对核电站用阀门进行检查工作时,发现两个阀门的倒密封阀座表面出现了径向裂纹,且最大深度约为2 mm。本工作利用扫描电镜观察、金相组织观察、成分分析、应力有限元分析等手段对产生裂纹的倒密封件进行分析,并结合其实际工况和出厂数据,得出倒密封件的裂纹起源于表面,由表面向硬质合金内部扩展。倒密封件裂纹显微形貌示于图1,倒密封件受力情况有限元模拟示于 When inspecting the valves for nuclear power plants, it was found that there was a radial crack on the surface of the inverted valve seats of the two valves with a maximum depth of about 2 mm. In this work, the cracked inverted seal was analyzed by scanning electron microscopy, metallographic observation, composition analysis and stress finite element analysis. Combined with the actual working conditions and factory data, it was concluded that the crack originated in the inverted seal The surface, extending from the surface to the interior of the cemented carbide. Inverted seal crack morphology is shown in Figure 1, inverted seal force finite element simulation is shown in