| Effects of Grain Refinement on the Low-Cycle Fatigue Behavior of IN792 Superalloys | |
| Du, Beining1,2; Sheng, Liyuan1,2; Cui, Chuanyong3; Hu, Ziyang4; Sun, Xiaofeng3 | |
| Corresponding Author | Sheng, Liyuan(lysheng@yeah.net) ; Cui, Chuanyong(chycui@imr.ac.cn) |
| 2021-08-01 | |
| Source Publication | CRYSTALS
 |
| Volume | 11Issue:8Pages:15 |
| Abstract | The Ni-based IN792 superalloy is widely applied as a component in industrial turbines and aircraft engines due to its good high-temperature properties and excellent corrosion resistance. Since these components have to suffer from cyclic thermal and mechanical stresses during service, the high-temperature fatigue failure becomes one of the major factors affecting their service lives. Grain refinement has been considered as an effective way to improve the mechanical performance of superalloys. However, due to the complexity of alloy composition, microstructure and service condition, there is no unified theory about the influence of grain refinement on the fatigue performance and fracture mechanism of superalloys. In the present research, the IN792 superalloy with different grain sizes was manufactured. Then, fully reversed, strain-controlled, low-cycle fatigue (LCF) tests with four different total strain amplitudes were carried out on the alloy at 700 degrees C and 800 degrees C to clarify the effects of grain refinement on its LCF behavior. The results show that grain refinement improved the fatigue life significantly, which is mainly attributed to increasing the grain boundary content and refining MC carbides, eutectic structures and dendritic structures. During fatigue test under lower strain amplitude, the alloy exhibits a pronounced initial fatigue hardening followed by a continuous well-defined stability stage, which is caused by the formation of dislocation networks and coarsening of primary gamma' phases. However, during fatigue test under higher strain amplitude, the alloy exhibits continuous hardening response because the dislocations could shear primary gamma' phases, which could give rise to resistance to dislocation movement. In addition, the fracture surface observation shows that the fatigue fracture mode is mainly affected by the total strain amplitude. Under lower total strain amplitude, the fatigue microcracks mainly initiate at the porosities near the specimen surface, while under higher total strain amplitude, the fatigue microcracks tend to form at the interior of the specimen. |
| Keyword | Ni-based superalloy grain refinement low-cycle fatigue fracture dislocation |
| Funding Organization | National Key Research and Development Program of China ; Natural Science Foundation of Guangdong Province, China ; Shenzhen Basic Research Project ; IER Foundation |
| DOI | 10.3390/cryst11080892 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Key Research and Development Program of China[2018YFC1106702] ; Natural Science Foundation of Guangdong Province, China[2020A1515011301] ; Natural Science Foundation of Guangdong Province, China[2019A1515110067] ; Natural Science Foundation of Guangdong Province, China[2018A0303100018] ; Natural Science Foundation of Guangdong Province, China[2018A030313950] ; Shenzhen Basic Research Project[JCYJ20200109144608205] ; Shenzhen Basic Research Project[JCYJ20170815153143221] ; Shenzhen Basic Research Project[JCYJ20210322085719002] ; IER Foundation[HT-JD-CXY-201902] ; IER Foundation[HT-JD-CXY-201907] |
| WOS Research Area | Crystallography ; Materials Science |
| WOS Subject | Crystallography ; Materials Science, Multidisciplinary |
| WOS ID | WOS:000689009400001 |
| Publisher | MDPI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/166872 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Sheng, Liyuan; Cui, Chuanyong |
| Affiliation | 1.Peking Univ, Shenzhen Inst, Shenzhen 518057, Peoples R China 2.PKU HKUST Shenzhen HonKong Inst, Shenzhen 518057, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 4.Shenzhen Yezhan Elect Co Ltd, Shenzhen 518110, Peoples R China |
| Recommended Citation GB/T 7714 | Du, Beining,Sheng, Liyuan,Cui, Chuanyong,et al. Effects of Grain Refinement on the Low-Cycle Fatigue Behavior of IN792 Superalloys[J]. CRYSTALS,2021,11(8):15. |
| APA | Du, Beining,Sheng, Liyuan,Cui, Chuanyong,Hu, Ziyang,&Sun, Xiaofeng.(2021).Effects of Grain Refinement on the Low-Cycle Fatigue Behavior of IN792 Superalloys.CRYSTALS,11(8),15. |
| MLA | Du, Beining,et al."Effects of Grain Refinement on the Low-Cycle Fatigue Behavior of IN792 Superalloys".CRYSTALS 11.8(2021):15. |
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