STP1298

    Interactive Effect of Dynamic Strain Ageing with High Temperature Water on the Crack Initiation Behaviour of Reactor Pressure Vessel Steels

    Published: Jan 1997


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    Abstract

    The effect of dynamic strain ageing (DSA) on stress corrosion cracking (SCC) of reactor pressure vessel(RPV) steels has been investigated. The experimental investigation was conducted on an A533B Class 1 steel subjected to slow strain rate test (SSRT) at a nominal strain rate of 2×10-6/s in stagnant primary water at 250°C. Various DSA responses of the steel were achieved by appropriate heat-treatment processes. The evaluation was made under identical environmental conditions. The results demonstrated that DSA enhanced the SCC which was consistently observed only in the steel that was heat-treated to give the most significant DSA hardening effect. The SSRT and fractographic evidence supports the previous observations based on the data analysis, i.e. there was a coincidence of temperature and strain rate between the DSA hardening and the susceptibility to environment-assisted cracking (EAC) of RPV steels. The mechanistic role of DSA and its interaction with other influential variables in the enhancement of SCC are discussed.

    Keywords:

    dynamic strain ageing, environment assisted cracking, stress corrosion cracking, slow strain rate test, reactor pressure vessel steel, A533B, high temperature water


    Author Information:

    Atkinson, JD
    Professor, School of Engineering, Sheffield Hallam University, Sheffield,

    Zhao, Z-j
    PhD Student, School of Engineering, Sheffield Hallam University, Sheffield,

    Yu, J
    Professor, Shanghai Research Institute of MaterialsSchool of Engineering, Sheffield Hallam University, ShanghaiSheffield,


    Paper ID: STP19962S

    Committee/Subcommittee: G01.06

    DOI: 10.1520/STP19962S


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