hydraulic coupling gear failure causes

Large power station boiler feed pump hydraulic coupling gear shaft sudden rupture during operation , which is why, below you analyze .First, a large hydraulic coupling on the broken shaft gear usage , the chemical composition of the steel , high and low times , umbrella -phase structure , grain size , mechanical properties and fracture surface of  Hydraulic adaptersreal axis of the macro view of fracture for fracture , and Wei the observation and detection and analysis .Secondly, the analysis of large gear shaft of the production process and the use of profiles , using optical microscopy, scanning electron microscopy , transmission electron microscopy and X- ray spectrometer to observe and analyze the failure of the shaft fracture.