(1. 南昌航空大学 材料科学与工程学院，南昌 330063；
(2. 南京航空航天大学 材料科学与技术学院，南京 210016；
(3. 北京航空材料研究院，北京 100095)
摘 要: 为研究TB6钛合金在β相区热变形后快冷过程中形变诱导马氏体的转变行为，采用圆柱试样在Thermecmaster−Z型热模拟试验机上进行热压缩试验，并计算β相条件下的稳定系数，观察热变形组织，测试材料的物相结构。结果表明：合金β相条件稳定下系数Kβ为1.06，β相处于机械不稳定状态，在β相区热变形后快冷过程中合金存在形变诱导转变斜方马氏体(α″)，β相向斜方马氏体转变时3个点阵方向发生点阵应变为ε1=−7.1%，ε2=7.2%，ε3=1.1%的结果；形变诱导马氏体呈现针状和锯齿状两种形貌，其转变模式是先形成近似平行的细条状或针状主干，后从主干中不断生长成树枝状，且马氏体内部可能存在孪晶。
关键字: TB6钛合金；形变诱导马氏体；稳定系数
（1. School of Material Science and Engineering , Nanchang Hangkong University, Nanchang 330063, China;
2. Institute of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
3. Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:To study the transformation behavior of deformation-induced martensite in Ti-10Al-2Fe-3V(TB6) alloy during rapid cooling after β hot process，the hot compression experiments adopting cylindrical specimens at constant strain rates were carried out on Thermecmaster−Z simulator. The β stable coefficient (Kβ) of this alloy was calculated and the hot deformation microstructure was observed. The results show that the β stable coefficient (Kβ) is 1.06, the β-phase is of thermomechanical unstability, and the transformation of stress induced orthorhombic martensite from β-phase occurs by transformation strains in three principal lattice directions as ε1=−7.1%, ε2=+7.2%, ε3=+1.1% during rapid cooling after β hot process. The martensite which presents two typical morphologies of transition structure needle-type and serrate-type structure nucleates at pre-existing sub-grain boundaries and grows to laths parallelly.
Key words: TB6 titanium alloy; deformation-induced martensite; stable coefficient
