Fracture Analysis of Distributing Pipes of Fractured Reactor

The macro-appearance, micro-structure, chemical component, hardness, phases composition and the appearance of fracture for distributing pipes of fractured reactor were investigated.The results show that the oxidation corrosion happened on outside surface of distributing pipe, which resulted in the oxidation crack at the interface of crystal on the surface of the distributing pipe when the distributing pipe of reactor worked on its running conditions.The decomposing of NH₃ induced the nitriding on the inside surface of the pipes.Nitride was synthesized conformed from the microstructure and chemical results, which belong to the brittle phases.The outside surface of pipe tends to crack under the condition of vibration, which induced the failure of the distributing pipes of fractured reactor.