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首页> 外文会议>ASME Pressure Vessels and Piping conference >EVALUATION OF CRACK GROWTH OF NI-BASE ALLOYS UNDER LONG TERM CYCLIC LOADING IN BWR ENVIRONMENT
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EVALUATION OF CRACK GROWTH OF NI-BASE ALLOYS UNDER LONG TERM CYCLIC LOADING IN BWR ENVIRONMENT

机译：BWR环境下长期循环载荷下镍基合金裂纹扩展的评估

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摘要

Crack growth test data of Ni-base alloys under cyclic loading in simulated boiling water reactor (BWR) environment including the effects of load rising time (t_r) were evaluated in the view points of both fatigue and stress corrosion cracking (SCC). When the test data were plotted in the relationship between da/dt and K_(max), da/dt monotonically decreased with increasing t_r and the stress ratio (R). For alloy 182 weld metal under short t_r and/or low R, the crack growth rate assuming SCC is much lower than those of the test data. For alloy 182 under t_r = 30 and 1000 s at R = 0.8, the crack growth rate assuming SCC almost coincided with test data. For heat affected zone (HAZ) of alloy 600 base metal (600HAZ), the crack growth rate assuming SCC had much different slope of da/dN-AK relationship compared with the test data in the tested range of t_r up to 3000 s. From these observations, the contribution of SCC is relatively small and the main mechanism of crack growth is thought to be fatigue for the tested range (t_r=1 to 1000 s for weld metal, t_r=1 to 3000 s for base metal and R = 0.1 to 0.8). It was assured that the fatigue crack growth formula proposed by the authors accounts the effect of SCC adequately at long t_r. Additionally, the applicability of the fatigue crack growth rate formula for austenitic stainless steels to the long term cyclic load was investigated and it was found that the formula can be applied to t_r=30000 s.
机译：从疲劳和应力腐蚀裂纹（SCC）的角度，评估了模拟沸水反应堆（BWR）环境中镍基合金在循环载荷下的裂纹扩展测试数据，包括载荷上升时间（t_r）的影响。当以da / dt和K_（max）之间的关系绘制测试数据时，da / dt随着t_r和应力比（R）的增加而单调降低。对于短t_r和/或低R的合金182焊接金属，假设SCC的裂纹扩展速率远低于测试数据。对于t_r = 30和R = 0.8时1000 s的合金182，假设SCC的裂纹扩展速率与测试数据几乎一致。对于合金600母材（600HAZ）的热影响区（HAZ），假定的SCC的da / dN-AK关系斜率与t_r高达3000 s的测试范围内的测试数据相比，斜率的增长率相差很大。从这些观察结果来看，SCC的贡献相对较小，并且裂纹扩展的主要机理被认为是测试范围内的疲劳（焊缝金属t_r = 1至1000 s，贱金属t_r = 1至3000 s，R = 0.1至0.8）。可以肯定的是，作者提出的疲劳裂纹扩展公式充分说明了长t_r时SCC的影响。另外，研究了奥氏体不锈钢的疲劳裂纹扩展率公式对长期循环载荷的适用性，发现该公式可以应用于t_r = 30000 s。

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