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鑄態(tài)阻燃鈦合金的熱加工圖與變形機(jī)制研究
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Hot Processing Map and Deformation Mechanism of as-Cast Burn Resistant Titanium Alloy
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    摘要:

    在熱模擬試驗機(jī)上對鑄態(tài)組織的阻燃鈦合金（Ti-35V-15Cr-Si-C）進(jìn)行了等溫恒應(yīng)變速率熱壓縮試驗，溫度范圍為900~1200 ℃，應(yīng)變速率范圍為10-3~1 s-1，測試了其真應(yīng)力-真應(yīng)變曲線并對曲線上的應(yīng)力σ突降進(jìn)行了解釋?；趧討B(tài)材料模型建立了合金的熱加工圖，結(jié)合微觀組織觀察，確定了3個不同區(qū)域的高溫變形機(jī)制：溫度900~1030 ℃、應(yīng)變速率小于0.1 s-1時，變形機(jī)制為動態(tài)回復(fù)和連續(xù)動態(tài)再結(jié)晶；溫度大于1030 ℃、應(yīng)變速率小于0.1 s-1時，功率耗散效率η出現(xiàn)峰值，除了動態(tài)回復(fù)和連續(xù)動態(tài)再結(jié)晶，還出現(xiàn)碳化物溶解現(xiàn)象；高應(yīng)變速率（大致在0.01~1 s-1之間）區(qū)，是合金的變形失穩(wěn)區(qū)域，較低溫度時失穩(wěn)機(jī)制為局部流動，高溫失穩(wěn)與碳化物溶解有關(guān)，=1 s-1時組織演變特征是項鏈狀動態(tài)再結(jié)晶

    Abstract:

    Hot compressive deformation tests of as-cast burn resistant titanium alloy (Ti-35V-15Cr-Si-C) were performed on the Gleeble-1500 simulator in the temperature range of 900~1200 °C, over the range of strain rate from 10-3 s-1 to 1 s-1. The compressive true stress vs. true strain curves were measured. The discontinuous yielding phenomenon was explained. The hot processing maps developed on the basis of dynamic material model (DMM) exhibits the following three domains. The alloy dynamic recovery and continuous recrystallization in the temperature range from 900 °C to 1030 °C and at lower strain rate (＜0.1 s-1). A peak power dissipation efficiency area of 50%~65% occurring at higher temperature (≥1030 °C) and lower strain rate. In addition to dynamic recovery and continuous recrystallization, the carbide solution phenomenon is observed. The alloy exhibits a wide region of flow instability manifested by flow localization and carbide solution at higher strain rate. The ‘Necklace’ dynamic recrystallization occurs at the strain rate of 1 s-1

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孫歡迎,曹京霞,王 寶,黃 旭,曹春曉.鑄態(tài)阻燃鈦合金的熱加工圖與變形機(jī)制研究[J].稀有金屬材料與工程,2013,42(12):2541~2546.[Sun Huanying, Cao Jingxia, Wang Bao, Huang Xu, Cao Chunxiao. Hot Processing Map and Deformation Mechanism of as-Cast Burn Resistant Titanium Alloy[J]. Rare Metal Materials and Engineering,2013,42(12):2541~2546.]
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  • 收稿日期:2012-12-10
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