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Product Abstract

Cracking and Disbonding of Hardfacing Alloys in Combined-Cycle Plant Valves

Product ID:1025658
Date Published:29-May-2012
Sector Name:Generation
Document Type:Supplemental Projects
Price:No Charge

This Product is publicly available. This report or any part of this report may NOT be copied, reproduced, republished, uploaded, posted, transmitted or distributed in any way without EPRI's prior written consent.

   71.63 KB - Adobe PDF (.pdf)

Hardfacing alloys such as Stellite 6 often are used on the surfaces of valves in high-pressure, high-temperature steam piping systems of heat-recovery steam generators (HRSGs). These surface layers normally are applied to low alloy Grade 22 steels or martensitic Grade 91 steels using welding processes. The resultant structures are complex due to factors such as variations in the local metallurgy, specifics of the welding process and differences in geometry. Service experience has shown that many of these hardfacing layers have failed. These failures typically are characterized by significant cracking and disbonding (liberation) of this hardfacing layer from the valve body and discs. In some cases, these failures have caused damage to screens and high-pressure steam turbine blades.
2012 Program 87   Fossil Materials and Repair
  • Alloys
  • Valves
  • Disbondiing
  • Hardfacing

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