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采用低温旋锻方式,研究了三种钨含量的W-Ni-Fe合金的形变强化过程中形变量、力学性能和显微组织之间的关系。指出:随着钨含量的增加,变形合金的强度、硬度增加;当变形量超过15%后,高钨含量合金的形变强化作用逐渐减小,此时93%W合金的室温抗拉强度和硬度值都分别提高到大约50%;合金的显微组织中钨颗粒明显沿棒料轴向拉长;解理断裂成为断口形貌的主要方式;并呈现出钨颗粒的断裂面上的滑移带。本文还讨论了两相钨合金的形变特点和形变机制。最后采用800—1000℃真空退火处理,使变形钨合金的综合力学性能达到最佳水平。
The relationship between the amount of deformation, the mechanical properties and the microstructure of W-Ni-Fe alloy with three tungsten contents was studied by means of low-temperature swaging. The results show that with the increase of tungsten content, the strength and hardness of the deformed alloy increase. When the deformation exceeds 15%, the deformation strengthening of the high tungsten content alloy decreases gradually. At room temperature, the tensile strength and hardness The values are increased to about 50%, respectively. In the microstructure of the alloy, the tungsten particles obviously elongate along the axial direction of the bar; the main mode of cleavage fracture becomes the fracture morphology; and the slip band on the fracture surface of the tungsten particle . The article also discusses the deformation characteristics and deformation mechanism of two-phase tungsten alloy. Finally, the vacuum annealing 800-1000 ℃, the deformation of the tungsten alloy to achieve the best overall mechanical properties.