Degradation of a Cr-Mo steel by carbide precipitation over long-term service

Lyu, Zhe; Kannan, Rangasayee; Saini, Nitin; Li, Jing; Li, Leijun

doi:10.1016/j.msea.2024.146354

Degradation of a Cr-Mo steel by carbide precipitation over long-term service

Journal Article · Tue Mar 12 00:00:00 EDT 2024 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2024.146354· OSTI ID:2326294

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Univ. of Alberta, Edmonton, AB (Canada)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Microstructure of the 40-year service-exposed 1Cr-0.5Mo steel extracted from pressure vessels through the boat sampling technique was characterized using x-ray diffraction, field-emission scanning electron microscopy, energy dispersive spectrometry, electron backscatter diffraction, focused ion beam, and transmission electron microscopy. The microstructure degradation during long-term service was identified. Statistical crystal plastic ity models were developed to correlate the microstructure and mechanical properties quantitatively. The steel is found significantly strengthened but slightly embrittled. Nanoscale Mo₂C carbides have nucleated within the ferrite matrix over the long-term service, resulting in significant strengthening of the matrix. The coarser grain boundary Cr₂₃C₆ carbides, on the other hand, act as the damage accumulation sites and lead to the degradation.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2326294

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Vol. 898; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Degradation of a Cr-Mo steel by carbide precipitation over long-term service

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