Nondestructive Evaluation of Long-Term Creep Damage and Its Availability in ASME Grade 91 Steel Welds

DOI Web Site 8 References
  • SAWADA Kota
    Microdevices Research Center for Structural Materials, National Institute for Materials Science
  • TANIUCHI Yasushi
    Microdevices Research Center for Structural Materials, National Institute for Materials Science
  • NOJIMA Takehiro
    Microdevices Research Center for Structural Materials, National Institute for Materials Science
  • KIMURA Kazuhiro
    Microdevices Research Center for Structural Materials, National Institute for Materials Science
  • KIMURA Takahiro
    Technology & Intelligence Integration, IHI corporation
  • NOMURA Kyohei
    Technology & Intelligence Integration, IHI corporation
  • SAITO Noriko
    Resources, Energy & Environment Business Area, IHI corporation
  • MORITA Akira
    R & D Center, The Kansai Electric Power Co., Inc.
  • HAYAKAWA Hiroyuki
    Technical Solution Headquarters, Kyushu Electric Power Co., Inc.
  • SUGIUCHI Takao
    Energia Research Institute, The Chugoku Electric Power Co., Inc.
  • OHBITSU Kazushige
    Energia Research Institute, The Chugoku Electric Power Co., Inc.
  • ISHIHARA Junichi
    Energia Research Institute, The Chugoku Electric Power Co., Inc.
  • YAGUCHI Masatsugu
    Energy Transformation Research Laboratory, Central Research Institute of Electric Power Industry
  • NISHIZAWA Koju
    TEPCO Research Institute, Tokyo Electric Power Company Holdings, Inc.
  • IIDA Hideo
    TEPCO Research Institute, Tokyo Electric Power Company Holdings, Inc.
  • OHI Kouji
    Engineering Department, Tokyo Power Technology Ltd.
  • NISHIOKA Tomoya
    Hanshin Unit, Nippon Steel Technology Co., Ltd.
  • EMI Naoya
    Hanshin Unit, Nippon Steel Technology Co., Ltd.
  • OKADA Hirokazu
    Hanshin Unit, Nippon Steel Technology Co., Ltd.
  • KOMAI Nobuyoshi
    Research & Innovation Center, Mitsubishi Heavy Industries, Ltd.
  • HAYASHI Kyohei
    Research & Innovation Center, Mitsubishi Heavy Industries, Ltd.
  • TOMINAGA Kimihiko
    Boiler Engineering Department, Mitsubishi Heavy Industries, Ltd.

Bibliographic Information

Other Title
  • ASME Grade 91鋼大型溶接継手の長時間クリープ損傷の非破壊評価とその有効性検討

Abstract

<p>In order to evaluate residual creep life of ASME Grade 91 weldment, Phased Array Ultrasonic Testing (PAUT), High Temperature Superconductor - direct current - Superconducting Quantum Interference Device (ECT・HTS-dc-SQUID), observation of replica and hardness measurement were used to detect creep damages for creep interrupted specimens. It was clarified that the threshold of the creep damage that PAUT and ECT・HTS-dc-SQUID could detect appear in later stage of creep deformation. Creep voids were detected on the replica obtained from surface of creep specimens just before creep rupture. Capacitive strain sensor, laser displacement meter and SPICA strain measurement were tried to detect creep strain. Creep curves by the capacitive strain sensor and laser displacement meter were similar with that of conventional extensometer with a linear gauge. Strain measured by SPICA in heat affected zone monotonously increased during creep. Strain measured by capacitive strain sensor, laser displacement meter and SPICA and damage detected by PAUT and ECT・HTS-dc-SQUID were assumed to be useful for residual creep life assessment.</p>

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