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Creep strength and material degradation of heat-resistant steel were discussed, focusing on microstructural changes during long-term creep exposure. For determining the allowable stress, the 100,000h creep rupture strength should be evaluated based on creep rupture data. The selection of TTP and dividing the creep rupture data set are important to evaluate long-term creep strength when creep strength degradation occurs in the long term. In order to establish the allowable stress, minimum creep strength must also be evaluated. The minimum creep strength depends on the standard error of estimate (SEE) for creep rupture data. If the heat-to-heat variation of creep strength is large even for the same material specification, the value of SEE is estimated to be large. Therefore, it is important to clarify the reason for the heat-to-heat variation of creep strength in terms of microstructural changes and chemical compositions.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: heat-resistant steels, long-term creep, microstructural changes, heat-to-heat variation

刊行年月日: 2026-09-01

出版者: The Japan Institute of Metals and Materials

掲載誌:

• MATERIALS TRANSACTIONS (ISSN: 13459678) vol. 67 issue. 9 MT-M2026047

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.2320/matertrans.mt-m2026047

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更新時刻: 2026-08-25 13:46:20 +0900

MDRでの公開時刻: 2026-08-25 16:27:38 +0900