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《Chinese Journal of Rare Metals》 2017-02
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Application of Multiple Integral Forging in Preparation of Wrought Superalloy FGH96 Turbine Disk

Fu Rui;Li Fulin;Yin Fajie;Feng Di;Hao Fang;Du Gang;Department of High-Temperature Materials,Central Iron and Steel Research Institute;Western Superconducting Technologies Co.,Ltd.;  
What the aeroengine material researchers focus on has always been the uniformity of microstructure and chemistry element in turbine disks with excellent comprehensive mechanical properties.Multiple integral forging is an important processing technology used for obtaining uniform billets with ultrafine grain microstructure,which could effectively improve the microstructure homogeneity and various properties of materials.Based on the electro-slag remelting directionally solidification wrought FGH96 alloy with low segregation levels and high purity,the deformation mechanism during multiple integral forging for the disk alloy was studied.The results showed that the size of dynamic recrystallized grain increased with the increase of deformation temperature,and the critical cumulative strain required for complete dynamic recrystallization decreased within the sub-solvus temperature range.The desired microstructure with appropriate grain size and second phases was obtained by the control of deformation temperature,rate and cumulative strain during the process of multiple integral forging.Compared to uniaxial forging,multiple integral forging could fully eliminate the forging streamlines,coarse deformed grains and shear zones,which greatly improved the homogeneity of microstructure.Finally,the microstructure during deformation was observed and analyzed to expound the recrystallization mechanism by means of transmission electron microscopy.
【Fund】: 国家科技部国际科技合作项目(2013DFB50180);; 陕西省科技统筹创新工程计划项目(2013KTLM-01;2015KTTSGY01-08)资助
【CateGory Index】: V263
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