Creep: Microstructure & preventive action

Creep is one of the deterioration mechanisms that could be detected by in-situ metallography.

  i)  Sketch the schematic diagram the microstructure of steel that experienced creep.

 ii)  Give your idea of the metallurgical design solutions that should be carried out to prevent a creep failure.

Answer

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i)  

Schematic diagram of creep microstructure 

ii)   Creep can be prevented by

Reduce the effect of grain boundaries: 

• Use single crystal material with large grains.

• Addition of solid solutions to eliminate vacancies. 

Employ materials of high melting temperatures.

Apply a new technology of ceramic thermal barrier

Consult Creep Test Data during materials Selection

• Type of service application

• Set adequate inspection intervals according to life expectancy.