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HIPed Hard Facings For Nuclear Applications -- Materials, Key Potential Defects And Mitigating Quality Assurance Measures

  • : John Sulley1, David Stewart1
  • : 1Rolls-Royce Nuclear
  • : PDF Download
  • : 2016

Abstract

Hard facings are used to provide improved wear, erosion, and corrosion resistance. Traditionally, weld deposition of the hard facing onto a softer substrate has been used. This can result in poor quality micro-structures being created that may not provide the required wear/erosion/corrosion resistance. This can be an issue for Nuclear applications, where if the hard facing is cobalt based, any debris can contribute to the overall plant radiation level. A method to address the poor micro-structure that may be created from weld deposition methods, is to use a HIPed hard facing where a wear surface is created from the solid state. Homogenous, isotropic, finer grained, and defect free microstructures can be created which generally exhibit improved resistance to wear/erosion/corrosion. This paper presents: the benefits that can be achieved with HIPed hard facings, the key defects that may be present, and the quality control measures to prevent defects being present.

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