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首页> 外文会议>International Conference on Environmental Degradation of Materials in Nuclear Power Systems: Water Reactors >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：合金182-SA 508 C1.2不同焊接接头在模拟BWR-NWC条件下的过渡区域中的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 intergramilar/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）不同的焊接接头包含具有复杂微观结构的过渡区域。应力腐蚀在沸水反应堆（BWR）的底封头穿透壳体的焊接金属开裂（SCC）的最近的事件已引起注意在合金182-LAS异种焊接接头的过渡区域中的SCC的行为，并且特别地，到该问题是否在焊缝金属中的intergramilar /枝晶间裂纹SCC传播可以通过熔合线进入相邻LAS容易渗透。在这项研究中，以下的合金182-SA 508 C1.2异种钢焊接接头的过渡区的微观结构表征，在模拟BWR-常规水化学（NWC）环境过渡区的SCC行为进行了研究。结果表明，微结构在融合线上具有急剧性变化，并且SCC传播倾向于在近恒定的负载条件下停止融合线。这种SCC行为显示了LAS的众所周知的SCC行为的一致性，并且具有SCC通常限制在合金182焊缝金属上的现场经验。

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