Ti25V15Cr0.3Si合金含有40%左右的合金元素.是一种高固溶强化的β钛合金.测试了Ti25V15Cr0.3Si合金在室温(25℃)至600℃下的裂纹扩展性能,发现随着温度升高,裂纹扩展速率增大.与Ti6Al4V和β21S合金相比,室温下Ti25V15Cr0.3Si合金的裂纹扩展速率高于Ti6Al4V而低于β21S合金.600℃高温下,Ti25V15Cr0.3Si合金的裂纹扩展速率与β21S在650℃时的水平相当.研究结果表明,合金的屈服强度、弹性模量、断裂韧性、氧化性能和组织结构特征综合影响着Ti25V15Cr0.3Si合金的裂纹扩展损伤行为.从室温到300℃,随温度的升高,Ti25V15Cr0.3Si合金的屈服强度和弹性模量降低同时断裂韧性升高,因此裂纹扩展速率变化不明显;而从500-600℃,温度升高氧化加剧,合金疲劳裂纹扩展速率明显增加.与Ti6Al4V合金相比,室温下,Ti25V15Cr0.3Si合金相对于Ti6Al4V合金具有较低的弹性模量以及等轴的β组织,裂纹扩展速率较高.而与β21S合金相比,Ti25V15Cr0.3Si合金的屈服强度和弹性模量高于β21S合金,因此裂纹扩展速率较低.600℃高温下,Ti25V15Cr0.3Si合金的氧化程度明显高于β21S合金.高温下材料的氧化使得Ti25V15Cr0.3Si合金的裂纹扩展速率只与β21S在650℃时的水平相当.
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