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 correlation among the percentage reduction, mechanical properties and microstructure of 3 biphase W-Ni-Fe alloys swaged under lower temperature has been investigated. It was resulted that the strength and hardness of the alloys increase with the increase of their W contents. However, the alloys of higher W contents have no more strengthened under the reduction beyond 15%. The room temperature tensile strength and hardness may be increased about 50% if it is of 93% W. Their microstructure markedly shows that the W grains are elongated along the longitudinal working direction. The cleavage failure across W grains becomes the main mode of fracture and the slip bands can be observed on them. The deformation feature and the mechanism of these biphase W alloys have been also discussed. Furthermore, it is suggested that the superior mechnical properties as a whole of the alloys may be produced by the vacuum annealing at the temperature between 800—1200℃.
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