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采用光学显微镜、扫描电子显微镜、能谱仪、X射线衍射分析等方法并通过冲击试验,研究了650℃时效条件下HR3C钢焊缝金属的组织和冲击韧性变化。结果表明:焊缝金属组织为γ+析出相,其主要析出相种类均为Nb(C,N)、M23C6和富Cu相;随时效时间延长,析出相数量不断增加,其中M23C6析出对析出相数量变化起主要作用;时效后焊缝金属的冲击功出现了急剧降低,200 h即达到显著的脆化状态,造成时效脆化的主要原因是时效过程中M23C6析出量的变化。
The microstructure and impact toughness of weld metal of HR3C steel under 650 ℃ aging were studied by optical microscopy, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction analysis. The results show that the microstructure of the weld metal is γ + precipitates, and the main precipitates are Nb (C, N), M23C6 and Cu-rich phases. With the aging time increasing, the amount of precipitates increases continuously. The number of changes plays a major role; after aging, the impact energy of the weld metal sharply decreased, reaching a significant embrittlement state after 200 h, the main cause of aging embrittlement is the change of precipitation amount of M23C6 during aging.