钨合金材料锻造变形强化的组织与性能及其再结晶行为

Microstructure,mechanical property and recrystallization behavior of swage strengthened tungsten alloy

对不同锻造变形量的钨合金材料组织、性能及其再结晶行为进行了研究。结果表明,变形量的增加导致了钨合金组织的“纤维化”和强度的提高,变形钨合金在低于液相烧结温度以下热处理时,其再结晶过程缓慢,再结晶晶粒所占比例较小且比较细小。在液相烧结温度以上热处理将会迅速完成其再结晶—球化—晶粒长大的过程,此过程将导致变形强化效果丧失,力学性能下降。

The investigation was made on microstructure, mechanical property and recrystallization behavior of tungsten alloy with different amount of swaged deformation. The results show that the increase of deformation levels leads to fibrous microstructures and strength improvement. When heat treated under liguid sintering temperature, the recrystallization advances slowly, the recrystallized grains are fewer and smaller; When heat treated above liquid sintering temperature, tungsten alloy will experience recrystallization, spheroidization and grain growth, which results in the decrease of mechanical property and disappearance of strengt-hened effect.