


Crankshaft
This micrograph shows the structure of a forged, machined crankshaft made from medium-carbon steel containing about 0.50% carbon. Though a small amount, this carbon dramatically increases the strength of the iron. The image displays light yellow areas of ferrite (pure iron) alongside darker regions of pearlite—a layered mix of iron and iron-carbide. This balanced structure provides the durability and toughness needed to withstand rotational stress over millions of cycles.
Raymond Thompson MAG. 500x
This micrograph shows the structure of a forged, machined crankshaft made from medium-carbon steel containing about 0.50% carbon. Though a small amount, this carbon dramatically increases the strength of the iron. The image displays light yellow areas of ferrite (pure iron) alongside darker regions of pearlite—a layered mix of iron and iron-carbide. This balanced structure provides the durability and toughness needed to withstand rotational stress over millions of cycles.
Raymond Thompson MAG. 500x