The correlation of microstructure and Charpy V-notch (CVN) impact properties of a high-toughness API X70 pipeline steel was investigated in this study. Six kinds of steel were fabricated by varying the hot-rolling conditions, and their microstructures, effective grain sizes, and CVN impact properties were analyzed. The CVN impact test results indicated that the steels rolled in the single-phase region had higher upper-shelf energies (USEs) and lower energy-transition temperatures (ETTs) than the steels rolled in the two-phase region because their microstructures were composed of acicular ferrite (AF) and fine polygonal ferrite (PF). The decreased ETT in the steels rolled in the single-phase region could be explained by the decrease in the overall effective grain size due to the presence of AF having a smaller effective grain size. On the other hand, the absorbed energy of the steels rolled in the two-phase region was considerably lower because a large amount of dislocations were generated inside PF's during rolling. It was further decreased, when coarse martensite or cementite was formed during the cooling process.


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    Title :

    Effective grain size and charpy impact properties of high-toughness X70 pipeline steels


    Additional title:

    Effektive Korngröße und Kerbschlag-Eigenschaften von hochzähem X70 Pipeline-Stählen


    Contributors:


    Publication date :

    2005


    Size :

    8 Seiten, 9 Bilder, 4 Tabellen, 36 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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