ABSTRACT A new tensile creep model that integrates the tensile strength at creep temperature is investigated for its generic applicability in predicting the long-term creep strengths from short-term creep test data for high Cr creep-resistant steels using creep and tensile strength data measured for a grade of 11Cr steel. The results show that, when the long-term creep strengths are specified by stresses producing the required minimum creep rate, they can be accurately predicted using short-term creep test data. However, when they are specified by stresses giving the required creep rupture time, using only short-term creep test data will lead to over-predictions. The microstructure evolution origin of such over-predictions is traced to the Z-phase precipitation during creep in creep-resistant steels with more than 9 wt.% Cr. The conventional concept on the relationship between creep test stress and creep mechanisms is also re-evaluated in light of the new results.

中文翻译：

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高Cr抗蠕变钢短期蠕变试验数据的长期蠕变强度预测和过度预测的微观结构演化起源

摘要 研究了一种新的拉伸蠕变模型，该模型整合了蠕变温度下的拉伸强度，它具有通用的适用性，可根据高 Cr 抗蠕变钢的短期蠕变试验数据使用蠕变和拉伸强度数据来预测长期蠕变强度。 11Cr钢级。结果表明，当长期蠕变强度由产生所需最小蠕变速率的应力指定时，可以使用短期蠕变试验数据准确预测。然而，当它们通过应力指定所需的蠕变断裂时间时，仅使用短期蠕变试验数据将导致高估。这种高估的微观结构演化起源可追溯到 Cr 含量超过 9 wt.% 的抗蠕变钢蠕变过程中的 Z 相析出。