STP648

    Elevated Temperature Fatigue Characterization of Transition Joint Weld Metal and Heat Affected Zone in Support of Breeder Steam Generator Development

    Published: Jan 1978


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    Abstract

    Piping systems in breeder reactor plants will require transition joint weldments between austenitic and ferritic materials. Specifically, annealed 2¼Cr-1Mo steel will be welded with ERNiCr-3 using the hot wire automatic gas tungsten-arc process. These weldments may see elevated temperature service for periods of up to 30 years, and, accordingly, prototypic weldments will require extensive mechanical property characterization. It was the objective of this effort to define the strain controlled low cycle fatigue behavior of as-deposited and stress-relieved ERNiCr-3 weld metal and to develop test methods for establishing the cyclic behavior of heat-affected-zone (HAZ) material. Low cycle fatigue and cyclic stress-strain response for ERNiCr-3 were established over the temperature range of 295 to 866 K. A number of low cycle fatigue test results are reported for hourglass-shaped specimens that demonstrated that the low cycle fatigue behavior of HAZ material adjacent to the fusion line could be characterized.

    Keywords:

    fatigue tests, weldments, fatigue (materials), high temperature, fatigue, low alloy steels, Inconel, stress cycle, weld metals


    Author Information:

    Brinkman, CR
    Group leader and mechanical engineer, Mechanical Properties Group, and metallurgist, Welding and Brazing Group, Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tenn

    Strizak, JP
    Group leader and mechanical engineer, Mechanical Properties Group, and metallurgist, Welding and Brazing Group, Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tenn

    King, JF
    Group leader and mechanical engineer, Mechanical Properties Group, and metallurgist, Welding and Brazing Group, Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tenn


    Paper ID: STP33397S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP33397S


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