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

In this present paper, the mechanical properties of σ-phase and its effect on the mechanical properties of 304H austenitic stainless steel after servicing for about 8 years at 680–720 °C were studied by nano-indentation test, uniaxial tensile test, and impact test. The results showed that the nano-h...

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Published inCoatings (Basel) Vol. 12; no. 12; p. 1917
Main Authors Qiao, Peiheng, Xie, Jinyang, Jiang, Yong, Tang, Pengjie, Liang, Bin, Lu, Yilan, Gong, Jianming
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.12.2022
Subjects
Analysis
Austenitic stainless steels
Catalytic cracking
Composition
Elongation
Fractures
Hardness
Hardness tests
Impact strength
Impact tests
Intermetallic compounds
Laboratories
Mechanical properties
Microscopy
Modulus of elasticity
Nanohardness
Nanoindentation
Sigma phase
Stainless steel
Steel, Stainless
Strain hardening
Tensile strength
Tensile tests
Tension tests
Yield strength
Yield stress
China
United States > US
Germany
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Summary:In this present paper, the mechanical properties of σ-phase and its effect on the mechanical properties of 304H austenitic stainless steel after servicing for about 8 years at 680–720 °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 (σy) of σ-phase were 14.95 GPa, 263 GPa, 0.78, and 2.42 GPa, respectively. The presence of σ-phase increased the hardness, yield strength, and tensile strength, but greatly reduced the elongation and impact toughness of the material.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings12121917