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Metallographic Replication Services

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  7. Metallographic Replication Services

Metallography is a non-destructive testing method used to view the microstructure of a component while it is still in place. It can provide in-depth metallographic information, such as evidence of spheroidisation, creep damage, cracking, and grain size. A replica of the component is made at the workplace and then viewed at in the laboratory by our engineers. The quality of in-situ metallographic replicas is comparable to that obtained destructively in laboratories.

IRISNDT applies Metallographic Replication for: 

  • Inspecting aging high-temperature service piping, tubing (boiler tubes and furnaces) and pressure vessels
  • Inspecting vessels or structures potentially exposed to temperatures above their design limits – such as for fire damage assessments
  • Assessing surface flaws (cracks, laminations, seams)
  • Grading older equipment such as pipelines and piping
  • Verifying materials and heat treatment in as-fabricated equipment
  • Verifying compliance with purchasing requirements
  • Classifying the composition of cast irons without sacrificing any components
  • Assessing if components have been properly heat treated

ADVANTAGES​ 

Replication gives information about:

    • The thermal history of the component
    • Approximate high-temperature range and cooling rates
      Possible mechanical properties
    • Crack morphology
    • Material, shape, and object size are not limiting factors for the inspection
    • Prolonged heat exposure
metallographic replication
Metallographic replicas

LIMITATIONS​

  • Adequate access to the component is required
  • Replicating is challenging at temperatures higher than 70 °C (158 °F), or lower than -10 °C (14 °F)
  • This inspection method is highly dependent upon the skill and experience of the technician performing the inspection
  • Surface preparation is essential for the production of an acceptable micrograph