TY - JOUR
T1 - Fatigue limit of Ni-based superalloy 718 relative to the shear-mode crack-growth threshold
T2 - A quantitative evaluation considering the influence of crack-opening and -closing stresses
AU - Tanaka, Yuya
AU - Okazaki, Saburo
AU - Ogawa, Yuhei
AU - Endo, Masahiro
AU - Matsunaga, Hisao
N1 - Funding Information:
This study was partially supported by JSPS KAKENHI (Grant Number JP19J10689).
Publisher Copyright:
© 2021 The Authors
PY - 2021/7
Y1 - 2021/7
N2 - 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.
AB - 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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U2 - 10.1016/j.ijfatigue.2021.106228
DO - 10.1016/j.ijfatigue.2021.106228
M3 - Article
AN - SCOPUS:85103633473
SN - 0142-1123
VL - 148
JO - International Journal of Fatigue
JF - International Journal of Fatigue
M1 - 106228
ER -