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首页> 外文期刊>Steel Research International >A Constitutive Creep Equation for 9Cr-1Mo-0.2V (P91-type) Steel under Constant Load and Constant Stress
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A Constitutive Creep Equation for 9Cr-1Mo-0.2V (P91-type) Steel under Constant Load and Constant Stress

机译：9Cr-1Mo-0.2V（P91型）钢在恒定载荷和恒定应力下的本构蠕变方程

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The creep behaviour of 9Cr-1 Mo-0.2V (P91-type) steel was studied at elevated temperatures of 625 to 675 deg C. These temperatures considerably exceed the maximum service temperature of this steel, which is approximately 600 deg C. Uniaxial creep tests were performed under constant load and constant stress at initial stresses of 120 to 240 MPa. These tests are considered as short-term tests and they can even be applied for creep lifetime assessment, albeit with certain limitations. However, the main purpose of this work was to find a constitutive creep law that would satisfactorily describe the creep behaviour of P91-type steel and enable a comparison of the results obtained with both kinds of creep tests, i.e., under constant load and constant stress. It is well known that the minimum creep strain rate of P91-type steel cannot be satisfactorily described by the simple Arrhenius-type power-law constitutive model. Therefore, an improved stress-dependent energy-barrier model for the description of the creep behaviour of P91 steel was used. The model showed that there is a small difference in the apparent activation energy between constant-load and constant-stress creep tests. The obtained values of the stress-dependent activation energies are, in both types of test, considerably higher than the activation energy for lattice diffusion. This is in good agreement with the literature data, although the obtained activation energies are not so strongly stress dependent. The Monkman-Grant relation showed that the minimum creep strain rate is not quite inversely proportional to the time-to-rupture for both constant-load and constant-stress creep tests.
机译：研究了9Cr-1 Mo-0.2V（P91型）钢在625至675摄氏度的高温下的蠕变行为。这些温度大大超过了该钢的最高使用温度（约600摄氏度）。单轴蠕变试验在恒定载荷和恒定应力下，初始应力为120至240 MPa的条件下进行。这些测试被认为是短期测试，尽管有某些限制，它们甚至可以用于蠕变寿命评估。但是，这项工作的主要目的是找到一种本构蠕变定律，该定律可以令人满意地描述P91型钢的蠕变行为，并且可以比较两种蠕变试验（即在恒定载荷和恒定应力下）的结果。 。众所周知，简单的Arrhenius型幂律本构模型不能令人满意地描述P91型钢的最小蠕变应变率。因此，使用了一种改进的应力相关能垒模型来描述P91钢的蠕变行为。该模型表明，在恒定载荷和恒定应力蠕变测试之间，表观活化能存在微小差异。在两种类型的测试中，所获得的应力相关活化能的值都大大高于晶格扩散的活化能。尽管获得的活化能与应力无关，但与文献数据非常吻合。 Monkman-Grant关系表明，对于恒定载荷和恒定应力蠕变试验，最小蠕变应变率与断裂时间并不完全成反比。

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