【摘要】 利用金相显微镜、扫描电子显微镜、能谱仪和X射线衍射仪及冲击试验机研究了运行165 000 h后F12钢的脆化现象。结果表明,高温运行后F12钢马氏体基体发生分解细化,M23C6在晶界析出并聚集长大,呈连续链球状或孤立颗粒状分布,引起晶界显著脆化。更多还原

【Abstract】 Embrittlement phenomenon of F12 steel after servicing for 165 000 h was investigated by using optical microscopy,scanning electron microscopy,energy dispersive spectroscopy,X-ray diffractometer and impact test. The results show that decomposition and fragmentation occur for the martensitic matrix of F12 steel after running exposure to high temperature. M23C6 carbides precipitate,agglomerate and grow along the grain boundaries,resulting in the distribution morphology of continous chain-spherical and isolated particles,which subsequently causes the grain boundary embrittlement.更多还原