Creep-fatigue life prediction method using Diercks equation for Cr-Mo steel

Keiji Sonoya, Isamu Nonaka, Masaki Kitagawa

Research output: Contribution to journalArticlepeer-review


A method to predict the creep-fatigue life properties of Cr-Mo steels is proposed on the basis of D. Diercks equation which correlates the creep-fatigue lifes of SUS 304 steels under various temperatures, strain ranges, strain rates and hold times. The accuracy of the proposed method was compared with that of the existing methods. Fatigue strength and creep rupture strength of Cr-Mo steel are different from those of SUS 304 steel. In order to apply Diercks equation to creep-fatigue prediction for Cr-Mo steel, the difference of fatigue strength was found to be corrected by fatigue life ratio of both steels and the difference of creep rupture strength was found to be corrected by the equivalent temperature corresponding to equal strength of both steels. Creep-fatigue life can be predicted by the modified Diercks equation within a factor of 2 which is nearly as precise as the accuracy of strain range partitioning method, but required test and analysis are not so complicated.

Original languageEnglish
Pages (from-to)775-782
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Issue number5
Publication statusPublished - 1990

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry


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