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首页> 外文期刊>Journal of Materials Engineering and Performance >Experimental Study on Creep Characterization and Lifetime Estimation of RPV Material at 723-1023 K
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Experimental Study on Creep Characterization and Lifetime Estimation of RPV Material at 723-1023 K

机译：723-1023 K蠕变表征和寿命估计的实验研究

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摘要

During the plant operation, nuclear reactor pressure vessel (RPV) is the most critical pressure boundary component for integrity and safety in a light-water reactor. In this paper, the creep behavior and properties for RPV metallic material are studied by conducting constant-temperature and constant-load creep tests at 723, 823, 923 and 1023 K. The theta projection constitutive model was established based on a creep method to describe the high-temperature creep behavior of RPV material. The material parameter theta would be obtained based on experimental data by depending on numerical optimization techniques. The relationship between and among theta, T and sigma was evaluated, and the coefficients a (i) , b (i) , c (i) and d (i) were obtained. Based on the short-term tests at a high temperature, the values for long-term creep data could be predicted in accordance with parameter theta. Moreover, rupture life, the minimum creep rate and the time reaching to an arbitrary strain can be calculated and may be used to evaluate the damage behavior and properties, so as to be used as a reference for design and safety assessment.
机译：在核电站运行期间，核反应堆压力容器（RPV）是轻水反应堆完整性和安全性最关键的压力边界部件。本文通过在723、823、923和1023 K下进行恒温和恒载蠕变试验，研究了RPV金属材料的蠕变行为和性能。基于蠕变方法，建立了描述RPV材料高温蠕变行为的θ投影本构模型。通过数值优化技术，根据实验数据获得材料参数θ。评估了θ、T和sigma之间的关系，得到了系数a（i）、b（i）、c（i）和d（i）。基于高温下的短期试验，可以根据参数θ预测长期蠕变数据的值。此外，还可以计算断裂寿命、最小蠕变率和达到任意应变的时间，并可用于评估损伤行为和性能，从而为设计和安全评估提供参考。

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