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  • Changes to the fracture behaviour of medium-alloyed ledeburitic tool steel after plasma nitriding = Spremembe v načinu preloma srednje legiranega ledeburitnega jekla zaradi plazemskega nitriranja
    Jurči, Peter ; Hnilica, František ; Cejp, Jiří
    Three-point test specimens made from VANADIS 4 Extra cold-work steel were heat treated using two basic regimes and a different hardness was obtained in each case. The cross-section of the specimens ... was 10 mm x 10 mm. Plasma nitriding was carried out using various combinations of temperature, processing time and atmosphere. Fracture-toughness tests using the method of static three-point bending showed the dominant role of the presence of a nitrided layer on both the bending strength and the fracture mechanism. Only if the material was not plasma nitrided did the role of the austenitizing temperature become clear, and in this case the higher the temperature, the lower the bending strength. The initiation and the propagation of the fracturew ere low-energy ductile for the steel that was hardened and tempered. The presence of the plasma-nitrided region on the surface changed the initiation as well as the propagation mechanism to that of cleavage. The thickness of the cleavage region increased as the nitrided region became thicker, which additionally lowered the bending strength.
    Source: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Vol. 41, št. 5, 2007, str. 231-236)
    Type of material - article, component part
    Publish date - 2007
    Language - english
    COBISS.SI-ID - 632746

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