一种新型低成本阻燃钛合金的微观组织与力学性能  

Microstructure and Mechanical Properties of a New Type Burn Resistant Titanium Alloy with Lower Cost

作　　者：孙欢迎 赵军[1] 刘翊安 张泉 曹京霞 黄旭[2] Sun Huanying;Zhao Jun;Liu Yian;Zhang Quan;Cao Jingxia;Huang Xu(North China Institute of Aerospace Engineering, Langfang 065000,China;Beijing Institute of Aeronautical Materials, Beijing 100095,China)

机构地区：[1]北华航天工业学院,河北廊坊065000 [2]北京航空材料研究院,北京100095

出　　处：《稀有金属材料与工程》2019年第6期1892-1896,共5页Rare Metal Materials and Engineering

基　　金：河北省高等学校科学技术研究重点项目(ZD2018239);北华航天工业学院科研基金重点项目(ZD-2016-03)

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.

关 键 词：阻燃钛合金 低成本 微观组织 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]