OPTIMIZING HIGH TEMPERATURE DEFORMATION THERMOMECHANICAL PARAMETERS OF TC11 TITANIUM ALLOY BY MEANS OF MURTY CRITERION

Acta Metall Sin

2007, Vol. 43

Issue (12): 1268-1274 DOI:

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OPTIMIZING HIGH TEMPERATURE DEFORMATION THERMOMECHANICAL PARAMETERS OF TC11 TITANIUM ALLOY BY MEANS OF MURTY CRITERION

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江西省南昌市丰和南大道南昌航空工业学院材料学院

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;. OPTIMIZING HIGH TEMPERATURE DEFORMATION THERMOMECHANICAL PARAMETERS OF TC11 TITANIUM ALLOY BY MEANS OF MURTY CRITERION. Acta Metall Sin, 2007, 43(12): 1268-1274 .

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Abstract Hot compression tests of TC11 titanium alloy with equiaxed starting microstructure were conducted by using the Thermecmastor-Z hot working simulator. Microstructural deformation mechanisms and the manifestations of flow instability were investigated by means of processing map’ technology based on Murty criterion, and deformation thermomechanical parameters were optimized in the temperature range 990℃～1008℃ and strain rate range 0.001 s-1～70s-1. The results showed that，in phase，the desired deformation thermomechanical parameters were in 990℃～1008℃ and 0.001 s-1～0.02 s-1 with the deformation mechanism of superplasticity，and the optimum deformation thermomechanical parameters were in the order of 990℃ and 0.001 s-1.In phase，the desired deformation thermomechanical parameters were in 1030℃～1080℃ and 0.001 s-1～0.1 s-1 at the strains below 0.6 and in 1020℃～1060℃ and 0.004s-1～0.6 s-1 at the strains beyond 0.6，both of the two regions underwent dynamic recrystallization，and the corresponding optimum deformation thermomechanical parameters were respectively in 1060℃～1080℃and 0.001 s-1 , 1040℃～1050℃ and 0.016 s-1～0.07 s-1. The region of flow instability occurred in the temperature range 1000℃～1080℃and strain rate 4.0 s-1～70 s-1 in phase，and the manifestations of flow instability is non-uniform deformation of grains. In phase , dynamic growth of grains would occur approximately at the strain rate of 0.001 s-1.

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Received: 26 March 2007

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