STP956

    Irradiation Embrittlement of Advanced Pressure Vessel Steels

    Published: Jan 1987


      Format Pages Price  
    PDF Version (176K) 12 $25   ADD TO CART
    Complete Source PDF (14M) 12 $114   ADD TO CART


    Abstract

    Seven commercial steels in the form of plate, forging, or weldments supplied by Japan, France, and the Federal Republic of Germany to the International Atomic Energy Agency (IAEA) Co-ordinated Research Programme on “Analysis of the Behaviour of Advanced Reactor Pressure Vessel Steels under Neutron Irradiation” were irradiated at 290°C to a nominal fast fluence of 1 × 1019 n/cm2 (>1 MeV) to evaluate the embrittlement sensitivity of these steels under neutron irradiation. These steels were basically of ASTM Types A533 and A508 (Unified Numbering System [UNI] K12521 and K13502) and their weldments, which had extra low copper and phosphorous contents. The copper and phosphorous contents in these individual steels varied from 0.01 to 0.07 wt% and 0.007 to 0.015 wt%, respectively. The nickel contents in these steels varied from 0.56 to 0.93 wt%.

    The scope of this study was mainly to evaluate the changes in the notch ductility, tensile properties, and hardness as caused by fast neutron irradiation. This paper reports the results obtained on these advanced pressure vessel steels in the form of base metal, weldments, and weld heat affected zones. The results indicated that these advanced steels were practically insensitive to fast neutron induced embrittlement. The relative embrittlement of these steels were further analyzed to examine the contribution of nickel in presence of copper in causing embrittlement. The impact test results indicated that threshold amounts of 0.04-wt% copper and 0.7-wt% nickel would perhaps be required to cause relatively enhanced embrittlement in these steels, confirming thereby that nickel in presence of copper can cause enhanced fast neutron induced embrittlement.

    Keywords:

    pressure vessel steels, irradiation, irradiation embrittlement, embrittlement sensitivity, notch ductility, tensile properties, hardness, nickel-copper effect, neutron fluence


    Author Information:

    Sivaramakrishnan, KS
    Head of post irradiation examination section, scientific officer, scientific officer, scientific officer, scientific officer, and associate director of metallurgy group, Radiometallurgy Division, Bhabha Atomic Research Centre, Trombay, Bombay

    Chatterjee, S
    Head of post irradiation examination section, scientific officer, scientific officer, scientific officer, scientific officer, and associate director of metallurgy group, Radiometallurgy Division, Bhabha Atomic Research Centre, Trombay, Bombay

    Anantharaman, S
    Head of post irradiation examination section, scientific officer, scientific officer, scientific officer, scientific officer, and associate director of metallurgy group, Radiometallurgy Division, Bhabha Atomic Research Centre, Trombay, Bombay

    Viswanathan, UK
    Head of post irradiation examination section, scientific officer, scientific officer, scientific officer, scientific officer, and associate director of metallurgy group, Radiometallurgy Division, Bhabha Atomic Research Centre, Trombay, Bombay

    Balakrishnan, KS
    Head of post irradiation examination section, scientific officer, scientific officer, scientific officer, scientific officer, and associate director of metallurgy group, Radiometallurgy Division, Bhabha Atomic Research Centre, Trombay, Bombay

    Roy, PR
    Head of post irradiation examination section, scientific officer, scientific officer, scientific officer, scientific officer, and associate director of metallurgy group, Radiometallurgy Division, Bhabha Atomic Research Centre, Trombay, Bombay


    Paper ID: STP25665S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP25665S


    CrossRef ASTM International is a member of CrossRef.