Abstract
Creep strength of martensitic steels under creep conditions is critically dependent on stability of TMLS. Its transformation to well-defined subgrain structure followed by migration of subgrain boundaries corresponds with loss of creep resistance. The onset of migration of lath/subgrain boundaries in a Co-modified P92-type steels upon creep is attributed to a balance between driving and retarding forces. Both driving forces due to high dislocation density within lath interior and energy of low-angle boundaries give a rise their migration. Zener drag pressure is a major retarding force. The pinning pressure associates with a dispersion of M23C6 carbides situated on boundaries of prior austenite grains, packet, blocks and laths gives the main contribution to overall drag pressure. Under creep conditions the particles of Laves phase precipitate on these boundaries and exert additional drag force. MX carbonitrides homogeneously distributed within the ferritic matrix provides low value of Zener drag pressure.
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Fedoseeva, A., Dudova, N., Kaibyshev, R. (2016). Driving and Retarding Forces in Tempered Martensite Lath Structure. In: Holm, E.A., et al. Proceedings of the 6th International Conference on Recrystallization and Grain Growth (ReX&GG 2016). Springer, Cham. https://doi.org/10.1007/978-3-319-48770-0_18
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DOI: https://doi.org/10.1007/978-3-319-48770-0_18
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48626-0
Online ISBN: 978-3-319-48770-0
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