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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 >SCC BEHAVIOR IN THE TRANSITIION REGION OF AN ALLOY 182-SA 508 C1.2 DISSIMILAR WELD JOINT UNDER SIMULATED BWR-NWC CONDITIONS
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SCC BEHAVIOR IN THE TRANSITIION REGION OF AN ALLOY 182-SA 508 C1.2 DISSIMILAR WELD JOINT UNDER SIMULATED BWR-NWC CONDITIONS

机译：模拟的BWR-NWC条件下182-SA 508 C1.2合金异种焊接接头过渡区的SCC行为

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摘要

Alloy 182-Low Alloy Steel (LAS) dissimilar weld joints contain the transition region that has complex microstructure. Recent incidents of stress corrosion cracking (SCC) in the weld metal of bottom head penetration housing of Boiling Water Reactors (BWR) have drawn the attention to the SCC behavior in the transition region of Alloy 182-LAS dissimilar weld joints, and in particular, to the issue whether an intergranular/interdendritic SCC crack propagating in the weld metal could easily penetrate through the fusion line into the adjacent LAS. In this study, following a microstructural characterization of the transition region of an Alloy 182-SA 508 C1.2 dissimilar weld joint, the SCC behavior in the transition region in simulated BWR-Normal Water Chemistry (NWC) environments was investigated. The results showed that the microstructure had a sharp change across the fusion line, and that the SCC propagation tended to cease at the fusion line under near-constant loading conditions. Such a SCC behavior shows consistency with the well-known SCC behavior of LAS, and with the field experience where SCC is usually confined to the Alloy 182 weld metal.
机译：合金182-低合金钢（LAS）的异种焊接接头包含具有复杂微观组织的过渡区域。最近沸水反应堆（BWR）底部头部熔透壳体的焊接金属中发生应力腐蚀开裂（SCC）的事件引起了人们对182-LAS合金异种焊接接头过渡区域中SCC行为的关注，特别是，问题是在焊接金属中传播的晶间/枝晶间SCC裂纹是否容易穿过熔合线渗入相邻的LAS。在这项研究中，根据合金182-SA 508 C1.2异种焊缝过渡区的微观结构特征，研究了在模拟的BWR-普通水化学（NWC）环境中过渡区中的SCC行为。结果表明，在接近恒定的载荷条件下，整个熔合线的微观结构发生了急剧变化，并且SCC的传播趋于在熔合线处停止。这种SCC行为显示出与LAS众所周知的SCC行为一致，并且与通常将SCC限制在182合金焊接金属上的现场经验相一致。

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