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首页> 外文期刊>Materials Science and Engineering >Creep behavior of Alloy 709 at 700 ℃
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Creep behavior of Alloy 709 at 700 ℃

机译：709合金在700℃下的蠕变行为

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摘要

Alloy 709 is an austenitic stainless steel with potential for structural applications in advanced nuclear reactors. In this study, creep tests on Alloy 709 specimens were performed at a temperature of 700 degrees C under applied stresses in the range of 125-250 MPa. The alloy exhibited a brief primary, insignificant secondary and prolonged tertiary creep stages. A Norton stress exponent (n) of 5.9 +/- 0.7 was obtained from the double-logarithmic plot of minimum creep rate versus stress. Microstructural analyses were carried out for both as-received and crept specimens using optical microscopy, electron backscattered diffraction, and transmission electron microscopy. The microstructures of the as-received and crept specimens were compared. The mode of fracture was trans granular as revealed by scanning electron microscopy of the creep-ruptured specimens. Thermodynamic and precipitation modeling was performed in order to obtain information on the phase types and the kinetics of precipitation for the sigma - phase and the M23C6 carbide. Based on the creep data, microstructural observations and relevant modeling, creep deformation and failure mechanisms at the considered temperature are elucidated.
机译：709合金是一种奥氏体不锈钢，具有在先进核反应堆中进行结构应用的潜力。在这项研究中，对709合金样品的蠕变测试是在700摄氏度的温度下，在125-250 MPa的施加应力下进行的。该合金表现出短暂的初级，微不足道的次级和长时间的三次蠕变阶段。从最小蠕变速率与应力的对数关系图可以得出5.9 +/- 0.7的诺顿应力指数（n）。使用光学显微镜，电子反向散射衍射和透射电子显微镜对接收和蠕变的样品进行了显微结构分析。比较了所接收的样品和蠕变的样品的微观结构。蠕变断裂样品的扫描电子显微镜显示，断裂方式为反型。为了获得有关σ相和M23C6碳化物的相类型和沉淀动力学的信息，进行了热力学和沉淀建模。根据蠕变数据，微观结构观察和相关模型，阐明了在考虑温度下的蠕变变形和破坏机理。

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