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GH4706 alloy dynamic recrystallization and grain control

Time:2016-10-19 15:57:21

The GH4706 (IN706) alloy is an Fe-Ni based superalloy, and the major secondary phases are γ 'phase, γ' 'phase, η phase and MC type carbide. Because GH4706 alloy has excellent castability, easy processability and reliable high temperature mechanical properties, and therefore suitable for the preparation of over 2000mm diameter of the oversized disk forging. At present, the international mainstream "E" class, "F" class heavy-duty turbine turbine disk material used more GH4706 alloy manufacturing.

 
The microstructures of the GH4706 alloy steel were studied by means of a double cone compression specimen. The microstructures of the alloy were investigated by means of a two - cone compression specimen. The microstructures, (DRX) mechanism and critical condition of GH4706 alloy on the one hand, and provide a theoretical support for the physical model of numerical simulation. On the other hand, a new method to control GH4706 alloy grain by η phase is explored. The results show:
 
(1) DRX mechanism of GH4706 alloy is strain-induced primary grain boundary discontinuous bowing, DRX critical temperature TDRX is 975 ℃, the critical deformation depends on the deformation temperature and deformation heat, the deformation temperature is lower than TDRX, the alloy DRX Is due to the deformation of the heat caused by the sample temperature rise;
 
(2) When the deformation temperature is higher than TDRX, the grain size after heat treatment of GH4706 alloy depends on the deformation temperature and has nothing to do with the deformation; when the deformation temperature is lower than TDRX, the grain size after heat treatment has little relation with the deformation temperature, And decreases with the increase of deformation.
 
(3) Under the temperature slightly lower than TDRX deformation, because there are still part of the alloy η phase residues, can make full use of this part of the relative subgrain boundary or grain boundary pinning effect, by increasing the amount of deformation to achieve GH4706 alloy Grain refinement.
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