摘要
对BT22合金在不同热加工区塑性变形后,分别进行空冷、油冷、水冷以及炉冷的热处理,随后进行室温力学性能测试。用金相显微镜和扫描电镜分别观测它们的组织结构和断口形貌。结果表明,合金的淬透性受冷却速度的影响很小。晶内组织细小,拉伸断口均呈现韧性断裂。合金的力学性能与α、β稳定合金化元素所决定的铝当量([Al]eq)和钼当量([Mo]eq)有关,当合金的铝当量和钼当量具有较好的匹配时,合金在具有较高的模量强化强度的同时,合金的淬透性能也较好。比较TC4和BT22合金的[Al]eq,[MO]eq数据可见,BT22合金的[Al]eq稍有降低,但[MO]eq则有较大提高,使其与TC4合金相比虽然模量强度有所损失,但在淬透深度增加的情况下,固溶强度大大提高,弥补了由于铝当量的稍低带来的强度减少。
The Samples of BT22 are treated through air, oil and furnace cooling after heat deformation at different temperature respectively. The results show the quenching degree is hardly affected by the cooling rate, and possesses a better microstructure, the tensile fracture appears a toughness. The properties of alloys are subject to the metallurgical aluminum and molybdenum equivalance. As the better match between aluminum and molybdenum equivalance in alloy, the alloy holds not only the better modular strength but also the significant quenching degree. Compare the aluminum and molybdenum equivalance with Ti-6Al--4V alloy, the one is higher than that of Ti-6Al-4V, and results in increasing the quenching degree greatly.
出处
《稀有金属快报》
CSCD
2006年第6期21-26,共6页
Rare Metals Letters
关键词
BT22钛合金
组织
性能
铝当量
钼当量
BT22 titanium alloy
quenching property
molybdenum equivalence, aluminum equivalence
microstructure
property
