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BT25鈦合金在兩相區(qū)變形過程中的顯微組織定量分析
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更新時間：2015-08-21
對具有片層α相的BT25合金圓餅在兩相區(qū)進行4種變形程度的等溫鍛造，用定量金相分析方法研究變形量對顯微組織特征參數(α相體積分數、α片層厚度和α相球化率)的影響規(guī)律。
BT25鈦合金在兩相區(qū)變形過程中的顯微組織定量分析Quantitative metallography analysis of microstructure of
BT25 titanium alloy deformed in two-phase field
對具有片層α相的BT25合金圓餅在兩相區(qū)進行4種變形程度的等溫鍛造，用定量金相分析方法研究變形量對顯微組織特征參數(α相體積分數、α片層厚度和α相球化率)的影響規(guī)律。結果表明：隨著變形量增加，α片層不斷彎曲破碎，導致α片層長寬比減小而球化率增大，當變形量達到80%時球化率為85.23%，改善了合金組織的均勻性；在變形過程中片層α兩端的物質向中間擴散，導致片層厚度增加，變形量從0%增至80%，α片層厚度增加了1.6
μm；α相的體積分數由于等溫鍛造溫度不變而基本維持在60%左右，大變形時有所降低。
The isothermal compression of BT25 titanium alloy with
initial lamellar was carried out with four deformation degrees and the effect of
deformation degree on microstructure parameters (volume fraction, thickness and
globularization ratio of α phase) was investigated based on quantitative
metallography. The results show that the process of α lamellar
pinch-off/fragmentation takes place with increasing the deformation degree,
which results in the decrease of the Feret ratio of α lamellar and the increase
of globularization ratio. It reaches 85.23% when the deformation degree is 80%.
The microstructure homogeneity of the alloy is improved. Mass diffusion from
both ends of α lamellar to center happens during the deformation process, making
the thickness of α phase increase (about 1.6 μm with increasing deformation
degree from 0% to 80%). The volume fraction of α phase (about 60%) remains
unchanged because of a stable deformation temperature. However, it decreases
slightly in the case of high forging strains.
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