4.7 Article

Fatigue limit of Ni-based superalloy 718 relative to the shear-mode crack-growth threshold: A quantitative evaluation considering the influence of crack-opening and -closing stresses

期刊

INTERNATIONAL JOURNAL OF FATIGUE
卷 148, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106228

关键词

Ni-based superalloy; Shear-mode fatigue cracks; Fatigue thresholds; Torsional loading; High cycle fatigue

资金

  1. JSPS KAKENHI [JP19J10689]

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The fatigue strength of Ni-based superalloy 718 was investigated relative to shear-mode crack-growth thresholds, with precipitation-hardening found to have a negligible impact. It was determined that crack-opening/-closing stresses only imperceptibly alter shear-mode resistance. Based on these findings, a novel strategy for quantifying the alloy's fatigue strength was proposed.
Fatigue strength of Ni-based superalloy 718 was investigated relative to shear-mode crack-growth thresholds, to evaluate the influence of crack-opening/-closing stresses perpendicular to shear-mode crack-planes. The impact of precipitation-hardening was also examined. Using solution-treated and precipitation-hardened materials, three different types of fatigue tests were performed: (i) push?pull; (ii) pure-torsion; (iii) torsion with superposed static tension. All tests revealed non-propagation of small, shear-mode cracks, while confirming the negligible impact of precipitation-hardening on shear-mode crack-growth threshold. Additionally, crack-opening/-closing stresses were determined to only imperceptibly alter shear-mode resistance. Based on these findings, a novel strategy was proposed to quantify the alloy?s fatigue strength.

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