 10-3 and 10-4 s-1) on the low-cycle fatigue (LCF) behavior was investigated for 17-4 PH stainless steels in three different conditions at temperatures of 300-500 °C. The cyclic stress response (CSR) for Condition A tested at 300 and 400 °C showed cyclic hardening due to an influence of dynamic strain aging (DSA). An in situ precipitation-hardening effect was found to be partially responsible for the cyclic hardening in Condition A at 400 °C. For H900 and H1150 conditions tested at 300 and 400 °C, the CSR exhibited a stable stress level before a fast drop in load indicating no cyclic hardening or softening. At 500 °C, cyclic softening was observed for all given material conditions because of a thermal dislocation recovery mechanism. The cyclic softening behavior in Conditions A and H900 tested at 500 °C is attributed partially to coarsening of the Cu-rich precipitates. The LCF life for each material condition, tested at a given temperature, decreased with decreasing strain rate as a result of an enhanced DSA effect. At all given testing conditions, transgranular cracking was the common fatigue fracture mode.

Original languageEnglish
Pages (from-to)291-298
Number of pages8
JournalMaterials Science and Engineering A
Issue number1-2
StatePublished - 15 Jan 2005


  • 17-4 PH stainless steel
  • Dynamic strain aging
  • High temperatures
  • Low-cycle fatigue


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