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Creep lifetime prediction of 9Cr-1Mo (grade T91) steel via small punch creep tests and hierarchical multiscale analysis

Authors
Nguyen, Vinh PhuIbupoto, Fahim AhmedPham, Li QuiChoi, WoosungShin, KeesamKim, Bum JoonKim, Moon KiChoi, Seung Tae
Issue Date
Nov-2020
Publisher
TAYLOR & FRANCIS LTD
Keywords
Crystal elasto-viscoplasticity; finite element analysis; small punch test; T91; creep lifetime; creep cavitation
Citation
MATERIALS AT HIGH TEMPERATURES, v.37, no.6, pp 462 - 477
Pages
16
Journal Title
MATERIALS AT HIGH TEMPERATURES
Volume
37
Number
6
Start Page
462
End Page
477
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/53811
DOI
10.1080/09603409.2020.1824852
ISSN
0960-3409
1878-6413
Abstract
In this study, the creep deformation of ferritic/martensitic 9Cr-1Mo (Grade T91) steel boiler tubes that occurs during the operation of thermal power plants is studied using crystal elasto-viscoplasticity finite element analysis (CEV-FEA). The material properties and creep behaviour of Grade T91 were obtained through experimentation and computational analysis at different scales, e.g., molecular dynamics simulation, scanning electron microscopy, small punch (SP) tests. A triple junction of grains with various combinations of crystallographic orientations of polycrystalline Grade T91 was also simulated by CEV-FEA to investigate the stress concentration evolution during creep deformation. The stress concentration at the triple junction was then used as an input for the creep cavitation model, i.e., as the representative stress driving creep cavitation. The combination of CEV-FEA and SP test experiments can improve the evaluation of creep lifetime for as-received boiler tubes with minimum requirements for the amount of material and testing time.
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공과대학 (기계공학부)
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