Fatigue fracture of cutter blade made of high-speed steel

An interesting  paper in « Case study in Engineering Failure Analysis » published on ScienceDirect.com. This paper presents the failure analysis of broken blade of the cutter Ku 500VX. The damage of the blade was caused by changes of the structure (formation of the brittle micro dendritic structure) that occurred during manual electric engraving process when the material was heated till its melting point. As a results the stresses occurred in surface what provided to micro cracking and to propagate the fatigue fracture. The origin of this fatigue fracture was in the place where the inscription was made.

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