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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 >Reduction of Toughness Results for Weld Metal 182 in a PWR Primary Water Environment with Varying Dissolved Hydrogen, Lithium Hydroxide and Boric Acid Concentrations
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Reduction of Toughness Results for Weld Metal 182 in a PWR Primary Water Environment with Varying Dissolved Hydrogen, Lithium Hydroxide and Boric Acid Concentrations

机译：溶解氢，氢氧化锂和硼酸浓度不同时，在压水堆初级水环境中降低焊接金属182的韧性结果

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Primary Water Stress Corrosion Cracking (PWSCC) of Alloy 600, and its weld metals 182 and 82, has recently been experienced in Control Rod Drive Mechanisms (CRDMs) at Oconee units and in reactor vessel (RV) hot leg nozzles at V.C. Summer station. Recent publications by Bettis Laboratory have shown Alloy 600 and weld metal 82, as well as higher chromium weld metal 52 and high chromium base metal Alloy 690, have shown susceptibility to a reduction in toughness due to a hydrogen cracking mechanism at relatively low temperatures between 50℃ and 100℃. Although the above failures have not led investigators to the conclusion of the low temperature hydrogen cracking (LTHC) mechanism directly, the understanding of how to recognize the difference between high temperature PWSCC and low temperature hydrogen cracking (LTHC) due to toughness loss has not been developed. Since Bettis Laboratory has shown the LTHC phenomenon for Alloy 600 and weld metal 82, it was believed weld metal 182 was also susceptible to this method of cracking. The work described in this paper focused on reproducing the Bettis results for weld metal 82 and addressed the lack of data for weld metal 182. The tests focused on a test temperature of 54℃ in varying concentrations of dissolved hydrogen, lithium hydroxide and boric acid concentrations. The conclusions to date have shown that in high hydrogen water (100 to 150 cc H_2 / kg H_2O) both weld metal 82 and weld metal 182 exhibit an order of magnitude reduction in toughness in comparison to the air data at the same temperature. As dissolved hydrogen concentrations are reduced, the toughness recovers to some degree, but not fully. Fracture surfaces were examined with an SEM after testing. These surfaces have revealed predominantly intergranular failure along the dendrites under high strain with some evidence of ductility in the surrounding matrix.
机译：合金600及其焊接金属182和82的一次水应力腐蚀开裂（PWSCC）最近在Oconee装置的控制棒驱动机构（CRDM）和V.C的反应堆容器（RV）热腿喷嘴中经历过。夏季站。贝蒂斯实验室（Bettis Laboratory）的最新出版物显示合金600和焊缝金属82以及较高铬的焊缝金属52和高铬贱金属合金690已显示出在50至50之间的相对低温下由于氢裂化机理而导致韧性降低的可能性℃和100℃。尽管上述失败并未使研究人员直接得出低温氢裂化（LTHC）机理的结论，但尚未了解如何识别由于韧性损失而导致的高温PWSCC与低温氢裂化（LTHC）之间的差异。发达。由于贝蒂斯实验室已显示出合金600和焊缝金属82的LTHC现象，因此认为焊缝金属182也容易受到这种开裂方法的影响。本文所述的工作着重于再现焊接金属82的Bettis结果，并解决了焊接金属182缺乏数据的问题。测试的重点是在54℃的测试温度下，溶解氢，氢氧化锂和硼酸浓度的变化。迄今为止的结论表明，与相同温度下的空气数据相比，在高氢水（100至150 cc H_2 / kg H_2O）中，焊缝金属82和焊缝金属182的韧性均降低了一个数量级。随着溶解氢浓度的降低，韧性恢复到一定程度，但不能完全恢复。测试后用SEM检查断裂表面。这些表面已显示出在高应变下沿枝晶的主要晶间破坏，并且在周围基质中具有一些延展性的证据。

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