STP948: Fractography of Pressure Vessel Steel Weldments

    Sankar, J
    Assistant professor, North Carolina Agricultural and Technical State University, Greensboro, NC

    Williams, DB
    Professor, Lehigh University, Bethlehem, PA

    Pense, AW
    Professor, Lehigh University, Bethlehem, PA

    Pages: 22    Published: Jan 1987


    Abstract

    An experimental program was carried out to interpret the effect of submerged arc flux compositions on the Charpy toughness and fracture behavior of typical pressure vessel steel weldments. Three different fluxes with varying basicity—namely, Linde Grade 80, Linde Grade 0091, and Oerlikon OP76—were selected for the program. The steel weldments used were C-Mn-Si, 214Cr-1Mo, and A543 Class 1. It has been found that silicon-rich inclusions are harmful to toughness and that Grade 80 welds with the presence of high amounts of these inclusions result in lower toughness compared to Grade 0091 or OP76. Of the three fluxes, OP76 develops a much cleaner weld with very few silicon-rich inclusions, resulting in extremely tough weld. Characterization of toughness at different positions of the weld shows sensitivity of the toughness tests on the weld metal to impact test position.

    Keywords:

    scanning electron microscopy/energy dispersive spectrometry, weld metal, fractography, mechanical properties, structure/property relationships


    Paper ID: STP25625S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP25625S


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