A macrograph or photomacrograph is an image taken at a scale that is visible to the naked eye, as opposed to a micrographic image. It is sometimes defined more precisely as an image at a scale of less than ten times magnification.[1]

Materials science

This term is often applied to a three-dimensional image taken of a material using a low-power stereomicroscope. These images are used in materials science, particularly in the study of stress fractures in metals.[2][3] This method can also be used to assay the fine structure of steel, in a standardized test called the Baumann method that creates a sulfur print showing the amount and distribution of sulfur inclusions through the metal structure.[4]


  1. Macrograph EngNet Engineering Dictionary
  2. Metallographic examinations Archived 2008-10-11 at the Wayback Machine TEC Eurolab, Accessed 12 May 2008
  3. Milan, M.T.; Spinelli, D.; Bose Filho, W.W.; Montezuma, M.F.V.; Tita, V. (2004). "Failure analysis of a SAE 4340 steel locking bolt". Engineering Failure Analysis. 11 (6): 915–924. doi:10.1016/j.engfailanal.2003.12.003.
  4. Arthur J. McEvily (2001) Metal Failures: Mechanisms, Analysis, Prevention Wiley-IEEE p 90 ISBN 0-471-41436-0

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