Inferior fatigue resistance of additively-manufactured Ni-based superalloy 718 and its dominating factor

被引：8
|
作者：
Park, Sungcheol [1 ]
Tanaka, Yuya [2 ,3 ]
Okazaki, Saburo [4 ]
Funakoshi, Yusuke [5 ]
Kawashima, Hideto [5 ]
Matsunaga, Hisao [3 ,6 ]
机构：
[1] Kyushu Univ, Grad Sch, 744 Motooka,Nishi Ku, Fukuoka 8190395, Japan
[2] Fukuoka Univ, Dept Mech Engn, 8-19-1 Nanakuma,Jonan Ku, Fukuoka 8140180, Japan
[3] Kyushu Univ, Res Ctr Hydrogen Ind Use & Storage HYDROGENIUS, Fukuoka 8190395, Japan
[4] Kobe Mat Testing Lab Co Ltd, 47-13 Niijima, Harima Cho, Hyogo 6750155, Japan
[5] Japan Aerosp Explorat Agcy JAXA, 2-1-1 Sengen, Tsukuba, Ibaraki 3058505, Japan
[6] Kyushu Univ, Dept Mech Engn, 744 Motooka,Nishi Ku, Fukuoka 8190395, Japan
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 176卷
基金：
日本学术振兴会;
关键词：
Additive manufacturing; Ni-based superalloy; Fatigue limit; Small crack; Fatigue threshold; CRACK-PROPAGATION; BEHAVIOR; MICROSTRUCTURE; PHASES;
D O I：
10.1016/j.ijfatigue.2023.107801
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Push-pull and torsional fatigue tests were conducted using additively-manufactured, Ni-based superalloy 718 samples with various defects and different microstructures, aiming to comprehensively examine fatigue limit determining factors such as detrimental defects and microstructural features. Test results revealed that the fatigue limit in each loading condition was governed by a shear-mode, crack-growth threshold, exhibiting a cracksize dependence similar to that of the wrought alloy. The additively-manufactured materials displayed a substantially reduced crack threshold as compared to wrought ones, potentially attributed to a high volume of low twist angles between neighboring crack-planes.
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页数：12
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