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| Hot deformation and processing map of GH2674 superalloy |
| Quan Ju;; |
| 北京科技大学材料科学与工程学院 |
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Cite this article:
Quan Ju. Hot deformation and processing map of GH2674 superalloy. Acta Metall Sin, 2006, 42(2): 218-224 .
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Abstract The hot deformation behavior of GH2674 has been studied in the temperature range 950-1200℃ and strain rate range 0.001-10 s-1, using hot compressing testing on a Gleeble-1500 simulator. A processing map is developed on the basis of these data and using the principles of dynamic material modeling. The map exhibits two domains: one at 1050℃ and 0.01 s-1, with a peak efficiency of power dissipation of 38%, the second at 1150℃ and 10s-1, with a peak efficiency of 40%. On the basis of optical microscopic observations, these they are interpreted to represent two dynamic recrystallization(DRX) domains, of which the mechanisms are different. The map also exhibits a long concave band in the temperature range 1075-1100℃，which may be related to the solutionizing of M3B2 phase. At temperatures lower than 1000℃ and strain rates higher than 0.1s-1, the material may be subjected to potential instabilities, while at temperatures higher than 1050℃ and strain rates lower than 0.01s-1 , the material exhibits significant grain coarsening, furthermore, the wedge cracking would appear at 1200℃ and 0.001s-1. On the basis of the constitutive behavior of GH2674 alloy as revealed in the processing map, the hot working schedules have been designed primarily
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Received: 24 May 2005
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