TB6鈦合金熱變形誘導馬氏體轉變
發布人:上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間:2015-12-26
為研究TB6鈦合金在β相區熱變形后快冷過程中形變誘導馬氏體的轉變行為,采用圓柱試樣在Thermecmaster?Z型熱模擬試驗機上進行熱壓縮試驗,并計算β相條件下的穩定系數,觀察熱變形組織,測試材料的物相結構。
TB6鈦合金熱變形誘導馬氏體轉變Transformation of deformation-induced martensite in TB6 titanium alloy
為研究TB6鈦合金在β相區熱變形后快冷過程中形變誘導馬氏體的轉變行為,采用圓柱試樣在Thermecmaster?Z型熱模擬試驗機上進行熱壓縮試驗,并計算β相條件下的穩定系數,觀察熱變形組織,測試材料的物相結構。結果表明:合金β相條件穩定下系數Kβ為1.06,β相處于機械不穩定狀態,在β相區熱變形后快冷過程中合金存在形變誘導轉變斜方馬氏體(α″),β相向斜方馬氏體轉變時3個點陣方向發生點陣應變為ε1=?7.1%,ε2=7.2%,ε3=1.1%的結果;形變誘導馬氏體呈現針狀和鋸齒狀兩種形貌,其轉變模式是先形成近似平行的細條狀或針狀主干,后從主干中不斷生長成樹枝狀,且馬氏體內部可能存在孿晶。
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.
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