Research Papers: Materials and Fabrication

Modified Dyson Continuum Damage Model for Austenitic Steel Alloy

[+] Author and Article Information
Seok Jun Kang, Hoomin Lee

School of Mechanical Engineering,
Sungkyunkwan University,
300 Chunchun-dong, Jangan-gu,
Suwon 440-746, Gyeonggi-do, Korea

Jae Boong Choi

School of Mechanical Engineering,
Sungkyunkwan University,
300 Chunchun-dong, Jangan-gu,
Suwon 440-746, Gyeonggi-do, Korea

Moon Ki Kim

School of Mechanical Engineering,
Sungkyunkwan University,
300 Chunchun-dong, Jangan-gu,
Suwon 440-746, Gyeonggi-do, Korea
e-mail: mmkkim@me.skku.ac.kr

1These authors contributed equally to this work.

2Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 25, 2018; final manuscript received March 5, 2018; published online May 21, 2018. Assoc. Editor: Steve J. Hensel.

J. Pressure Vessel Technol 140(4), 041404 (May 21, 2018) (6 pages) Paper No: PVT-18-1030; doi: 10.1115/1.4039883 History: Received January 25, 2018; Revised March 05, 2018

Ultrasuper critical (USC) thermal plants are now in operation around the globe. Their applications include superheaters and reheaters, which generally require high temperature/pressure conditions. To withstand these harsh conditions, an austenitic heat-resistant HR3C (ASME TP310NbN) steel was developed for metal creep resistance. As the designed life time of a typical thermal plant is 150,000 h, it is very important to predict long-term creep behavior. In this study, a three-state variable continuum damage model (CDM) was modified for better estimation of long-term creep life. Accelerated uniaxial creep tests were performed to determine the material parameters. Also, the rupture type and microstructural precipitation were observed by scanning electron microscopy. The creep life of HR3C steel was predicted using only relatively short-term creep test data and was then successfully verified by comparison with the long-term creep data.

Copyright © 2018 by ASME
Topics: Creep , Damage , Stress
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Grahic Jump Location
Fig. 2

Long-term creep life estimation of HR3C with various damage models. The long-term data were reproduced from elsewhere [14].

Grahic Jump Location
Fig. 1

Creep failure strain at different stress states

Grahic Jump Location
Fig. 4

Illustration of SEM observation cut plane. SEM images of uniaxial creep test specimen (291 MPa) at the necking point. (a)–(c) show magnified views of the bottom right image. Cracks along the grain boundary tend to be perpendicular to the loading direction as shown in figure.

Grahic Jump Location
Fig. 3

Scanning electron microscope fractography of HR3C: (a) 329 MPa, (b) 270 MPa, and (c) 236 MPa



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