Mechanical Properties of σ-Phase and Its Effect on the Mechanical Properties of Austenitic Stainless Steel
Peiheng Qiao, Jinyang Xie, Yong Jiang, Pengjie Tang, Bin Liang, Yilan Lu, Jianming Gong
Abstract
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.
Topics & Concepts
Materials scienceUltimate tensile strengthStrain hardening exponentElongationAusteniteComposite materialIndentationToughnessTensile testingNanoindentationModulusUniaxial tensionPhase (matter)Young's modulusAustenitic stainless steelHardening (computing)Yield (engineering)Vickers hardness testMicrostructureCorrosionLayer (electronics)Organic chemistryChemistryMetal and Thin Film MechanicsMicrostructure and Mechanical Properties of SteelsHydrogen embrittlement and corrosion behaviors in metals