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Ti14合金觸變可鍛性研究
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國(guó)家“973”項(xiàng)目(2007CB613807)；陜西省自然科學(xué)基金(20110474)；金屬材料國(guó)家重點(diǎn)實(shí)驗(yàn)室開放基金(0111201)；國(guó)家自然科學(xué)基金（51201019）


Thixoformability of Ti14 Alloy in Semi-Solid State
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    摘要:

    通過模擬鐓鍛壓縮和模鍛實(shí)驗(yàn)研究Ti14合金半固態(tài)下的觸變鍛造特性，分析了鍛造過程中的組織演變過程，測(cè)定了鍛件的力學(xué)性能，并綜合討論了該合金半固態(tài)下的觸變可鍛性。結(jié)果表明：Ti14合金在半固態(tài)較常規(guī)固相下具有較小的鐓鍛變形抗力；其中，1000到1100 ℃之間觸變鐓鍛變形量可達(dá)70%~85%。半固態(tài)模鍛結(jié)果表明：1000和1050 ℃下，合金在變形量為45%~75%時(shí)表現(xiàn)出良好的可鍛性，鍛件表面無明顯缺陷。分析認(rèn)為：由于液相的協(xié)調(diào)變形機(jī)制，半固態(tài)下觸變模鍛較常規(guī)模鍛，減少了晶界處的應(yīng)力集中，有效降低了合金的變形抗力；同時(shí)，觸變鍛造可以有效細(xì)化晶粒，提高力學(xué)性能，改善合金的成形性

    Abstract:

    The thixoformability of Ti14 was evaluated by upsetting and die forging tests, and the microstructure and mechanical properties of the forgings were also investigated. The results show that low upsetting force and excellent upsettability with the upsetting reduction in height of 70%~85% could be obtained in semi-solid state ranging from 1000 to 1100 °C. Die forging tests also show the excellent workability with a forging ratio of 75% in the temperature range of 1000 to 1050 °C. It is found that the existence of liquid on grain boundary may serve to relax the stress concentrations caused by solid deformation, causes low deformation resistance and finally improves forgeability of the alloy. The microstructure of samples reveals that dynamic recrystallization might occur during thixoforging and the grain refinement is attained, which also benefit in the improvement of the semi-solid formability and mechanical properties of forgings

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陳永楠,張學(xué)敏,魏建鋒,趙永慶. Ti14合金觸變可鍛性研究[J].稀有金屬材料與工程,2013,42(10):2192~2196.[Chen Yongnan, Zhang Xuemin, Wei Jianfeng, Zhao Yongqing. Thixoformability of Ti14 Alloy in Semi-Solid State[J]. Rare Metal Materials and Engineering,2013,42(10):2192~2196.]
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  • 收稿日期:2012-10-19
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