采用θ投影法和自行建立的复合修正模型对10Cr9MoW2VNbBN钢的蠕变曲线进行了预测,并与600℃和650℃时的蠕变试验数据进行了对比.结果表明:θ投影法能较好地描述蠕变应变与时间的关系,但对蠕变速率与时间的关系不能客观描述;自行建立的复合修正模型能够更客观地描述试验钢真实的蠕变行为;但基于复合修正模型的蠕变曲线结合断裂应变进行持久寿命外推时,其外推值高于真实值.
A prediction for the creep curves of 10Cr9MoW2VNbBN steel through θ projection method and self-built correction model was performed,and then compared with the creep experimental data at 600℃ and 650℃.The results show that the θ projection method can well describe the relationship between the creep strain and time,however,it can not describe the relationship between the creep rate and time objectively.The self-built correction model in this paper can describe the real creep behavior of the tested steel.However,when the creep curves based on the self-built correction model combining with fracture strain were used to extrapolate the creep rupture life,the extrapolated value was much higher than the real one.

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