變形歷程對TA15鈦合金等溫局部近β鍛微觀組織的影響
發布人:上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間:2016-01-23
通過熱模擬壓縮實驗研究了TA15鈦合金多火次等溫局部鍛造微觀組織演化行為,并采用圖形分析軟件對實驗所得金相照片進行分析,揭示了兩相區鍛造階段的火次、近β鍛的變形量、各加載工步之間以及終鍛后坯料的冷卻方式等變形歷程對TA15鈦合金等溫局部近β鍛微觀組織演化的影響。
變形歷程對TA15鈦合金等溫局部近β鍛微觀組織的影響Effects of processing history on microstructure of TA15 alloys?during isothermal local loading near β forging通過熱模擬壓縮實驗研究了TA15鈦合金多火次等溫局部鍛造微觀組織演化行為,并采用圖形分析軟件對實驗所得金相照片進行分析,揭示了兩相區鍛造階段的火次、近β鍛的變形量、各加載工步之間以及終鍛后坯料的冷卻方式等變形歷程對TA15鈦合金等溫局部近β鍛微觀組織演化的影響。結果表明:先變形區等軸α晶粒尺寸和含量均大于后變形區的;隨著變形道次的增加,初生α晶粒的方向性逐步減弱;當總變形道次(常規鍛+近β鍛)達到3次時,有粗大的次生α相析出;近β鍛階段變形量達到40%時,后變形區等軸α晶粒消失,在原來等軸α晶粒存在的位置有粗大、成簇的次生α相析出;工序間和鍛后水冷,較采取空冷方式時,等軸α晶粒更少、更小,次生α相更為混亂交織。研究結果可為合理制定TA15鈦合金大型復雜整體構件等溫條件下的多火次局部鍛造成形工藝提供依據。
The microstructure of TA15 titanium alloy during isothermal local loading near β forging through isothermal compression was studied, and then the effects of forging fires, deformation of near β forging and cooling method on microstructure transform were investigated through metallograhs analysis by using image analysis software. The results show that the content of equiaxed α grains in the first deformation region is more than that in the second deformation region, and the size of equiaxed α grains is larger. The orientation of prime alpha grains decreases gradually with the increase of forging fires. When the total number of forging fires (ordinary forging + near β forging) reaches three, coarse secondary α-phase precipitates. When the deformation of near β forging reaches 40%, the equiaxed α grains are almost instead of cluster coarse secondary α-phase grains in the second deformation region. When water cool method is adopted between the forging step and after deformation, the size of equiaxed α grains is fewer and smaller, besides, the secondary α-phase grains are more disordered. The results obtained can provide a guide for isothermal local loading of large-scale complex integral components of TA15 titanium alloy.
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