Role of grain boundaries and precipitates in small, fatigue crack-growth resistance of additively-manufactured, Ni-based superalloy 718 under torsional cyclic loading

被引：5
|
作者：
Park, Sungcheol [1 ]
Tanaka, Yuya [2 ]
Okazaki, Saburo [3 ]
Funakoshi, Yusuke [4 ]
Kawashima, Hideto [4 ]
Matsunaga, Hisao [5 ]
机构：
[1] Kyushu Univ, Grad Sch Engn, 744 Motooka,Nishi Ku, Fukuoka 8190395, Japan
[2] Fukuoka Univ, Dept Mech Engn, 8-19-1 Nanakuma,Jonan Ku, Fukuoka 8140180, Japan
[3] Kobe Mat Testing Lab Co Ltd, 47-13 Niijima, Harima, Hyogo 6750155, Japan
[4] Japan Aerosp Explorat Agcy JAXA, 2-1-1 Sengen, Tsukuba, Ibaraki 3058505, Japan
[5] Kyushu Univ, Dept Mech Engn, 744 Motooka,Nishi Ku, Fukuoka 8190395, Japan
来源：
MATERIALS LETTERS | 2023年 / 350卷
基金：
日本学术振兴会;
关键词：
Additive manufacturing; Ni-based superalloy; Torsional fatigue; Small crack; Fatigue resistance; PROPAGATION; BEHAVIOR;
D O I：
10.1016/j.matlet.2023.134844
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In essence, additively-manufactured, Ni-based superalloy 718 (AM Alloy 718) possesses a strong crystallographic texture, 6-phases and Laves phases, whose effect on fatigue resistance under torsional cyclic loading is yet to be investigated. In order to elucidate the role of microstructural features in small-crack behavior, torsional fatigue testing was conducted on an AM Alloy 718. Test results revealed that crack-growth was controlled by the twist angle, but also by the tilt angle which had been reported to play a minor role in fatigue resistance under uniaxial cyclic loading. Furthermore, the impact of precipitates appeared to be insignificant, with no strong correlation made between their dispersion and the crack-growth rate.
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页数：4
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