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NONDESTRUCTIVE DETECTION OF CREEP DAMAGE IN ASME GRADE 91 STEEL WELDS
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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- 15/10/2024
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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.
- Copyright © 2024 ASM International. All rights reserved.
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