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Dynamic recrystallisation behaviour and microstructural evolution in a Mn–Cr gear steel.
- Source :
-
Materials Science & Technology . Jul2005, Vol. 21 Issue 7, p798-802. 5p. 1 Chart, 3 Graphs. - Publication Year :
- 2005
-
Abstract
- Using a Gleeble 1500 hot simulator, the dynamic recrystallisation (DRX) behaviour and changes of DRX grain size of a Mn–Cr type gear steel have been investigated at deformation temperatures of 900–1150°C, strain rates of 0·1–1 s-1, and initial austenite grain sizes of 70–150μm. The experimental results show that the Mn–Cr gear steel exhibits a typical DRX behaviour under higher deformation temperatures, lower strain rates and smaller initial austenite grain sizes. The DRX takes place under conditions such that the Zener–Hollomon parameter Z is less than a critical value Zc. By regression analysis, activation energy and stress exponent were determined to be 378 kJ mol-1 and 5·8 respectively. The DRX grain size is a power law function of Z with an exponent of -0·25. The reason why the Z parameter determines uniquely the DRX grain size was analyzed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02670836
- Volume :
- 21
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Materials Science & Technology
- Publication Type :
- Academic Journal
- Accession number :
- 17752094
- Full Text :
- https://doi.org/10.1179/174328405X43036