Abstract
Abstract This paper reports the microstructural characterization of failed vane type hydraulic drive rotor of aero-engine. The chemical compositions obtained by instrumental techniques indicate that the rotor is manufactured from martensitic stainless steel. The microstructures of rotor show elongated δ-ferrite in a matrix of tempered martensite. At higher magnified micrographs reveal films of carbides along the boundaries of δ-ferrite. The electron probe micro analyser (EPMA) studies confirm that these carbides are enriched with Cr and C and are Cr23 C6 type carbides. The fracture surfaces of the failed component exhibit predominantly a quasi-cleavage fracture with a few pockets showing transgranular fracture features. The fractography features indicates that the failure had occurred at relatively at high strain rate. The fillet radius of as-received failed component is also quite sharp. The insufficient fillet radius at the root head-shaft junction has acted as the requisite stress raiser. Moreover, δ-ferrite present with carbide film network reduces the transverse ductility and impact toughness of the material. The brittleness of the material due to the presence of δ- ferrite with carbide films along its boundaries in the microstructure has facilitated the failure.
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