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Description:

The creep properties and microstructures of two types of Gr. 91 steel with different impurity (Sb, As, Sn) contents were investigated. The steel with higher impurity concentrations (Steel 1) ruptured in slightly shorter time than the steel with lower impurity concentrations (Steel 2). The reduction of area for Steel 1 was slightly lower than that for Steel 2 due to higher density of creep voids in Steel 1. However, no clear correlation was observed between impurity contents and either elongation or creep intolerance parameter (λ). Microstructural observation revealed that the effect of impurities on the initial microstructure was considered negligible. During creep, the crystallographic relationship between common rotation axes and rotation angles at block/packet boundaries gradually disappeared. Among block boundaries, <011>53° and <011>60° were found to be more susceptible to creep deformation, whereas <111>60° was relatively less sensitive.

Rights:

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

Keyword: creep strength enhanced ferritic steels, Type 2 specification, creep void, segregation, block/ packet boundaries

Date published: 2026-07-15

Publisher: Iron and Steel Institute of Japan

Journal:

• ISIJ International (ISSN: 09151559) vol. 66 issue. 8 ISIJINT-2026-044

Funding:

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

MDR DOI:

First published URL: https://doi.org/10.2355/isijinternational.isijint-2026-044

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Updated at: 2026-07-30 08:37:06 +0900

Published on MDR: 2026-07-30 10:31:01 +0900