TC18钛合金冲击缺口敏感性研究

Investigation on Notch Sensitivity of TC18 Titanium Alloy

摘要:

用XRD，SEM，TEM等手段对TC18钛合金进行显微组织结构分析。采用仪器化摆锤冲击试验机测试带有不同V型缺口深度TC18钛合金试样的冲击韧性，并得出标准样 (0.2 cm缺口深度) 的冲击过程曲线，用扫描电镜对试样断口进行观察。结果显示TC18钛合金冲击韧性值随缺口深度的减小而增大，有0.2 cm深度缺口的标准试样冲击韧性值为20.08 J/cm2，即使有0.02 cm深度缺口的试样，其冲击韧性(77.92 J/cm2)也比无缺口试样低很多，无缺口试样冲击时只发生弯曲而未断裂

Abstract:

The microstructure of TC18 titanium alloy was investigated by XRD，SEM and TEM. The impact toughness of the TC18 titanium with different notch depths was tested by instrumented pendulum impact tester, and the curve showing the impact process was gained. The fracture was analyzed by SEM. The results show that the impact toughness decreases as the notch depth increases, and the toughness of the specimen with 0.02 cm notch was much smaller than that with no notch. The specimen with no notch just curves without breaking.