Mandal, G K and Kumar, Sudhir and Kumar, Tipu and Srivastava, V C (2017) Hot Deformation Behaviour of a Nb-Mo Linepipe Steel. Transaction of the Indian Institute of Metals, 70(7) (IF-0.533). pp. 1943-1951.
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Abstract
In linepipe steels, strength and toughness are tailored not only by designing microalloyed compositions but also by controlling hot working process, in order to obtain homogenized and refined microstructure. In the present study, microalloyed steel akin to X80 grade linepipe composition was investigated to examine the effect of hot deformation conditions on the flow behaviour. The isothermal hot compression experiments were carried out on Gleeble (TM) 3800 thermo-mechanical simulator, with varying strain rates of 0.1, 0.5 and 1 s(-1), at different temperatures of 950, 1000, 1050 and 1100 degrees C. The material was homogenized at 1200 degrees C and cooled to deformation temperature prior to hot compression. Dynamic recrystallisation (DRX) parameters were estimated from the observed flow behaviour. Based on the analysis, a correlation was obtained that described the DRX behaviour of the studied steel. The apparent activation energy (Q(def)) for DRX was determined as 480 kJ/mol. This value was considerably higher than that for plain C-Mn steel and gave a favourable DRX condition for grain refinement in linepipe steels.
| Item Type: | Article |
|---|---|
| Official URL/DOI: | https://link.springer.com/article/10.1007/s12666-0... |
| Uncontrolled Keywords: | In linepipe steels, strength and toughness are tailored not only by designing microalloyed compositions but also by controlling hot working process, in order to obtain homogenized and refined microstructure. In the present study, microalloyed steel akin to X80 grade linepipe composition was investigated to examine the effect of hot deformation conditions on the flow behaviour. The isothermal hot compression experiments were carried out on Gleeble (TM) 3800 thermo-mechanical simulator, with varying strain rates of 0.1, 0.5 and 1 s(-1), at different temperatures of 950, 1000, 1050 and 1100 degrees C. The material was homogenized at 1200 degrees C and cooled to deformation temperature prior to hot compression. Dynamic recrystallisation (DRX) parameters were estimated from the observed flow behaviour. Based on the analysis, a correlation was obtained that described the DRX behaviour of the studied steel. The apparent activation energy (Q(def)) for DRX was determined as 480 kJ/mol. This value was considerably higher than that for plain C-Mn steel and gave a favourable DRX condition for grain refinement in linepipe steels. |
| Divisions: | Metal Extraction and Forming |
| ID Code: | 7624 |
| Deposited By: | Sahu A K |
| Deposited On: | 18 Aug 2017 17:42 |
| Last Modified: | 18 Sep 2017 15:33 |
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