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Creep Damage Evaluation for Fine Grained HAZ of Mod. 9Cr Steels Under Multi-Axial Stress Conditions

[+] Author Affiliations
Kimiaki Yoshida, Masataka Yatomi

IHI Corporation, Yokohama, Kanagawa, Japan

Masaaki Tabuchi

National Institute for Materials Science, Tsukuba, Ibaraki, Japan

Ken-ichi Kobayashi

Chiba University, Chiba, Chiba, Japan

Paper No. PVP2013-97406, pp. V003T03A107; 7 pages
  • ASME 2013 Pressure Vessels and Piping Conference
  • Volume 3: Design and Analysis
  • Paris, France, July 14–18, 2013
  • Conference Sponsors: Pressure Vessels and Piping Division, Nondestructive Evaluation Engineering Division
  • ISBN: 978-0-7918-5567-6
  • Copyright © 2013 by ASME


This study is concerned with the creep damage evaluation for the fine grained heat affected zone (HAZ) of modified 9Cr steels under multi-axial stress conditions. Circumferentially notched bar creep rupture and interrupted tests have been conducted on the simulated HAZ specimens of modified 9Cr Steels. A metallographic examination has been carried out to quantify creep damage accumulation in the specimens. It has been found from void observation that growth of creep void correlates with maximum principle stress and stress triaxiality factor. Finite element predictions based on ductility exhaustion approach have also been performed to predict the creep rupture time and creep damage in notched specimens. It has been concluded that a ductility exhaustion approach with empirical model provides reasonable life predictability almost in a scatter band of a factor of 2.

Copyright © 2013 by ASME
Topics: Creep , Steel , Stress



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