M. Teresa Ferraz  J.Faustino  M. Santos      

Anales de la Mecánica de la Fractura, nº 13 . 1996 . Pág. 428 -432
Ver (.pdf): Anales13-072

Resumen: Failurcs in two plastic injection molds having a parailclcpipcdic geometry (679.5 X 5:13.5 X 86 mm) were analysed. The steel for injection molds. DlN 1.2083-X.f2CrU was heat treated by quenching and tempering to 50-52 HRC hardness. Brittle and not propagated fractures normal to the longitudinal mold axis were obseved in a transversal center plan of the mold. Fractures were origmated in a threaded hole by tensile stresses developed in the manufacture of threads by deformation. Fractographic and metallographice analysis showed a intergranular fracture and abnormal microstutural features as banded segregation. continuous carbide precipitation on grain boundaries and lcss common carbide clusters with preferencial precipitation apparently induccd by non metallic inclusions.

Localización: Luso, Portugal

Instituto Nacional de Engenharia e Tecnología Industrial. IMP, Paço do Lumiar, 1699 LISBOA Codex
Instituto Nacional de Engenharia e Tecnología Industrial. IMP, Paço do Lumiar, 1699 LISBOA Codex
Instituto Nacional de Engenharia e Tecnología Industrial. IMP, Paço do Lumiar, 1699 LISBOA Codex