本文選題：XA合金 + 等溫壓縮��； 參考：《稀有金屬材料與工程》2017年01期

【摘要】：采用Gleeble-3500熱模擬試驗(yàn)機(jī)對(duì)X2A66合金進(jìn)行等溫?zé)釅嚎s實(shí)驗(yàn),變形溫度為623.15~743.15 K、應(yīng)變速率為0.001~10 s~(-1),并利用雙曲正弦函數(shù)和動(dòng)態(tài)材料模型,建立合金峰值應(yīng)力的本構(gòu)方程和加工圖。結(jié)果表明:X2A66合金的流變應(yīng)力隨溫度的升高而減小,隨應(yīng)變速率的增加而增大;X2A66合金的溫度敏感性不受應(yīng)變速率的影響,高應(yīng)變速率(應(yīng)變速率高于0.1 s~(-1))時(shí)的速率敏感性高于低應(yīng)變速率時(shí)的速率敏感性。X2A66合金等溫壓縮時(shí)峰值流變應(yīng)力和應(yīng)變速率之間滿足雙曲正弦函數(shù)關(guān)系,其本構(gòu)方程為:e(5)=5.09×10~9[sinh(0.019σ)]~(4.54414)exp( 145.377/RT)。在實(shí)驗(yàn)工藝參數(shù)范圍內(nèi),X2A66合金的失穩(wěn)區(qū)集中在高應(yīng)變速率區(qū),當(dāng)應(yīng)變速率為0.01~0.3 s~(-1),溫度為700~743 K時(shí)是耗散效率的峰值區(qū)域,也是X2A66合金最佳的熱加工工藝區(qū)。
[Abstract]:The isothermal compression test of X2A66 alloy was carried out by using Gleeble-3500 thermal simulation machine. The deformation temperature was 623.15 ~ 743. 15 K and the strain rate was 0.001 ~ 10 s-1 ~ (-1). The constitutive equation and processing diagram of peak stress of X2A66 alloy were established by using hyperbolic sinusoidal function and dynamic material model. The results show that the flow stress decreases with the increase of temperature, and the temperature sensitivity of X2A66 alloy increases with the increase of strain rate. The rate sensitivity at high strain rate (strain rate higher than 0.1 s-1) is higher than that at low strain rate. The relationship between the peak rheological stress and strain rate of X2A66 alloy during isothermal compression satisfies the hyperbolic sinusoidal function. The constitutive equation of the strain rate is as follows: 1. The strain rate is 5.09 脳 10 ~ (9) [sinh(0.019 蟽]. The instability region of X2A66 alloy is concentrated in the high strain rate region in the range of experimental technological parameters. When the strain rate is 0.01 ~ 0. 3 s-1 ~ (-1) and the temperature is 700 ~ 743 K, it is the peak region of dissipation efficiency and the best hot working process area for X2A66 alloy.
【作者單位】： 北京工業(yè)大學(xué);北京航空材料研究院;
【基金】：國(guó)家自然科學(xué)基金(E041501)
【分類(lèi)號(hào)】：TG146.21

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