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June 11, 2026ISIJ InternationalOpen Access

Insights into creep properties and microstructure of Gr. 91 steels with varied impurity contents

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Authors

KSKatsuhiro SatōMMMasatoshi MitsuharaTKTakahiro Kimura

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Overview

Investigation of creep properties in Gr. 91 steels with different impurity levels, revealing implications for steel performance.

Key Points

  • This research aims to understand how varied impurity contents affect the creep properties and microstructural characteristics of Gr. 91 steels.
  • Investigated two types of Gr. 91 steel with different impurity contents (Sb, As, Sn).
  • Conducted microstructural observations and creep tests to evaluate the performance of each steel type.
  • Analyzed the relationship between impurity levels and various creep parameters.
  • Steel 1 (higher impurity) ruptured in shorter time than Steel 2 (lower impurity), indicating reduced creep resistance.
  • Steel 1 exhibited a lower reduction of area compared to Steel 2 due to a higher density of creep voids.
  • The impact of impurities on the initial microstructure was negligible, yet Steel 1 showed a more pronounced loss of crystallographic relationships during creep.

Cite This Study

Satō et al. (2026) studied this question.

synapsesocial.com/papers/6a2a503380c8f91e7f39cc03https://doi.org/10.2355/isijinternational.isijint-2026-044
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