【摘要】：基于熱機械疲勞試驗,建立IN718高溫合金感應(yīng)加熱過程中電磁場和溫度場耦合的數(shù)學模型,對試樣在循環(huán)加熱條件下的非穩(wěn)態(tài)溫度場進行仿真,采用電子背散射衍射技術(shù)對試樣上的晶粒尺寸進行檢測并對其數(shù)據(jù)進行統(tǒng)計分析。結(jié)果表明:綜合傳熱系數(shù)和風機電壓呈正相關(guān)的關(guān)系;試樣徑向上存在溫度梯度且隨時間變化,最大溫差為5℃左右,符合試驗要求;低周疲勞試樣徑向上不同點的平均晶粒尺寸均有所增長,且增長幅度基本相同;由于溫度梯度的影響,熱機械疲勞試樣徑向上的晶粒尺寸分布不均勻,中心位置和表面位置的平均晶粒尺寸增長幅度分別為16.94%和5.3%。
[Abstract]:Based on the thermo-mechanical fatigue test, a mathematical model of coupling electromagnetic field and temperature field during induction heating of IN718 superalloy is established, and the unsteady temperature field of the specimen under cyclic heating is simulated. The grain size on the sample was measured by electron backscattering diffraction and the data were analyzed statistically. The results show that there is a positive correlation between the comprehensive heat transfer coefficient and the fan voltage, the temperature gradient exists in the radial direction of the test sample and changes with time, and the maximum temperature difference is about 5 鈩，

本文編號：2435986