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The Influence of Cooling Rate on Austenite Stability and Mechanical Properties in an Austenite–Ferrite Medium-Mn Steel.
- Source :
- Journal of Materials Engineering & Performance; Nov2021, Vol. 30 Issue 11, p7917-7925, 9p
- Publication Year :
- 2021
-
Abstract
- The impact of cooling rate on austenite stability and mechanical properties of a cold-rolled transformation-induced plasticity (TRIP) steel with nominal chemical composition of Fe-11Mn-4Al-0.2C (wt.%) was elucidated in the present study. Mechanical properties were obtained by tensile test and microstructure was analyzed by XRD, SEM, EMPA. Intercritical annealing in the range of 700~800 °C for 5min followed by either water-quenched or air-cooled, both led to a ferrite–austenite mixed microstructure. However, the austenite stability varied with the annealing temperature. The water-quenched and air-cooled samples annealed at 750 °C with medium austenite stability demonstrated significantly higher ductility than the samples annealed at 700 and 800 °C. The superior total elongation (TE) in 750 °C sample was not only contributed by TRIP effect of austenite, but also the cooperative deformation of ferrite. The air-cooled samples were characterized by higher austenite stability and ultimate tensile strength (UTS), but lower total elongation compared to the water-quenched samples, which is because the TRIP effect in the air-cooled samples without the cooperation of ferrite contributed primarily to work hardening and UTS, but less to TE. Moreover, the critical factor in controlling austenite stability of water-quenched sample was morphology, granular austenite showing the highest stability; while the dominant factor in austenite stability of the air-cooled sample was composition, enrichment of Mn and C improving austenite stability. [ABSTRACT FROM AUTHOR]
- Subjects :
- AUSTENITE
TENSILE strength
STRAIN hardening
TENSILE tests
STEEL
Subjects
Details
- Language :
- English
- ISSN :
- 10599495
- Volume :
- 30
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Journal of Materials Engineering & Performance
- Publication Type :
- Academic Journal
- Accession number :
- 153160094
- Full Text :
- https://doi.org/10.1007/s11665-021-05982-z