一种新型铸造高温钛合金的开发和性能研究  

Development and Property Research on a New High-temperature Titanium Alloy

作　　者：刘喜波 王非 孙宏喆 徐群 高福洋 李维廷 LIU Xibo;WANG Fei;SUN Hongzhe;XU Qun;GAO Fuyang;LI Weiting(CSSC Luoyang Ship Material Research Institute,Luoyang 471023,China;Luoyang Sunrui Titanium Precision Casting Co.,Ltd.,Luoyang 471023,China)

机构地区：[1]中国船舶集团有限公司第七二五研究所,河南洛阳471023 [2]洛阳双瑞精铸钛业有限公司,河南洛阳471023

出　　处：《铸造技术》2025年第3期271-276,共6页Foundry Technology

基　　金：河南省重大科技专项(3919025001)。

摘　　要：为了满足航天领域高速飞行器650℃以上短时高温需求,开发了新型耐高温Ti700SR铸造钛合金,对比分析了两种成分的合金在不同温度下的力学性能和工艺性能。结果表明,铸造Ti700SR合金具有良好的室温和高温性能,可在650~750℃高温使用。成分含量低的2#合金室温强度和塑性匹配更好,工艺性能良好。2#合金的铸造流动性相当于TC4合金的83%,TIG拘束焊和补焊试板成型良好,在刚性拘束条件下的焊接裂纹倾向不明显,试板对接焊后双面成型良好,焊接系数超过0.9,制备的圆筒型铸件抗裂纹性较好。此外,Ti700SR合金和TA15钛板利用电子束对焊可实现异种钛材结合连接。To meet the short-term high-temperature requirements for high-speed aircraft in the aerospace industry,a new high-temperature Ti700SR cast titanium alloy was developed,and the mechanical properties under different temperatures and technology properties were compared for two kinds of component alloys.The results indicate that the Ti700SR cast alloy has good mechanical properties under room-temperature and high-temperature conditions and can be used in the 650~750℃temperature range.The 2#alloy with the lower component has good matching room temperature strength and plasticity as well as technology properties.The casting fluidity of 2#alloy is equivalent to 83%that of the TC4 alloy.Both TIG restraint welding and repair welding of test plates result in excellent forming quality,with no significant cracking tendency under rigid constraint conditions.The butt-welded joints demonstrate perfect double-sided formation with complete penetration,achieving a welding coefficient exceeding 0.9.Additionally,the cylindrical castings prepared with 2#alloy displays good crack resistance performance.Furthermore,different titanium alloys,namely,Ti700SR and TA15 alloys,can be combined via electron beam welding.

关 键 词：铸造 高温钛合金 工艺性能 组织形貌 焊接 

分 类 号：TG146.2[一般工业技术—材料科学与工程]