The heat-affected zone (HAZ) hardness in boron-containing steels increases with an increase in the reheating temperature above the AC3 temperature, and the HAZ hardness gradually decreases with an increase in the reheating temperature after there is a maximum hardness at a certain peak temperature. On the other hand, the HAZ hardness in boron-free steels increases with an increase in the reheating temperature in the austenite region above the AC3 temperature during welding. Boron segregates to the austenite grain boundary during cooling after welding. This is called the non-equilibrium segregation phenomenon. This non-equilibrium segregation during cooling causes the boron concentration in the austenite grain boundary to increase with an increase in the reheating temperature. However, boron begins to precipitate in the austenite grain boundary when the boron concentration in the austenite grain boundary reaches the critical boron concentration required for the precipitation. Therefore, the HAZ hardness begins to decrease with an increase in the reheating temperature after the maximum boron segregation is reached in the austenite grain boundary, which corresponds to the maximum hardness. This is the reason that the HAZ hardness distribution of boroncontaining steels is considerably different from that of boron-free steels.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    HAZ hardness distribution of low-carbon boron-containing high-strength linepipe steels


    Weitere Titelangaben:

    Härteverteilung in der Wärmeeinflusszone von niedrig-gekohlten, borhaltigen, hochfesten Pipelinestählen


    Beteiligte:


    Erscheinungsdatum :

    2013


    Format / Umfang :

    7 Seiten, 10 Bilder, 3 Tabellen, 15 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




    Characterisation of ultra high strength linepipe

    Ohm, R.K. / Martin, J.T. / Orzessek, K.M. | Tema Archiv | 2000


    Development of high strength linepipe steel

    Yoo, Janq-Yong / Seo, Dong-Han / Ahn, Seong-Soo et al. | Tema Archiv | 2008


    Allowable strains for high strength linepipe

    Hohl, G.A. / Vogt, G.H. | Tema Archiv | 1992



    The role of niobium in high strength oil and gas transmission linepipe steels

    Stalheim, Douglas G. / Jansto, Steven G. | Tema Archiv | 2007