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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference: Residual Stress, Fitness - for - Service and Manufacturing Processes; 20030720-20030724; Cleveland,OH; US >EFFECT OF PLASTICITY ON FATIGUE LIFE OF WELDED NUCLEAR COMPONENT WITH LOCAL BRITTLE ZONE
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EFFECT OF PLASTICITY ON FATIGUE LIFE OF WELDED NUCLEAR COMPONENT WITH LOCAL BRITTLE ZONE

机译：塑性对局部脆性区焊接核组件疲劳寿命的影响

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摘要

The local brittle zone (LBZ), which has lower tensile properties as well as lower fracture toughness than base metal and weldment, can occur on the heat affected zone (HAZ) of some nuclear components made of low alloy steels due to the carbide coarsening by multi-pass welding and post-weld heat treatment. These variations of material strengths across the welds due to the LBZ can produce strain concentrations when the stress amplitude is large enough to cause cyclic plastic flow. But, it is difficult to find the previous researches about a relation between the fatigue life of LBZ on real nuclear components and plasticity. So, in this study, the microstructures and tensile properties of HAZ on nuclear components are predicted by using the semi-analytical method, and the fatigue lifetimes of welds on nuclear components with the LBZ are evaluated by the finite element method considering the local plasticity and the variations of tensile properties, and the fatigue analysis procedure of ASME B&PV Code Sec.III. Finally, the effect of LBZ on nuclear components on fatigue lifetime is reviewed.
机译：与低碳钢相比，低脆性区（LBZ）的拉伸性能以及断裂韧性均低于母材和焊接件，由于低碳钢的碳化物粗化，会在某些低合金钢核部件的热影响区（HAZ）上发生多道次焊接和焊后热处理。当应力振幅大到足以引起循环塑性流动时，由于LBZ而导致的跨焊缝材料强度的这些变化会产生应变集中。但是，很难找到有关LBZ的真实核组件疲劳寿命与可塑性之间关系的先前研究。因此，在本研究中，通过半分析方法预测了热影响区在核部件上的组织和拉伸性能，并通过考虑局部塑性和局部塑性的有限元方法对核部件上的LBZ焊缝的疲劳寿命进行了评估。拉伸性能的变化以及ASME B＆PV规范第III节的疲劳分析程序。最后，综述了LBZ对核成分对疲劳寿命的影响。

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