比较分析了复合模型法和θ投影法在描述P92钢蠕变行为时的差异.结果表明:两者在拟合P92钢蠕变-时间关系曲线上均有较高的精度,但在描述蠕变速率-时间曲线上,θ投影法呈现较大的误差而复合模型则有良好的关联结果.在外推蠕变速率时,θ投影法的外推结果发生较大偏折,而复合模型的预测结果更接近实际变化趋势.基于蠕变曲线外推持久寿命的结果表明:5％～50％范围内的断裂应变对寿命预测结果影响较小,两种模型预测的持久寿命值之间也相差不大.
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