将尖切口强度理论用于ZTi6A14V铸造钛合金损伤容限性能的评价,探讨了不同退火温度对其三点弯曲断裂韧度KQ的影响.结果表明:尖切口试样测定的断裂韧度KQ1不等同于标准试验方法测定的KQ,但可用于铸造钛合金不同工艺间断裂韧度的比较.退火温度的改变可微调ZTi6Al4V铸造钛合金的强度和断裂韧度,在700℃或820℃保温2h退火处理,试样的断裂韧度较好,KQ.值分别达到78.11MPa·m1/2和79.44MPa·m1/2,屈服强度分别为782.74MPa和771.49MPa,抗拉强度分别为860.18MPa和853.0MPa,伸长率达8.10％和7.46％,获得了较好的强塑性匹配.
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