Nondestructive Degradation Evaluation of Ferritic Steels for High Temperature Applications

  • W. Lempp
  • N. Kasik
  • U. Feller


The assessment of deterioration of ferritic steels as employed for power plant components with respect to creep, softening and embrittlement is achieved mainly by observation of changes in microstructure. The experience gathered in laboratory investigations is outlined. The obtained knowledge can be applied best in field work if metallography by replication techniques is performed. As a valuable supplement hardness measurements can and should be untertaken. Results from measurements of changes of other physical properties are as yet unable to adequately differentiate changes. Preliminary tests in a static magnetic field indicate some potential for a method based on measurements of reversible permeability.


Static Magnetic Field Ferritic Steel Stress Rupture Turbine Rotor Creep Cavity 
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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • W. Lempp
    • 1
  • N. Kasik
    • 1
  • U. Feller
    • 2
  1. 1.BBC Brown Boveri and CieBadenSwitzerland
  2. 2.Federal Office of MetrologyWabern-BernSwitzerland

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