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材料工程  2009 

Manson-Haferd常数的选择及在蠕变持久寿命预测中的应用

, PP. 30-34

Keywords: 蠕变断裂,持久强度,寿命预测,耐热钢

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Abstract:

对用于蠕变持久寿命预测的Manson-Haferd方法和Larson-Miller方法的对比分析表明在Larson-Miller参数模型中,依据实验数据得到的常数C的波动,对预测结果影响较大;而在Manson-Haferd参数模型中,常数(Ta,lgta)不是两个独立的变量,它们之间存在良好的线性关系;在较大范围内Manson-Haferd常数(Ta,lgta)的改变对持久寿命预测结果影响较小。选取统一的Manson-Haferd常数(450,15)关联几种耐热钢的持久性能数据,均得到了精度较高的预测结果。这为材料高温持久性能的比较及精确预测提供了便利的方法。

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