Metallographic Examination – Optical

  • Consists of preparing a sample by sectioning, grinding, polishing, etching and subsequently examining under magnification (in either the as-polished or etched condition).
  • Metallography allows the metallurgist to determine certain characteristics regarding the material, such as quality and response to heat treatment or processing, material cleanliness, grain structure and size, total case depth measurement, casting integrity, Alpha Case, Alloy Depletion, Deleterious Phase Check, Volume fraction, percentage cavitation, structural evaluation, weld quality and coating/plating thickness measurements etc.
  • Routine assessment of the core/surface structure of metallic materials to check specific features against indicated requirements.
  • Aids in the assessment of laser cutting, enabling depth of re-cast layer to be determined.
  • Assesses the process of heat treatment regarding total case depth and case depth quality in steels or furnace integrity/surface contamination in titanium.
  • Ensures thread rolling has been carried out correctly, without the production of deleterious defects such as laps.
  • Ensures materials purchased have the required level of non-metallic inclusions for their intended application.
  • Ensures that the heat treatment of aluminium has been carried out correctly without resulting in high temperature oxidation or incipient fusion.
  • Measures the coating applied to materials with photographic evidence where required.
  • Can be used as a check for vacuum furnace integrity on Titanium alloys (alpha case).
  • Used to support reverse engineering, for determining method of component manufacture.
  • Used in the process of failure investigation to aid in establishing the cause of failure.
  • Carried out at magnifications from x40 up to x1000, using optical and image analysis capabilities.
  • Providing quick and accurate evaluation of microstructure, grain size, cleanliness and volume fraction, nodularity checks and count, deleterious phases etc.
  • Assessment carried out to established standards which may include standard charts and specifications including ASTM E112, ASTM E562, ASTM E45, ASTM A247 etc.

Matthew Mellor

Technical Services Director 

Carl Barker

Test House Manager

Roger Wheatley

Senior Technician NDT

Keith Blower

Technical Director

John Whitaker

Chief Chemist

Tom Varley

Chemical Analysis 

Graham Woodward

Chem Lab Supervisor

General Enquiries

Technical Services

Keighley Laboratories Ltd
Registered Office:
Croft House
South Street
West Yorkshire
BD21 1EG
Registered in England 164811
UK Tel: +44 (0)1535 664211

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