Effect of plastic strain and recovery rate on thermal fatigue behavior in high heat-resistant ferritic stainless steel SUS444

Tetsuyuki Nakamura, Shin Ishikawa, Kyosuke Yoshimi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Ferritic stainless steels are used for automobile exhaust parts because of their high heat and corrosion resistances. Among them, parts located upstream near engine, so-called hot-end parts, for example, exhaust manifolds, are required to show excellent heat resistance. Since thermal fatigue is induced by repeating heating and cooling with strain restriction, thermal fatigue resistance is one of the most important properties for upstream exhaust-parts materials. In this study, the effect of plastic strain and recovery rate on thermal fatigue behavior was investigated for high heat-resistant ferritic stainless steel SUS444 which has been used for automobile exhaust parts. In the case of a maximum temperature at 973 K, cracking occurred without necking. On the other hand, in the case of a maximum temperature at and above 1073 K, failure with necking was predominant. To improve the thermal fatigue resistance of SUS444 in a higher-temperature exhaust gas atmosphere, high-temperature strengthening would be more favorable.

Original languageEnglish
Pages (from-to)517-523
Number of pages7
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume104
Issue number9
DOIs
Publication statusPublished - 2018 Jan 1

Keywords

  • Ferritic stainless steel
  • Fracture
  • Heat resistance
  • SUS444
  • Thermal fatigue

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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