High-temperature failure of a cast soot blower lance tube nozzle

  • T. N. Ackerson
Case Histories

Abstract

A cast stainless steel lance tube nozzle failed prematurely in a brittle manner after one to two years of service. Metallographic examination of the nozzle revealed a Widmanstätten structure, likely resulting from the precipitation of sigma phase. The presence of this structure suggests that the component was exposed to temperatures beyond the specified operating range.

Keywords

brittle fracture CK-20 stainless steel high-tempersture failure sigma phase 

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Copyright information

© ASM International 2005

Authors and Affiliations

  • T. N. Ackerson
    • 1
  1. 1.Materials & Metallurgy Group, Southern Research Automotive DivisionSouthern Research InstituteBirmingham

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