Deformation Stored Energy and Dynamic Recrystallization Behavior of Pure Tungsten Processed by Multiple Directional Forging

作者：Sun Dazhi; Li Ping^*; Lin Quan; Hua Rui; Xue Kemin; Wu Yucheng

来源：Rare Metal Materials and Engineering, 2018, 47(3): 937-942.

• multiple directional forging
• deformation stored energy
• dislocation
• dynamic recrystallization
• high-angle grain boundaries

Microstructure evolution and change of deformation stored energy of sintered pure tungsten during multi-directional forging were investigated by OM and DSC. The source of deformation stored energy and dynamic recrystallization behavior of pure tungsten were studied by XRD and EBSD. The results indicate that dynamic recrystallization during hot deformation leads to remarkable grain refining with porosity significantly decreasing. The high-density dislocation structure that remains in the grains and subgrains results in an increase in stored energy of deformation after deformation, There are quantities of recrystallized grains distributed along the higher energy zone in grain boundaries and grain boundary intersection. The mechanism of dynamic recrystallization is the mixture of deformation induced grain boundary migration mechanism with subgrain coarsening and mechanical fragmentation of grains. The recrystallization temperature of pure tungsten is unchanged substantially, and with thermal stability is increased after multiple directional forging.

• 出版日期2018-3
• 单位合肥工业大学