Criteria for determining the fatigue limit of Ni-based superalloy 718, considering the competition between opening- and shear-mode fatigue crack-growth

被引：3
|
作者：
Tanaka, Yuya [1 ,2 ,3 ]
Park, Sungcheol [4 ]
Okazaki, Saburo [5 ]
Matsunaga, Hisao [2 ,6 ]
机构：
[1] Fukuoka Univ, Dept Mech Engn, 8-19-1 Nanakuma,Jonan Ku, Fukuoka 8140180, Japan
[2] Kyushu Univ, Res Ctr Hydrogen Ind Use & Storage HYDROGENIUS, 744 Motooka,Nishi Ku, Fukuoka 8190395, Japan
[3] Fukuoka Univ, Inst Mat Sci & Technol, 8-19-1 Nanakuma,Jonan Ku, Fukuoka 8140180, Japan
[4] Kyushu Univ, Grad Sch Engn, 744 Motooka,Nishi Ku, Fukuoka 8190395, Japan
[5] Kobe Mat Testing Lab Co Ltd, 47-13 Niijima, Harima, Hyogo 6750155, Japan
[6] Kyushu Univ, Dept Mech Engn, 744 Motooka,Nishi Ku, Fukuoka 8190395, Japan
来源：
ENGINEERING FRACTURE MECHANICS | 2023年 / 290卷
基金：
日本学术振兴会;
关键词：
Ni-based superalloy; Fatigue crack-growth threshold; Driving force; Opening-mode crack; Shear-mode crack; THRESHOLD; PROPAGATION; BEHAVIOR; CLOSURE; STEEL;
D O I：
10.1016/j.engfracmech.2023.109500
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The mechanism that determines the fatigue limit associated with small-crack arrest in Ni-based superalloy 718 remains under debate. In order to comprehensively assess the alloy's fatigue limit in relation to the growth threshold of a small fatigue crack, (i) a & UDelta;KI-decreasing fatigue crack-growth test, (ii) torsional fatigue tests and (iii) tension-compression fatigue tests were conducted under fully-reversed loading conditions. In addition, elastic, crack-tip stress fields were analyzed for cracks under various loading conditions. Based on the results, a novel strategy for evaluating the alloy's fatigue limit is proposed after consideration of two crack-arresting modes (i. e., opening and shear modes).
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页数：19
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