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Development of Analytical Evaluation Methods for Creep Failure in Weldments of High Chromium Steels and Application to Full Scale Pipe Experiments

[+] Author Affiliations
Yukio Takahashi, Satoshi Nishinoiri, Masatsugu Yaguchi

Central Research Institute of Electric Power Industry, Yokosuka, Japan

Paper No. PVP2016-63834, pp. V06AT06A064; 10 pages
doi:10.1115/PVP2016-63834
From:
  • ASME 2016 Pressure Vessels and Piping Conference
  • Volume 6A: Materials and Fabrication
  • Vancouver, British Columbia, Canada, July 17–21, 2016
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5042-8
  • Copyright © 2016 by ASME

abstract

Creep strength Enhanced Ferritic (CSEF) steels containing chromium of 9 to 12 weight percent are widely used in fossil power plants operated all over the world under ultra-super critical (USC) steam condition. Type-IV cracking has been observed in weldments of these steels in a number of plants using these materials and prediction of failure due to such cracking or damage is of critical importance for operators of these plants. In order to address such a need, analytical life estimation methods are under development by the authors. Creep strain equations for different parts of welded joints have been developed based on the creep test data of small-sized specimens for both typical 9 Cr and 12Cr type steels designated Grade 91 and Grade 122. Failure criteria based on inelastic strain as well as inelastic strain energy density have also been developed based on the test data on small-sized cross-weld specimens. Finite element analyses incorporating them have been performed on the full-scale hot reheat pipes of Grade 91 and Grade 122 with circumferential weldments tested under inner pressure and bending moment. Reasonable agreements have been obtained between the time of local failure predicted by a newly developed energy-based approach and the time at which indications were detected by ultrasonic testing firstly.

Copyright © 2016 by ASME

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