NONDESTRUCTIVE DETECTION OF CREEP DAMAGE IN ASME GRADE 91 STEEL WELDS

Kota Sawada; Yasushi Taniuchi; Takehiro Nojima; Kazuhiro Kimura; Takahiro Kimura; Kyohei Nomura; Noriko Saito; Akira Morita; Hiroyuki Hayakawa; Takao Sugiuchi; Kazushige Ohbitsu; Masatsugu Yaguchi; Koju Nishizawa; Hiroshi Ozaki; Hayato Fukunishi; Kouji Ohi; Tomoya Nishioka; Naoya Emi; Hirokazu Okada; Nobuyoshi Komai; Kyohei Hayashi; Kimihiko Tominaga

doi:10.31399/asm.cp.am-epri-2024p0960

Conference paper NONDESTRUCTIVE DETECTION OF CREEP DAMAGE IN ASME GRADE 91 STEEL WELDS

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Kota Sawada, Yasushi Taniuchi, Takehiro Nojima, Kazuhiro Kimura, Takahiro Kimura, Kyohei Nomura, Noriko Saito, Akira Morita, Hiroyuki Hayakawa, Takao Sugiuchi, Kazushige Ohbitsu, Masatsugu Yaguchi, Koju Nishizawa, Hiroshi Ozaki, Hayato Fukunishi, Kouji Ohi, Tomoya Nishioka, Naoya Emi, Hirokazu Okada, Nobuyoshi Komai, Kyohei Hayashi, Kimihiko Tominaga. NONDESTRUCTIVE DETECTION OF CREEP DAMAGE IN ASME GRADE 91 STEEL WELDS. https://doi.org/10.31399/asm.cp.am-epri-2024p0960

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Nondestructive phased array ultrasonic testing (PAUT), eddy current testing with a high-temperature superconductor, direct current, and superconducting quantum interference device (ECT• HTS-dc-SQUID) and observation of a replica were conducted to detect creep damage of Grade 91 steel welds. Creep strain measurements were also performed for residual life assessment of the welds. PAUT showed that the threshold of creep damage detection was between 60% and 80% of the creep life. In the case of ECT• HTS-dc-SQUID, the threshold was between 80% and 90% of the creep life. Creep voids were observed on the replica just before creep rupture. A capacitive strain sensor, laser displacement meter, and SPICA strain measurement were used to detect changes in the strain during creep exposure. The capacitive strain sensor can continuously measure the strain during creep exposure. The laser displacement meter was used after creep interruption. Creep curves obtained by the capacitive strain sensor and laser displacement meter w

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Copyright © 2024 ASM International. All rights reserved.
Copyright ASM International. This paper was published in Advances in Materials for Power Plants, 2024 Conference Proceedings, and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this article for a fee or for commercial purposes, or modification of the content of this article is prohibited.

Keyword: Gr.91 steel welds, creep, damage, nondestructive evaluation

Date published: 2024-10-15

Publisher: ASM International

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Advances in Materials for Power Plants p. 960-968 am-epri-2024p0960

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Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.31399/asm.cp.am-epri-2024p0960

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Updated at: 2024-11-06 16:31:04 +0900

Published on MDR: 2024-11-06 16:31:04 +0900

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