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Fatigue performance improvement of electrical discharge machined hardmetals by means of combined thermal annealing and surface modification routes
Llanes Pitarch, Luis Miguel; Casas Aguirregomezcorta, Begoña; Salán Ballesteros, Maria Núria; Mestra Rodríguez, Álvaro Miguel; Torres Hernández, Yadir
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural i Fiabilitat dels Materials; Universitat Politècnica de Catalunya. GIOPACT - Grup de recerca d´Igualtat d´Oportunitats en l´Arquitectura, la Ciència i la Tecnologia
Electrical discharge machining (EDM) provides an effective means of shaping hardmetals. However, it is also known that surface integrity of these materials may be affected by EDM, degrading their tribomechanical characteristics. This work focuses on assessing the use of two different surface modification routes: thermomechanical treatments (shot blasting, polishing and final high temperature annealing) and/or physical vapor deposition of hard coatings, for improving the fracture and fatigue strength of an EDM-shaped fine-grained hardmetal grade. In doing so, an optimal EDM's surface finish variant and a diamond ground and polished one are used. Mechanical behavior is evaluated under four-point bending and fatigue characterization is given in terms of fatigue limit following the staircase method. Experimental results indicate that both approaches markedly decrease the lessening effect of EDM on the mechanical strength of hardmetals, although a complete fracture and fatigue strength retention is only achieved by combining both of them. The improved mechanical behavior is rationalized on the basis of the beneficial changes induced by surface modification on the effective residual stress field at the surface of EDM-shaped hardmetals, as assessed by a linear elastic fracture mechanics analysis combined with fractographic examination.
Àrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials::Assaig de fractura
Àrees temàtiques de la UPC::Enginyeria mecànica
Fracture mechanics
Materials Fatigue
Cemented carbides WC-Co
Electrical discharge machining
Fatigue strength
Residual stresses
Surface modification
Assaigs de materials -- Propietats mecàniques
Attribution-NonCommercial-NoDerivs 3.0 Spain

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