STP1270

    Effects of Metallurgical Variables on Swelling of Modified 316 and Higher Ni Austenitic Stainless Steels

    Published: Jan 1996


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    Abstract

    The effects of solute elements and cold-work on swelling in modified 316 and higher Ni advanced austenitic stainless steels developed for FBR core material were investigated together with the posted model alloys. The Si, P, B, Ti, Nb modified and cold-worked steels exhibited an improved swelling resistance. In the temperature range between 400 and 500°C, the swelling was suppressed significantly by an addition of 0.8 wt% Si. The beneficial effect of Si appears to be reduced in the steels without Ti and Nb tending to form γ′ precipitates. In the temperature range between 500 and 600°C, a needle-like phosphide precipitates played an important role in suppressing void growth. Additions of Ti and/or Nb were found to stabilize the phosphide phase and extended the swelling incubation period. In the improved austenitic steels, the synergistic effect of cold-working and P,B,Ti,Nb additions act beneficially to stabilize the dislocation structure and to form finely dispersed precipitates during irradiation.

    Keywords:

    swelling, austenitic steel, phase stability, microstructure, minor elements, alloy design, fast reactor, fuel cladding


    Author Information:

    Shibahara, I
    O-arai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation, O-arai, Ibaraki,

    Akasaka, N
    O-arai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation, O-arai, Ibaraki,

    Onose, S
    O-arai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation, O-arai, Ibaraki,


    Paper ID: STP16513S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP16513S


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