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首页> 外文会议>12th International Conference on Environmental Degradation of Materials in Nuclear Power Systems: Water Reactors 2005 vol.2 >LOAD PATH EFFECTS ON THE FRACTURE TOUGHNESS OF ALLOY 82H AND 52 WELDS IN LOW TEMPERATURE WATER
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LOAD PATH EFFECTS ON THE FRACTURE TOUGHNESS OF ALLOY 82H AND 52 WELDS IN LOW TEMPERATURE WATER

机译：加载路径对低温水中82H和52焊缝断裂韧性的影响

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Nickel-base welds experience a severe reduction in fracture resistance in low temperature (<150℃) water due to a hydrogeninduced intergranular cracking mechanism. In this study, fracture toughness testing of Alloy 82H and 52 welds was performed in 54℃ hydrogenated water to characterize load path effects on the low temperature crack propagation (LTCP) behavior. The fracture response obtained with conventional fracture toughness tests conducted in 54℃ water is compared with LTCP results obtained in constant-load tests at 54℃ and cooldown tests from 288℃ to 54℃ under mildly increasing-load or constant-displacement conditions. LTCP occurred under constant-load conditions, but only at K levels well above K_(JIC) from fracture toughness tests in water. During cooldowns under constant-displacement conditions, two Alloy 82H welds resisted LTCP at K levels well above K_(JIC), but a third weld exhibited rapid cracking at K levels comparable to K_(JIC). These findings demonstrate that although the LTCP resistance for some welds is enhanced under constant-load and constant-displacement conditions, the possibility of LTCP during cooldown under constant-displacement conditions cannot be ruled out. An Alloy 52 weld resisted LTCP under isothermal/constant-load conditions and during cooldown under mildly increasing load conditions at K levels up to 75% greater than toughness values obtained in conventional fracture toughness tests. Load-path effects data for both Alloy 82H and 52 welds demonstrate the importance of uploading in initiating LTCP.
机译：由于氢引起的晶间开裂机制，镍基焊缝在低温（<150℃）水中的耐断裂性大大降低。在这项研究中，在54℃氢化水中对82H和52合金焊缝进行了断裂韧性测试，以表征载荷路径对低温裂纹扩展（LTCP）行为的影响。将在54℃水中进行的常规断裂韧性测试获得的断裂响应与在54℃恒定负载测试和在中等负载或恒定位移条件下从288℃冷却至54℃的冷却测试获得的LTCP结果进行比较。 LTCP在恒定负载条件下发生，但仅在水中的断裂韧性测试中，在远高于K_（JIC）的K水平下发生。在恒定排量条件下的冷却过程中，两个82H合金焊缝在远高于K_（JIC）的K水平下抵抗LTCP，但是第三焊缝在K水平下却具有与K_（JIC）相当的快速开裂。这些发现表明，尽管在恒定载荷和恒定位移条件下，某些焊缝的LTCP抵抗力得到了增强，但不能排除在恒定位移条件下冷却过程中LTCP的可能性。合金52焊缝在等温/恒定负载条件下以及在冷却期间在轻度增加的负载条件下的耐LTCP性能比传统断裂韧性测试中获得的韧性值高75％，K含量高。 82H和52合金焊缝的载荷路径效应数据证明了在启动LTCP时上传的重要性。

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