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首页> 外文期刊>Materials at High Temperatures >Crack behaviour of lOCr-steels under creep and creep-fatigue conditions
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Crack behaviour of lOCr-steels under creep and creep-fatigue conditions

机译：蠕变和蠕变疲劳条件下lOCr钢的裂纹行为

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High-temperature components with notches, defects and flaws may be subjected to crack initiation and crack propagation under service conditions. To study these problems and to support an advanced remnant life evaluation, fracture mechanics procedures are required. Due to a more flexible service mode of power plants an increase of start up and shut down processes can be observed. Therefore knowledge of life assessment and integrity of such components is decisive. In order to enlighten these problems for steam power plant components, crack initiation time and crack growth rate of modern martensitic steels of type lOCrMoWVNbN were determined at 550 and 600 deg C in forged and cast conditions. For the experiments, side grooved compact tension, C(T), specimens were used as well as side grooved double edge notched tensile, DEN(T), specimens. Creep/creep-fatigue crack initiation and crack propagation can be described with the usual fracture mechanics parameters C* and K_I and a modified two-criteria method was established in order to describe creep fatigue crack initiation.
机译：在使用条件下，带有缺口，缺陷和瑕疵的高温组件可能会发生裂纹萌生和裂纹扩展。为了研究这些问题并支持高级剩余寿命评估，需要进行断裂力学程序。由于发电厂的服务模式更加灵活，因此可以观察到启动和关闭过程的增加。因此，生命评估知识和此类组件的完整性至关重要。为了启发蒸汽动力设备部件的这些问题，在锻造和铸造条件下，在550和600℃下确定了10OCrMoWVNbN型现代马氏体钢的裂纹萌生时间和裂纹扩展速率。对于实验，使用了侧面开槽的致密张力C（T）标本以及侧面开槽的双边缘缺口拉力DEN（T）标本。蠕变/蠕变疲劳裂纹萌生和裂纹扩展可以用通常的断裂力学参数C *和K_I来描述，并建立了一种改进的双准则方法来描述蠕变疲劳裂纹萌生。

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