Mechanical Properties of σ-Phase and Its Effect on the Mechanical Properties of Austenitic Stainless Steel
Open Access
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.Keywords
Funding Information
- National Key Research & Development (R&D) Program of China (2022YFF0605600)
- Postgraduate Research & Practice Innovation Program of Jiangsu Province (College Project) (JXSS-019)
This publication has 60 references indexed in Scilit:
- Overview of Intermetallic Sigma () Phase Precipitation in Stainless SteelsISRN Metallurgy, 2012
- Effect of aging at 700°C on precipitation and toughness of AISI 321 and AISI 347 austenitic stainless steel weldsNuclear Engineering and Design, 2005
- Measurement of hardness and elastic modulus by instrumented indentation: Advances in understanding and refinements to methodologyJournal of Materials Research, 2004
- The effect of high-temperature exposure on the microstructural stability and toughness property in a 2205 duplex stainless steelMaterials Science and Engineering: A, 2002
- Microstructural evolution and change in hardness in type 304H stainless steel during long-term creepMaterials Science and Engineering: A, 2001
- Site occupancy in the Re-W sigma phasePhysical Review B, 2001
- Strain gradient plasticity: Theory and experimentActa Metallurgica et Materialia, 1994
- An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experimentsJournal of Materials Research, 1992
- σ phase embrittlement of a type 310 stainless steelMaterials Science and Engineering: A, 1991
- The influence of sigma phase on creep ductility in type 316 stainless steelScripta Metallurgica, 1979