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Effect of thermal ageing on microstructure, mechanical properties, and fracture behaviour of 50 % cold rolled duplex stainless steel (alloy 2507).
- Source :
- Materialwissenschaft und Werkstoffechnik; Jun2023, Vol. 54 Issue 6, p676-692, 17p
- Publication Year :
- 2023
-
Abstract
- The paper deals with cold rolling and ageing on microstructure and mechanical properties of 2507 duplex stainless steel. Microstructure depicts acicular/Widmanstätten austenite and δ‐ferrite with dissimilar volume fraction (∼0.55 for ferrite and ∼0.45 for austenite). Cold rolling and ageing at 950 °C, 1000 °C and 1050 °C result in equiaxed austenite for samples solution treated at 1040 °C and elongated at 1300 °C. By lowering ageing temperature from 1050 °C to 950 °C, structure becomes finer from ∼20 μm to <10 μm grain size. The sigma (σ) phase appears after ageing at 950 °C. Micro‐hardness reveals maximum hardness for the hot rolled, solutionized (1040 °C) water quenched, and cold rolled (50 %) sample (380 HVδF 100 and 430 HVγ 100), whereas the tensile results reveal the hot rolled, solution treated (1300 °C, 1040 °C), cold rolled and aged at 950 °C samples show higher strength (yield strength=625 MPa, 567 MPa and ultimate tensile strength=892 MPa, 826 MPa) and lower ductility (23 %, 32 %) due to the σ‐phase. The solution treated (1040 °C), cold rolled, aged at 1050 °C sample exhibits attractive strength and ductility combination (∼30 GPa %). Fractography supports the tensile results. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09335137
- Volume :
- 54
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Materialwissenschaft und Werkstoffechnik
- Publication Type :
- Academic Journal
- Accession number :
- 164307250
- Full Text :
- https://doi.org/10.1002/mawe.202200231