【摘要】：基于熱機(jī)械疲勞試驗(yàn),建立IN718高溫合金感應(yīng)加熱過(guò)程中電磁場(chǎng)和溫度場(chǎng)耦合的數(shù)學(xué)模型,對(duì)試樣在循環(huán)加熱條件下的非穩(wěn)態(tài)溫度場(chǎng)進(jìn)行仿真,采用電子背散射衍射技術(shù)對(duì)試樣上的晶粒尺寸進(jìn)行檢測(cè)并對(duì)其數(shù)據(jù)進(jìn)行統(tǒng)計(jì)分析。結(jié)果表明:綜合傳熱系數(shù)和風(fēng)機(jī)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(shí)間變化,最大溫差為5℃左右,符合試驗(yàn)要求;低周疲勞試樣徑向上不同點(diǎn)的平均晶粒尺寸均有所增長(zhǎng),且增長(zhǎng)幅度基本相同;由于溫度梯度的影響,熱機(jī)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(zhǎng)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(hào)：2435986