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<p>The influence of service exposure on creep crack growth behavior on compact-tension specimens of P91 steel was investigated at 625&#xa0;°C. The initial microstructure of ex-service material consisted of brittle Laves phase and higher geometrically necessary dislocation density owing to service damage, as compared to the virgin material. The ex-service material exhibited a comparatively higher crack growth rate and crack extension under similar test conditions. Similar creep fracture mode was observed in both the materials.</p>

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Effect of Service Exposure on Creep Crack Growth Nature of P91 Steel

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Chandra Veer Singh,
  • Sumanta Bagui,
  • John Siefert,
  • Soumitra Tarafder

摘要

The influence of service exposure on creep crack growth behavior on compact-tension specimens of P91 steel was investigated at 625 °C. The initial microstructure of ex-service material consisted of brittle Laves phase and higher geometrically necessary dislocation density owing to service damage, as compared to the virgin material. The ex-service material exhibited a comparatively higher crack growth rate and crack extension under similar test conditions. Similar creep fracture mode was observed in both the materials.