Correlation between Fracture Morphology and Microstructural Evolution during Long-Term Aging of EK61 Superalloy
Microstructural evolutions of EK61 superalloy during long-term aging until 1000 h at 700°C and 750°C, respectively, are studied by combination of Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM). Impact fracture morphologies after aging for different time are observed by...
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2020-01-01
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Online Access: | http://dx.doi.org/10.1155/2020/1087024 |
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doaj-78dd99d2881e4d179cbd272028803b622020-11-25T02:01:58ZengHindawi-WileyScanning0161-04571932-87452020-01-01202010.1155/2020/10870241087024Correlation between Fracture Morphology and Microstructural Evolution during Long-Term Aging of EK61 SuperalloyJin Huang0Guohua Xu1Heyong Qin2Lei Zheng3School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaHigh-Temperature Materials Department, China Iron & Steel Research Institute Group, Beijing 100081, ChinaHigh-Temperature Materials Department, China Iron & Steel Research Institute Group, Beijing 100081, ChinaSchool of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaMicrostructural evolutions of EK61 superalloy during long-term aging until 1000 h at 700°C and 750°C, respectively, are studied by combination of Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM). Impact fracture morphologies after aging for different time are observed by the SEM. The microstructure is found to be relatively stable during aging at 700°C, and the fracture morphologies are characterized by transgranular fracture. At 750°C, the coarsening of γ′ phase leads the reduction of the quantity of dimples, the chainization of carbides on grain boundaries leads to intergranular fracture, and the netting of η phases within grains leads to the formation of lamellar cleavage steps. It is obvious that the destabilization of precipitated phases affects fracture morphology significantly. The relationship between fracture morphology and the microstructure promotes the evaluation of service reliability of EK61 superalloy.http://dx.doi.org/10.1155/2020/1087024 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jin Huang Guohua Xu Heyong Qin Lei Zheng |
spellingShingle |
Jin Huang Guohua Xu Heyong Qin Lei Zheng Correlation between Fracture Morphology and Microstructural Evolution during Long-Term Aging of EK61 Superalloy Scanning |
author_facet |
Jin Huang Guohua Xu Heyong Qin Lei Zheng |
author_sort |
Jin Huang |
title |
Correlation between Fracture Morphology and Microstructural Evolution during Long-Term Aging of EK61 Superalloy |
title_short |
Correlation between Fracture Morphology and Microstructural Evolution during Long-Term Aging of EK61 Superalloy |
title_full |
Correlation between Fracture Morphology and Microstructural Evolution during Long-Term Aging of EK61 Superalloy |
title_fullStr |
Correlation between Fracture Morphology and Microstructural Evolution during Long-Term Aging of EK61 Superalloy |
title_full_unstemmed |
Correlation between Fracture Morphology and Microstructural Evolution during Long-Term Aging of EK61 Superalloy |
title_sort |
correlation between fracture morphology and microstructural evolution during long-term aging of ek61 superalloy |
publisher |
Hindawi-Wiley |
series |
Scanning |
issn |
0161-0457 1932-8745 |
publishDate |
2020-01-01 |
description |
Microstructural evolutions of EK61 superalloy during long-term aging until 1000 h at 700°C and 750°C, respectively, are studied by combination of Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM). Impact fracture morphologies after aging for different time are observed by the SEM. The microstructure is found to be relatively stable during aging at 700°C, and the fracture morphologies are characterized by transgranular fracture. At 750°C, the coarsening of γ′ phase leads the reduction of the quantity of dimples, the chainization of carbides on grain boundaries leads to intergranular fracture, and the netting of η phases within grains leads to the formation of lamellar cleavage steps. It is obvious that the destabilization of precipitated phases affects fracture morphology significantly. The relationship between fracture morphology and the microstructure promotes the evaluation of service reliability of EK61 superalloy. |
url |
http://dx.doi.org/10.1155/2020/1087024 |
work_keys_str_mv |
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1715595104320749568 |