本文選題：鈦合金　切入點(diǎn)：高溫成形　出處：《材料科學(xué)與工藝》2015年03期 　論文類(lèi)型：期刊論文

【摘要】：為了更準(zhǔn)確地描述鈦合金的高溫變形行為,對(duì)Arrhennius方程進(jìn)行修正得到鈦合金高溫本構(gòu)方程.通過(guò)對(duì)一種新型鈦合金在熱模擬試驗(yàn)機(jī)上進(jìn)行恒應(yīng)變速率等溫壓縮實(shí)驗(yàn),研究其在700~1 000℃、應(yīng)變速率0.01~10 s-1條件下的熱變形行為,分析了材料的真實(shí)應(yīng)力-真實(shí)應(yīng)變曲線.采用最小二乘擬合的數(shù)據(jù)回歸處理,得到該鈦合金在α+β雙相區(qū)和β單相區(qū)的熱變形激活能,并通過(guò)引入溫度變量,獲得了Arrhennius方程參數(shù)A隨溫度變化的函數(shù)關(guān)系,建立了該材料的高溫流變應(yīng)力本構(gòu)方程.實(shí)驗(yàn)結(jié)果表明,隨著變形增加,流變應(yīng)力開(kāi)始急劇增加,隨后出現(xiàn)軟化并趨于穩(wěn)態(tài),同時(shí)峰值應(yīng)力對(duì)于溫度和應(yīng)變速率具有很強(qiáng)的敏感性.通過(guò)在Arrhenius方程中引入溫度變量,有利于提高本構(gòu)方程的準(zhǔn)確性.
[Abstract]:In order to describe the deformation behavior of titanium alloy at high temperature more accurately, the high temperature constitutive equation of titanium alloy was obtained by modifying the Arrhennius equation. The constant strain rate isothermal compression experiment of a new titanium alloy was carried out on a thermal simulation machine. The thermal deformation behavior of the material was studied at 700 鈩，

本文編號(hào)：1628957