新聞資訊
Ti-5Al-5Mo-5V-1Cr-1Fe合金的高溫塑性變形行為
發(fā)布人：上海艾荔艾金屬材料有限公司bt990.com.cn
更新時(shí)間：2015-10-17
在Gleeble-1500 熱模擬機(jī)上對(duì)Ti-5Al-5Mo-5V-1Cr-1Fe合金進(jìn)行高溫?zé)釅嚎s實(shí)驗(yàn)，研究該合金在變形溫度為750~900 ℃、應(yīng)變速率為0.001~1 s?1 條件下的流變應(yīng)力行為。利用光學(xué)顯微鏡分析合金在不同變形條件下的組織演化規(guī)律。
Ti-5Al-5Mo-5V-1Cr-1Fe合金的高溫塑性變形行為Plastic deformation behavior of Ti-5Al-5Mo-5V-1Cr-1Fe alloy at high temperature
在Gleeble-1500 熱模擬機(jī)上對(duì)Ti-5Al-5Mo-5V-1Cr-1Fe合金進(jìn)行高溫?zé)釅嚎s實(shí)驗(yàn)，研究該合金在變形溫度為750~900 ℃、應(yīng)變速率為0.001~1 s?1?條件下的流變應(yīng)力行為。利用光學(xué)顯微鏡分析合金在不同變形條件下的組織演化規(guī)律。結(jié)果表明：合金的流變應(yīng)力隨著應(yīng)變速率的增大和變形溫度的降低而增大；流變應(yīng)力隨著應(yīng)變的增加而增大，出現(xiàn)峰值后逐漸趨于平穩(wěn)；變形過(guò)程中的流變應(yīng)力可用Arrhenius雙曲正弦本構(gòu)關(guān)系來(lái)描述，平均變形激活能為454.2 kJ/mol；各種變形條件均可細(xì)化原始晶粒尺寸。隨著溫度的升高和應(yīng)變速率的降低，合金的主要軟化機(jī)制由動(dòng)態(tài)回復(fù)逐漸變?yōu)閯?dòng)態(tài)再結(jié)晶；在(α+β)相區(qū)變形(750~850 ℃)時(shí)，α相對(duì)β晶粒的動(dòng)態(tài)再結(jié)晶的發(fā)生起到阻礙作用。
The hot deformation behaviors of Ti-5Al-5Mo-5V-1Cr-1Fe alloy were studied by a Gleeble-1500 machine at 750?900 ℃ with the strain rate of 0.001?1 s?1. The microstructural evolution of the alloy was investigated by optical microscopy. The results indicate that the flow stress of the alloy increases with increasing strain rate and decreasing deformation temperature. The flow stress increases with increasing strain until the stress reaches the peak value, then the flow stress remains constant. The flow stress in deformation can be described by Arrhenius hyperbolic sine constitutive equation, and the average activation energy is 454.2 kJ/mol. The original grain size can be refined under all deformation conditions. The main softening mechanism is changed from dynamic recovery to dynamic recrystallization with increasing the deformation temperature and decreasing the strain rate. In the (α+β) region (750?850 ℃), α phase can inhibit the dynamic recrystallization of β grains particles during deformation.
以上資料由上海艾荔艾金屬材料有限公司提供，歡迎新老客戶來(lái)電洽購(gòu)。
本文來(lái)自上海艾荔艾金屬材料有限公司http://bt990.com.cn，轉(zhuǎn)載請(qǐng)注明出處。