Microalloyed (MA) medium carbon forging steels are gaining acceptance as a replacement for the traditional quenched and tempered grades. Substantial cost reduction provides the driving force for the change. The ferrite-pearlite microstructure is strengthened by precipitation of MA compounds during cooling from the forging temperature. Because of high solubility of vanadium in medium-carbon steels, this element is the preferred MA additive. Forging is generally performed by conventional (high-temperature) practice. The rate of cooling, however, must be controlled. In many instances, air cooling on a conveyer gives satisfactory results. For applications requiring improved notch toughness, small additions of titanium (0.01%) were found to be effective. A dispersion of fine titanium nitride particles contributes to grain refinement by pinning the austenite grain boundaries. The fine grained steel exhibits impact properties comparable to quenched and tempered carbon steel. Improved machinability of MA steels compared to heat-treated steel grades enhances further their cost advantages. To assure a safe and reliable performance of MA steels, the substitution is usually based on the results of component testing, subjected to simulated service conditions. This approach requires a coordinated co-operative effort, involving metallurgists and engineers of the user, steel producer, and forging personnel.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Microalloyed Forging Steels-A State of the Art Review


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    SAE International Congress and Exposition ; 1989



    Erscheinungsdatum :

    1989-02-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Microalloyed forging steels - a state of the art review

    Korchynsky,M. / Paules,J.R. / Stratcor,Strategic Minerals,Pittsburgh,US | Kraftfahrwesen | 1989


    Microalloyed steels for forging - optimization of process parameters

    Prado,J.M. / Herrero,A. / Cabrera,J.M. et al. | Kraftfahrwesen | 1991


    Evalution of fatigue properties of microalloyed forging steels

    Hui, Weijun / Zha, Xiaoqin / Zhang, Yingjian et al. | Tema Archiv | 2006


    The rolling contact fatigue behaviour of NB and B added microalloyed forging steels

    Lee,J.S. / Son,C.H. / Kim,D.Y. et al. | Kraftfahrwesen | 2005


    Physical metallurgy applications and enhanced machinability of microalloyed V-Ti-N forging steels

    Glodowski,R.J. / Korchynsky,M. / Banerji,S.K. et al. | Kraftfahrwesen | 1998