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应用电子背散射衍射(EBSD)、扫描电镜(SEM)和显微硬度仪研究了压水堆(PWR)压力容器(RPV)控制棒驱动机构(CRDM)管嘴690合金与152合金焊接热影响区上部、中部和根部的残余应变分布、显微硬度、晶粒平均取向差(GAM)、晶粒边界显微结构和金相特征。研究结果表明:残余应变从上部到下部逐渐减少,最大残余应变5.15%,位于最后焊接的上部热影响区;重合位置点阵∑3边界平均分数从上部到下部逐渐增加,最小∑3边界平均分数是46.6%,显著低于基体金属的68%。因此认为,最后焊接的上部热影响区具有最高应力腐蚀破裂(SCC)敏感性。
The influence of heat treatment on the welding heat affected zone (RBZ) of 690 alloy and 152 alloy of PWR pressure vessel (RPV) control rod driving mechanism (CRDM) nozzle was studied by electron backscatter diffraction (EBSD), scanning electron microscope (SEM) and microhardness tester Residual strain distribution in the upper, middle and root, microhardness, GAM, grain boundary microstructure and metallographic features. The results show that the residual strain decreases gradually from the upper part to the lower part and the maximum residual strain is 5.15%, which is located in the upper heat-affected zone of the last welding. The average Σ3 boundary average fraction increases from the upper part to the lower part and the minimum Σ3 boundary average fraction Is 46.6%, significantly lower than 68% of the base metal. Therefore, it is considered that the welded HAZ has the highest SCC sensitivity.