4.6 Article

Mechanical Properties of σ-Phase and Its Effect on the Mechanical Properties of Austenitic Stainless Steel

期刊

COATINGS
卷 12, 期 12, 页码 -

出版社

MDPI
DOI: 10.3390/coatings12121917

关键词

sigma-phase; austenitic stainless steel; nano-indentation; mechanical properties

资金

  1. National Key Research & Development (R&D) Program of China
  2. Postgraduate Research & Practice Innovation Program of Jiangsu Province (College Project)
  3. [2022YFF0605600]
  4. [JXSS-019]

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This study investigated the mechanical properties and the influence of sigma-phase on 304H austenitic stainless steel. The results showed that the presence of sigma-phase increased the hardness and strength of the material, but decreased its ductility and impact toughness.
In this present paper, the mechanical properties of sigma-phase and its effect on the mechanical properties of 304H austenitic stainless steel after servicing for about 8 years at 680-720 degrees C were studied by nano-indentation test, uniaxial tensile test, and impact test. The results showed that the nano-hardness (H), Young's modulus (E), strain hardening exponent (n), and yield strength (sigma(y)) of sigma-phase were 14.95 GPa, 263 GPa, 0.78, and 2.42 GPa, respectively. The presence of sigma-phase increased the hardness, yield strength, and tensile strength, but greatly reduced the elongation and impact toughness of the material.

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