STP955

    Void Swelling and Microstructural Change in Neutron Irradiated Type 316 Stainless Steel

    Published: Jan 1987


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    Abstract

    Microstructural observations were made on cold-worked Type 316 stainless steel following fast neutron irradiation to a peak neutron fluence of 1.3 × 1027 n/m2 (E > 0.1 MeV) at temperatures from 400 to 620°C. The results show that nickel depletion in the matrix after neutron irradiation is related to the formation of phosphides and void swelling. Phosphorus in solution retards not only the recovery of dislocations but also the development of nickel- and silicon-rich phases, and this results in suppressing nickel depletion in the matrix and an extension of the transient regime in void swelling. Phosphides are formed during the transient regime at temperatures from 490 to 570°C. After phosphides are formed, retardation effects on both dislocation recovery and the formation of nickel- and silicon-rich phases are lost, and this leads to the onset of void swelling.

    Keywords:

    Type 316 stainless steels, cold working, void swelling, fast reactor, neutron irradiation, microstructure, phosphide, phase stability


    Author Information:

    Itoh, M
    Assistant senior engineer, research assistant, and manager, Power Reactor and Nuclear Fuel Development Corporation, Oarai, Ibaraki,

    Onose, S
    Assistant senior engineer, research assistant, and manager, Power Reactor and Nuclear Fuel Development Corporation, Oarai, Ibaraki,

    Yuhara, S
    Assistant senior engineer, research assistant, and manager, Power Reactor and Nuclear Fuel Development Corporation, Oarai, Ibaraki,


    Paper ID: STP33812S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP33812S


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