片層組織TA15鈦合金的熱變形行為及組織球化
發(fā)布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2016-01-06
采用Gleeble?3500型熱模擬試驗機對片層組織TA15鈦合金進行等溫恒應變速率壓縮試驗，研究其在兩相區(qū)860~970 ℃和應變速率0.01~1 s?1范圍內的熱變形行為和組織球化過程。
片層組織TA15鈦合金的熱變形行為及組織球化Hot deformation behavior and microstructure globularization of TA15 with lamellar structure采用Gleeble?3500型熱模擬試驗機對片層組織TA15鈦合金進行等溫恒應變速率壓縮試驗，研究其在兩相區(qū)860~970 ℃和應變速率0.01~1 s?1范圍內的熱變形行為和組織球化過程。結果表明：片層組織TA15合金兩相區(qū)變形應力對溫度和應變速率很敏感，應力峰值高于等軸組織合金變形時的峰值，而且其前后應力的硬化率和軟化率隨著溫度的降低和應變速率的增大而逐漸增大。應變對片層組織球化的影響最顯著，在本實驗條件下，片層組織開始球化的臨界應變?yōu)?.34~0.59，完全球化需要的應變?yōu)?.4~6.8。TA15片層組織兩相區(qū)變形應力的軟化主要原因是片層組織球化和彎折。
The hot deformation behavior and globularization processes of TA15 with lamellar structure were studied in the temperature range of 860?970 ℃ and strain rate range of 0.01?1 s?1?by hot compression tests using Gleeble?3500 thermal simulation testing machine. The results show that deformation stress of TA15 alloy with lamellar structure is sensitive to the temperature and strain rate, and the stress peak is higher than that of alloy with equiaxed structure. Further more, the hardening ratio before stress peak and the softening ratio after stress peak increase with lower temperature and higher strain rate. The strain is the most remarkable factor of hot deformation parameters that affect the globularization process. The critical strain for initiation of globularization is between 0.34 and 0.59, and the strain for full globularization is between 3.4 and 6.8. The globularization and bending of lamellar structure are the main reasons of flow softening.
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