TB6钛合金热变形诱导马氏体转变  

Transformation of deformation-induced martensite in TB6 titanium alloy

作　　者：欧阳德来[1,2] 鲁世强[1] 崔霞[1] 李鑫[1] 黄旭[3] 

机构地区：[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

出　　处：《中国有色金属学报》2010年第12期2307-2312,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展计划资助项目(2007CB613803);国家自然科学基金资助项目(51005112);航空科学基金资助项目(2009ZE56014);江西省自然科学基金资助项目(2008GZC0041);江西省教育厅科技资助项目(GJJ08203)

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。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.

关 键 词：TB6钛合金 形变诱导马氏体 稳定系数 

分 类 号：TB43[一般工业技术]