新聞資訊
Ti40合金熱加工保溫過程中的組織演化
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更新時間：2015-09-13
針對Ti40合金大規(guī)格棒材鍛造過程中的組織演化行為，在棒材鍛造的不同階段取樣，對樣品進(jìn)行不同溫度和不同時間的加熱和保溫，通過光學(xué)顯微鏡和EBSD測試對合金組織演化行為和再結(jié)晶機(jī)制進(jìn)行分析。
Ti40合金熱加工保溫過程中的組織演化Microstructure evolution of Ti40 alloy during hot working process
針對Ti40合金大規(guī)格棒材鍛造過程中的組織演化行為，在棒材鍛造的不同階段取樣，對樣品進(jìn)行不同溫度和不同時間的加熱和保溫，通過光學(xué)顯微鏡和EBSD測試對合金組織演化行為和再結(jié)晶機(jī)制進(jìn)行分析。結(jié)果表明：Ti40合金棒材在加熱保溫過程中主要以晶界小晶粒長大為主，這些晶界小晶粒主要產(chǎn)生于鍛造過程中，是依靠晶界變形從原始母晶粒上脫落產(chǎn)生的，這些晶粒在此后的棒材加熱保溫過程中長大，引起合金的組織均勻化和細(xì)化。從組織均勻性和晶粒平均尺寸考慮，合金最佳的加熱工藝為1 000 ℃、4 h。
Aiming at the microstructure evolution of Ti40 big bar, the samples cut from bar blanks with different deformation were heated at different temperatures for different times. Optical microscope and EBSD were used to analyze the microstructure evolution and recrystallization behavior. The results indicate that the microstructure evolution of Ti40 bar during heated process mainly shows the growing behavior of small grains along grain boundaries. These small grains mainly results from forging process, which mainly come from original parent grains because of the grain boundaries deformation. After forging process, these small grains grow during heating process and which cause the uniform microstructure and the decrease of the average grain size. In view of the average grain size and microstructure uniformity, the best heating process is (1 000 ℃, 4 h).
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