Effect of porosity and eutectics on the high-temperature low-cycle fatigue performance of a nickel-base single-crystal superalloy

被引：63
|
作者：
Ruttert, Benjamin [1 ]
Meid, Carla [2 ]
Mujica Roncery, Lais [1 ,3 ,4 ]
Lopez-Galilea, Inmaculada [1 ]
Bartsch, Marion [2 ]
Theisen, Werner [1 ]
机构：
[1] Ruhr Univ Bochum, Inst Werkstoffe, Lehrstuhl Werkstofftech, Bochum, Germany
[2] Deutsch Zentrum Luft & Raumfahrt, Inst Werkstoff Forsch, Cologne, Germany
[3] Univ Pedag & Tecnol Colombia, Grp Invest Mat Siderurg, Boyaca, Colombia
[4] Univ Pedag & Tecnol Colombia, INCITEMA, Boyaca, Colombia
来源：
SCRIPTA MATERIALIA | 2018年 / 155卷
关键词：
Electron backscatter diffraction (EBSD); Hot isostatic pressing (HIP); Low-cycle fatigue; Microstructure; Single-crystal superalloy; SOLUTION HEAT-TREATMENT; LOW-STRESS CREEP; MECHANICAL-PROPERTIES; MICROSTRUCTURE; DEFORMATION; BEHAVIOR; CMSX-4; DAMAGE;
D O I：
10.1016/j.scriptamat.2018.06.036
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This work investigates the separate influence of porosity and gamma/gamma'-eutectics on the low-cycle fatigue life of a single-crystal Ni-base superalloy at high temperatures. A conventional vacuum furnace heat-treatment but also integrated heat-treatments in a hot isostatic press are applied to produce different material variants of the same alloy. High-resolution electron microscopy revealed that both pores and gamma/gamma'-eutectics act as crack starters, thus initiating early failure. Moreover, the results indicate that remaining gamma/gamma'-eutectics can weaken the fatigue resistance even more than pores. Furthermore, the results confirm the beneficial effect of proper integrated hot isostatic pressing heat-treatments on the fatigue performance. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd.
引用
收藏
页码：139 / 143
页数：5
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