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采用粉末冶金法制备钨合金棒材,通过锻造变形的方法进一步提高钨合金棒材的力学性能,并采用混合率模型计算不同状态钨合金的强度。与实验结果比较发现,应力传递模型可以很好地反应随着变形量增加钨合金强度增加的变化趋势。通过对变形强化钨合金轴向和径向力学性能、断口特征、金相组织的比较以及钨合金在承载过程中的定量力学分析指出,随着钨合金变形量的增加,大面积的基体相韧窝断裂被基体撕裂棱状断裂和钨颗粒的穿晶解理断裂所取代,这也是导致合金强度提高的原因。
The tungsten alloy rods were prepared by powder metallurgy method, the mechanical properties of the tungsten alloy rods were further improved by the forging deformation method, and the strength of the tungsten alloy in different states was calculated by the mixing rate model. Compared with the experimental results, it is found that the stress transfer model can well reflect the trend of the increase of tungsten alloy strength with the amount of deformation. Through the axial and radial mechanical properties of deformed Tungsten alloy deformation, fracture characteristics, comparison of microstructure and quantitative mechanical analysis of tungsten alloy bearing process, pointed out that with the increase of deformation of tungsten alloy, a large area of the matrix phase tough Nest fractures were ruptured by the substrate rupture and transgranular cleavage of tungsten particles replaced by the cleavage, which is the reason leading to the strength of the alloy.