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Modelling of creep damage in high temperature component life assessment

机译：高温部件寿命评估中的蠕变损伤建模

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Creep damage gradually proceeds in high temperature components in thermal power plants featuring creep void nucleation and growth. Accurate prediction of the creep damage is necessary for reliable operation and life extension of these components. Microstructural changes of a 1%CrMoV steel and a longitudinal welded tube of 9%Cr steel during creep were observed with creep test interrupted specimens by means of SEM. It was suggested that void growth is controlled mainly by a diffusion mechanism affected by matrix creep deformation and constraint of surrounding grains. Based on microstructural observation and theoretical considerations, a void initiation and growth model was proposed, and a void simulation program incorporating the void initiation and growth model was developed. It was demonstrated that void initiation and growth behaviour in homogenous materials as well as in heat affected zone in a welded tube was quantitatively predicted by the void simulation program. This suggests that local damage evolution in components may be predicted by the proposed method.
机译：蠕变损害在具有蠕变空隙成核和生长特征的热电厂的高温组件中逐渐发生。为了使这些组件可靠运行并延长使用寿命，必须对蠕变损伤进行准确的预测。蠕变试验中断试样通过SEM观察到蠕变过程中1％CrMoV钢和9％Cr钢的纵向焊接管的组织变化。有人提出，空洞的生长主要受基体蠕变变形和周围晶粒约束的扩散机制控制。基于微观结构观察和理论考虑，提出了一种空洞形成和生长模型，并开发了一个包含空洞形成和生长模型的空洞模拟程序。结果表明，空隙模拟程序定量预测了均质材料以及焊管热影响区的空隙萌生和生长行为。这表明通过所提出的方法可以预测部件中的局部损伤演变。

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