A macrograph, or a 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.
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. 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.
- Macrograph EngNet Engineering Dictionary
- Metallographic examinations TEC Eurolab, Accessed 12 May 2008
- 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. Retrieved 2008-05-12.
- Arthur J. McEvily (2001) Metal Failures: Mechanisms, Analysis, Prevention Wiley-IEEE p 90 ISBN 0-471-41436-0
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