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Predicting long-term creep-rupture property of Inconel 740 and 740H

机译:预测Inconel 740和740H的长期蠕变断裂性能

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The prediction of long-term creep-rupture strength values for Inconel 740 and 740H is made at temperatures ranging from 650 degrees C to 850 degrees C by using Larson-Miller (LM) and Manson-Haferd (MH) methodologies. Then, the predicted creep-rupture strength values are compared with the ones reported by Wilshire-Scharning (WS) model, a new approach for life assessment. The results show that the LM method is easy to cause either underestimation or overestimation of long-term properties depending on the selected data. Compared with the LM and WS methods, predictions produced by MH method have a relatively good consistency with the experimental data over 30 000 h, and the 105 hours creep-rupture strength extrapolated from rupture life of 5000 h or more than 30 000 h are almost same. This suggests that the MH method is a better method for predicting the long-term creep-rupture strength of Inconel 740 and 740H alloys.
机译:Inconel 740和740H的长期蠕变断裂强度值的预测是通过使用Larson-Miller(LM)和Manson-Haferd(MH)方法在650摄氏度至850摄氏度的温度范围内进行的。然后,将预测的蠕变断裂强度值与寿命评估的新方法Wilshire-Scharning(WS)模型报告的值进行比较。结果表明,LM方法很容易导致长期特性的低估或高估,具体取决于所选数据。与LM和WS方法相比,MH方法得出的预测值与30 000 h以上的实验数据具有较好的一致性,从5000 h或30 000 h以上的断裂寿命推断出的105 h蠕变断裂强度几乎是相同。这表明MH方法是预测Inconel 740和740H合金的长期蠕变断裂强度的更好方法。

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