Author(s)

Yuan Guohe, Jao Yang, Wang Chun, Feng Yanpeng

Corresponding Author

Feng Yanpeng

ABSTRACT

The abstract should summarize the contents of the paper and should contain at least 100 and at most 300 words. It should be set in 12-point font size. There should be a space before of 18-point and after of 60-point.Hub bolt is one of the critical components to guarantee the safety during the approach and takeoff process of aircraft. One hub bolt was found broken in middle side after several hundred hours' service. Optical microscope and scanning electron microscope were used to investigate the macro- and micro-structures of broken bolt and fracture. That was fatigue characteristic, intergranular fracture with claw pattern was found near the propagation region, and a corrosion pit was found on the side of fatigue source. Cooperation with area-scan function of Energy Distribution Spectrum(EDS), it shown that the bolt on cadmium plated treatment, process condition is not appropriate. Raw cadmium plating bulge and broken in the formation of the pit, during subsequent passivation, amounts of chromium deposit on the pit position and closed depressions, while, NDT cannot effectively detect defects before installed.

KEYWORDS

Hub bolt, Cadmium plating, Hydrogen embrittlement.