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噴射成形FGH95高溫變形流變應(yīng)力行為與預(yù)測(cè)
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更新時(shí)間：2015-10-24
在變形溫度為1 050~1 140 ℃、應(yīng)變速率為0.01~10 s?1和變形率為50%的條件下，采用Gleeble?1500熱模擬機(jī)研究噴射成形FGH95合金的熱壓縮變形行為。
噴射成形FGH95高溫變形流變應(yīng)力行為與預(yù)測(cè)Flow stress behavior and prediction of spray-forming FGH95 superalloy at elevated temperature
在變形溫度為1 050~1 140 ℃、應(yīng)變速率為0.01~10 s?1和變形率為50%的條件下，采用Gleeble?1500熱模擬機(jī)研究噴射成形FGH95合金的熱壓縮變形行為。結(jié)果表明：在合金熱壓縮變形初始階段，流變應(yīng)力隨應(yīng)變的增加迅速增大，達(dá)到峰值應(yīng)力后逐漸減小，呈現(xiàn)明顯的動(dòng)態(tài)軟化特征；合金流變應(yīng)力隨變形溫度的升高和應(yīng)變速率的降低而顯著減?。粦?yīng)變速率為0.1~10 s?1時(shí)，合金峰值應(yīng)變隨溫度升高而減小，并趨于平穩(wěn)；而應(yīng)變速率為0.01 s?1時(shí)，合金峰值應(yīng)變?cè)? 100 ℃出現(xiàn)極大值?？紤]變形量對(duì)合金熱壓縮流變行為的影響，引入包含應(yīng)變量的四次多項(xiàng)式函數(shù)對(duì)雙曲正弦修正的Arrhenius方程進(jìn)行改進(jìn)，改進(jìn)后的本構(gòu)方程的流變應(yīng)力預(yù)測(cè)值與實(shí)驗(yàn)值吻合較好，平均相對(duì)誤差為3.64%。
In order to study the workability and establish the flow stress constitutive equation for spray-forming FGH95 superalloy, the hot compressive deformation behavior of the superalloy was investigated on Gleeble?1500 thermal simulator at the temperature range from 1 050 ℃ to 1 140 ℃, strain rate range from 0.01 to 10 s?1?and deformation rate of 50%. The results show that, during the hot compression deformation of spray-forming FGH95 superalloy, the flow stress increases quickly with the strain increasing and then reaches a peak, then decreases to steady value, and the characteristics of dynamic softening are observed. The flow stress of superalloy significantly decreases with the temperature increasing and the strain rate decreasing. The peak strain of superalloy reduces with the temperature increasing, and gradually stabilizing in strain rate range from 0.1 s?1?to 10 s?1. However, the peak strain of superalloy reaches maximum value at strain rate of 0.01 s?1?and at 1 100 ℃.Considering the impact of deformation on the flow behavior, modified Arrhenius equation of hyperbolic sine was improved by introducing 4th order polynomial function of strain. The predicted flow stress by the developed constitutive equation agrees well with the experimental results, and the average relative error is 3.64%.
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