航空航天业的发展对高强度、高断裂韧性的新型钛合金的需求越来越迫切,研究具有自主知识产权并用于航空大型结构件的新型高强高韧钛合金得到世界各国的重视.综合评述了国外传统的Ti-1023、BT22合金、β-21S合金、β-C合金,新型Timetal555和VST55531合金以及我国的TB2和TB10合金等7种高强高韧钛合金研究及应用现状,分析了合金的成分、组织、强度、塑性、断裂韧性等特点.根据国内外高强高韧钛合金发展现状,提出发展方向:研制Rm≥1300 MPa,K(IC)≥55 Pa·m(1/2)新型高强韧钛合金;新型合金成分应以Ti-Al-Mo-V-Cr系为主;探索加工工艺与高强高韧钛合金合金组织及性能的关系;发展具有优异的淬透性及良好的锻造性能为主的大型锻件用高强高韧钛合金.
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