Failure Analysis Of Rocket Shell Puncher Die

This paper studied Failure analysis of Rocket Shell punching die manufactured in Homichornammunition and engineering industry having the crack on the surface of the male punching die.rnDetailed investigations including macroscopic examination, metallographic observation, andrnmechanical properties analysis were carried out. The investigations reveal that the failurernmechanism of the punching die is fast brittle fracture caused by high stress under therncondition of material self-embrittlement. As it is observed on 39 pieces of the puncher the mainrncrack originated from the lower tip that has a direct contact with the hot of the punching die. Thernserious impact toughness degeneration and presence of impurities at the internal section of therndie resulted in the material embrittlement. The hardness test and the oxidation process formedrninside the material demonstrate that the site 1 and 2 has suffering high stress is the weak part ofrnthe die.rnKey words: Punching die, failure Analysis; Rocket shell: Fatigue failure; selfembrittlement;rnoxidation layer; heat treatment, crack zone

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