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Influence of the Austempering Time on the Mechanical Properties of Carbide-Free Bainitic Cast Steels
- Source :
- International Journal of Metalcasting. 15:906-915
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- Three medium-carbon, high-silicon cast steels with different alloy contents were austempered at 330 °C for different holding times in order to obtain carbide-free bainitic microstructures. Aiming at evaluating the influence of holding time and microstructural features on strength and ductility, tensile properties were measured for each steel at selected austempering times. The results obtained indicate that it is possible to adjust holding time in order to obtain the best strength/ductility combination at determined austempering temperature. Moreover, it has been shown that the mechanical stability of retained austenite is the key factor in controlling tensile performance. Short austempering times result in low carbon enrichment of the austenite (low stability) and promote higher ultimate tensile strength and lower ductility. For longer austempering times, steels present a slight decrease in ultimate tensile strength but a marked increase in ductility. This work shows that it is possible to obtain cast steels with ultimate tensile strength of 1682 MPa, yield strength of 1493 MPa and total elongation of 12.5% by means of bainitic reaction. This strength/ductility combination and others reported in this study are remarkable for cast steels.
- Subjects :
- Austenite
Structural material
Materials science
020502 materials
Metallurgy
Alloy
Metals and Alloys
02 engineering and technology
engineering.material
Microstructure
Industrial and Manufacturing Engineering
020501 mining & metallurgy
Carbide
0205 materials engineering
Mechanics of Materials
Ultimate tensile strength
Materials Chemistry
engineering
Ductility
Austempering
Subjects
Details
- ISSN :
- 21633193 and 19395981
- Volume :
- 15
- Database :
- OpenAIRE
- Journal :
- International Journal of Metalcasting
- Accession number :
- edsair.doi...........76d30d7fbc5a802239f06325795d4189