钛合金冲击性能与动态压缩性能间的定量关系

Quantitative relationship between impact property and dynamic compressive performance of Ti alloy

为认识钛合金的冲击性能与冷镦成品率的关系,运用组织定量统计分析的方法研究了Ti-3Al-5Mo-4.5V钛合金显微组织参数对冲击性能的影响规律,结合动态压缩后的剪切带宽度变化规律,探讨了裂纹形成功、裂纹扩展功以及冲击功与剪切带宽度之间的关系.结果表明:随着退火温度的上升,α片长宽比先增加后减小,裂纹形成功也是先上升后下降,而裂纹扩展功却是先减小后增加,冲击总功持续上升;冲击功指标与材料的动态压缩性能未发现必然联系,裂纹形成功与动态压缩后的剪切带宽度成反比例关系,而裂纹扩展功与剪切带宽度线性正相关.

To explore the relationship between impact property and cold upsetting finished product ratio of Ti alloy,the effect of microstructure parameter on impact property of Ti-3Al-5Mo-4.5V alloy was investigated systemically with quantitative statistical analysis method. The relationship among crack initiation energy, crack propagation energy, total impact energy and the width of shear band was analyzed combined with the variety of the width of shear band after dynamic compressive deformation. The result shows as follows. First, as anneal temperature rises, α platelet ratio（length/width） increases first and then decreases, crack initiation energy ascends first and then descends, while crack propagation energy diminishes first and then increases, and total impact energy ascends persistently. Second, there is no certain relationship between total impact energy and dynamic compressive performance; crack initiation energy is in inverse proportion to the width of shear band, while there is a positive correlation between the crack propagation energy and the width of shear band linearly.