一种新型低成本阻燃钛合金的微观组织与力学性能
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摘要
研究了一种名义成分为Ti-25V-15Cr-5Mo-0.25Si-0.08C的新型低成本阻燃钛合金TF-X。通过三次真空自耗熔炼制备了Φ120 mm铸锭,经包套挤压得到Φ25 mm棒材,观察了铸锭和挤压棒材的微观组织,测试并分析了挤压棒材的室温和高温拉伸性能、热稳定性能、高温抗蠕变性能。结果表明:TF-X合金具有与TF550合金大致相同的微观组织;TF-X合金室温及高温抗拉强度高于TF550合金,并且具有很好的塑性;本实验条件下,TF-X合金的热稳定性能低于TF550合金,熔炼过程中应该严格控制氧含量;TF-X合金在540℃/250 MPa/100 h条件下抗蠕变性能与TF550合金相当,显著高于Ti40合金。
The ingot with 120 mm in diameter of Ti-25V-15Cr-5Mo-0.25Si-0.08C(TF-X) alloy, which is a new type burn resistant titanium alloy with lower cost, was produced by vacuum arc remelting. This ingot was extruded into bars with 25 mm in diameter by sheathed extrusion. The microstructures of the ingot and extrusion bars of TF-X alloy were studied. The tensile and creep properties and thermal stability of extrusion bars of the alloy were tested under different conditions. The results show that microstructures of TF-X alloy are roughly the same as that of TF550 alloy. However, the TF-X alloy has higher strength than TF550 alloy at room and elevated temperatures and shows excellent ductility. Under the present experimental condition, TF-X alloy shows worse thermal stability than TF550 alloy, and thus the oxygen content should be controlled accurately during the process of remelting. In addition, the creep resistance of TF-X alloy is much better than that of Ti40 alloy but equivalent to that of TF550 alloy at 540 °C/250 MPa/100 h.
The ingot with 120 mm in diameter of Ti-25V-15Cr-5Mo-0.25Si-0.08C(TF-X) alloy, which is a new type burn resistant titanium alloy with lower cost, was produced by vacuum arc remelting. This ingot was extruded into bars with 25 mm in diameter by sheathed extrusion. The microstructures of the ingot and extrusion bars of TF-X alloy were studied. The tensile and creep properties and thermal stability of extrusion bars of the alloy were tested under different conditions. The results show that microstructures of TF-X alloy are roughly the same as that of TF550 alloy. However, the TF-X alloy has higher strength than TF550 alloy at room and elevated temperatures and shows excellent ductility. Under the present experimental condition, TF-X alloy shows worse thermal stability than TF550 alloy, and thus the oxygen content should be controlled accurately during the process of remelting. In addition, the creep resistance of TF-X alloy is much better than that of Ti40 alloy but equivalent to that of TF550 alloy at 540 °C/250 MPa/100 h.
引文
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[9]Sun Huanying(孙欢迎),Liu Yian(刘翊安),Zhao Jun(赵军)et al.The Chinese Journal OF Nonferrous Mertals(中国有色金属学报)[J],2017,27(6):1162
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[11]Sun Huanying(孙欢迎),Cao Jingxia(曹京霞),Wang Bao(王宝)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2013,42(11):2351
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[13]Lai Yunjin(赖运金),Zhang Pingxiang(张平祥),Zhang Saifei(张赛飞)et al.Journal of Aeronautical Materials(航空材料学报)[J],2017,37(5):22
[14]Zhu Yanchun(朱艳春),Zeng Weidong(曾卫东),Peng Wenwen(彭雯雯)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2013,42(10):2088
[15]Ma Fanjiao(马凡蛟),Lai Yunjin(赖运金),Xin Shewei(辛社伟)et al.Forging&Stamping Technology(锻压技术)[J],2017,42(5):147
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[17]Lei Liming(雷力明),Huang Xu(黄旭),Wu Xueren(吴学仁)et al.Chinese Journal of Rare Metals(稀有金属)[J],2004,28(1):47
[18]Sun Huanying(孙欢迎).Hot Deformation Behavior of Burn Resistant Titanium Alloy with High Property(高性能阻燃钛合金高温变形行为研究)[D].Beijing:Beijing Institute of Aeronautical Materials,2013
[19]Zhao Yongqing(赵永庆),Zhu Kangying(朱康英),Qu Henglei(曲恒磊)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2003,32(8):610
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