Elastic properties of heat resistant steels after long-term creep exposure

K. Sawada, T. Ohmura, T. Ohba, K. Tsuzaki, F. Abe, K. Kimura, I. Nonaka

研究成果: Contribution to journalArticle査読

抄録

In order to clarify the effect of microstructural change during ageing and creep on elastic modulus, the elastic moduli of aged, crept and serviced (service-exposed) materials were investigated. In ferritic steels, the elastic modulus obtained by ultrasonic pulse does not change after long-term ageing and creep although the formation of creep voids slightly decreases the elastic modulus. In SUS304 and SUS316, the elastic modulus evaluated by ultrasonic pulse increases during ageing due to precipitation of M23C6 carbides, Laves phase and σ phase though the elastic modulus decreases during creep because of the formation of creep voids on grain boundaries. The increased elastic modulus of aged material with a large amount of σ phase was regarded as that of composite consists of matrix and σ phase. For STBA24, the elastic modulus obtained by a high temperature tensile test decreases after long-term service. The tensile test at a higher strain rate was proposed to avoid underestimation of elastic modulus of serviced materials at high temperatures.

本文言語英語
ページ(範囲)179-185
ページ数7
ジャーナルMaterials at High Temperatures
25
3
DOI
出版ステータス出版済み - 11 21 2008
外部発表はい

All Science Journal Classification (ASJC) codes

  • セラミックおよび複合材料
  • 凝縮系物理学
  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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