Biaxial thermal creep of alloy 617 and alloy 230 for vhtr applications

Kun Mo, Di Yun, Wei Lv, Yinbin Miao, Hsiao Ming Tung, James F. Stubbins

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, we employed pressurized creep tubes to investigate the biaxial thermal creep behavior of Inconel 617 (Alloy 617) and Haynes 230 (Alloy 230). Both alloys have been considered to be the primary candidate structural materials for very high temperature reactors (VHTRs) due to their exceptional high-temperature mechanical properties. The current creep experiments were conducted at 900ºC for the effective stress range of 15-35 MPa. For both alloys, complete creep strain development with primary, secondary, and tertiary regimes were observed in all studied conditions. The tertiary creep was found to be dominant in the entire creep lives of both alloys. With increasing applied creep stress, the fraction of the secondary creep regime decreases. The nucleation, diffusion, and coarsening of creep voids and carbides on grain boundaries was found to be the main reason for the limited secondary regime, and was also found to be the major cause of creep fracture. The creep curves computed using the adjusted creep equation of the form A cosh1(1 rt) P ntm agree well with the experimental results for both alloys at the temperatures of 850-950ºC.

Original languageEnglish (US)
Title of host publicationASME 2014 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries, ETAM 2014
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791840740
DOIs
StatePublished - Jan 1 2017
EventASME 2014 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries, ETAM 2014 - Seattle, United States
Duration: Mar 25 2014Mar 27 2014

Publication series

NameASME 2014 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries, ETAM 2014

Other

OtherASME 2014 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries, ETAM 2014
CountryUnited States
CitySeattle
Period3/25/143/27/14

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Fuel Technology

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    Mo, K., Yun, D., Lv, W., Miao, Y., Tung, H. M., & Stubbins, J. F. (2017). Biaxial thermal creep of alloy 617 and alloy 230 for vhtr applications. In ASME 2014 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries, ETAM 2014 (ASME 2014 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries, ETAM 2014). American Society of Mechanical Engineers. https://doi.org/10.1115/ETAM2014-1002