激光焊接核电用CLF-1钢的组织与性能
Journal of Shenyang University of Technology（2022）
Abstract
为了提高CLF-1钢的焊接质量,采用激光焊接技术获得了成形良好且无冶金缺陷的对接焊缝,研究了焊态与PWHT态下的焊缝组织和力学性能.结果表明:焊缝组织均由大量马氏体及少量δ-铁素体组成;焊态下有微量针状碳化物析出,PWHT态下析出的点状碳化物分布在δ-铁素体边界与板条马氏体内部;与焊态相比,PWHT态焊缝抗拉强度降低,而屈服强度、伸长率和断面收缩率均提高,维氏硬度均值降低;拉伸试样均断裂于远离焊接接头的母材处;由于δ-铁素体的存在,焊态和PWHT态焊缝冲击功均低于母材.
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