s+β組織及再結(jié)晶等軸α晶粒的含量隨熱軋溫度升高而增加。(2)熱軋Ti-6AL-4V合金中的織構(gòu)隨熱軋溫度變化而改變,但α晶粒的<0001>方向始終平行于軋板的法向。(3)熱軋Ti-6AL-4V合金的動態(tài)力學(xué)性能具有明顯的各向異性,且各向異性規(guī)律隨熱軋溫度的變化而改變。(4)隨著熱軋溫度的升高,沿法向加載時,合金的動態(tài)流變應(yīng)力不斷減小,絕熱剪切臨界失效應(yīng)變不斷增大;沿軋向加載時,合金的動態(tài)流變應(yīng)力基本保持不變,但臨界失效應(yīng)變明顯降低;沿橫向加載時,合金的動態(tài)力學(xué)性能在840℃到900℃的熱軋溫度范圍內(nèi)基本保持不變,但當(dāng)熱軋溫度為930℃時,合金的動態(tài)流變應(yīng)力明顯升高,臨界失效應(yīng)變明顯降低。"/>

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熱軋溫度對Ti-6AL-4V合金組織及動態(tài)力學(xué)性能的影響研究
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北京理工大學(xué) 材料學(xué)院,北京理工大學(xué)材料學(xué)院,北京理工大學(xué)材料學(xué)院,北京理工大學(xué)材料學(xué)院

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國家自然科學(xué)基金項目(面上項目,重點項目,重大項目)


Effect of hot-rolling temperature on microstructure and dynamic mechanical properties of Ti–6Al–4V
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    摘要:

    在840℃,870℃, 900℃和930℃條件下分別對等軸Ti-6AL-4V合金進(jìn)行總變形量為78%的熱軋,隨后對熱軋Ti-6AL-4V合金的顯微組織形貌、織構(gòu)及動態(tài)力學(xué)性能進(jìn)行研究。結(jié)果表明,(1)當(dāng)熱軋溫度達(dá)到900℃以上時,TI-6AL-4V合金中才發(fā)生再結(jié)晶及相變,顯微組織類型由等軸組織變?yōu)殡p態(tài)組織,αs+β組織及再結(jié)晶等軸α晶粒的含量隨熱軋溫度升高而增加。(2)熱軋Ti-6AL-4V合金中的織構(gòu)隨熱軋溫度變化而改變,但α晶粒的<0001>方向始終平行于軋板的法向。(3)熱軋Ti-6AL-4V合金的動態(tài)力學(xué)性能具有明顯的各向異性,且各向異性規(guī)律隨熱軋溫度的變化而改變。(4)隨著熱軋溫度的升高,沿法向加載時,合金的動態(tài)流變應(yīng)力不斷減小,絕熱剪切臨界失效應(yīng)變不斷增大;沿軋向加載時,合金的動態(tài)流變應(yīng)力基本保持不變,但臨界失效應(yīng)變明顯降低;沿橫向加載時,合金的動態(tài)力學(xué)性能在840℃到900℃的熱軋溫度范圍內(nèi)基本保持不變,但當(dāng)熱軋溫度為930℃時,合金的動態(tài)流變應(yīng)力明顯升高,臨界失效應(yīng)變明顯降低。

    Abstract:

    The equiaxed Ti-6Al-4V alloys were rolled with an overall reduction ratio of 0.78 at 840℃, 870℃, 900℃ and 930℃, respectively. The microstructure, texture and anisotropy of dynamic mechanical properties of the rolled alloy were investigated. Results have shown that, recrystallization and phase transformation did not occur until the rolling was performed at a temperature higher than 900℃, and then the microstructure of the rolled alloy turned into bimodal, while the amount of lamellar αs+β structure and recrystallized α grains showed an increasing tendency with the increased rolling temperature. Moreover, it was interesting to find that although the texture was varying with the rolling temperature, the <0001> direction of α phase kept parallel to the normal direction (ND) during the hot-rolling process at various temperatures. Based on the analyses of dynamic mechanical properties, Ti-6Al-4V alloy was observed to exhibit anisotropy of dynamic mechanical properties after hot-rolling at different temperature. However, resulting from the rolling-temperature-depended texture and distribution of dislocation, the anisotropic tendency of dynamic mechanical properties varied with the rolling temperature. Moreover, with the increased rolling temperature, the dynamic flow stress loaded along ND decreased, while the adiabatic shearing failure strain slightly increased. The dynamic flow stress loaded along RD remained constant, while the adiabatic shearing failure strain exhibited an obviously decreasing tendency with the increased rolling temperature. The dynamic mechanical properties loaded along Transverse Direction (TD) remained constant when the rolling temperature was in the range of 840℃ to 900℃, while the dynamic flow stress loaded along TD increased evidently when the rolling temperature reaches 930℃, but the adiabatic shearing failure strain decreased greatly.

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駱雨萌,劉金旭,李樹奎,程興旺.熱軋溫度對Ti-6AL-4V合金組織及動態(tài)力學(xué)性能的影響研究[J].稀有金屬材料與工程,2018,47(5):1333~1340.[Luo Yumeng, Liu Jinxu, Li Shukui, Cheng Xingwang. Effect of hot-rolling temperature on microstructure and dynamic mechanical properties of Ti–6Al–4V[J]. Rare Metal Materials and Engineering,2018,47(5):1333~1340.]
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  • 收稿日期:2016-01-30
  • 最后修改日期:2016-06-01
  • 錄用日期:2017-04-13
  • 在線發(fā)布日期: 2018-06-08
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