English: Secondary electron image of a polished and etched section of a steel helical gear. Microstructure consists of pearlite in a ferrite matrix. Etched in 3% nital. 2000X.
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{{Information |Description={{en|1=Secondary electron image of a polished and etched section of a helical gear. Microstructure consists of pearlite in a ferrite matrix. Etched in 3% nital. 2000X.}} |Source=McGill University |Author=[[User:Michelshock|Mi
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