As shown in the figure below (1"x1" area under a 50X magnification microscope), a cold-rolled metal has been annealed at 550 degrees C for one hour. Calculate the ASTM Grain Size Number for the following condition
1. “The grain size of metal sheet influences its formability in two opposing ways. The
yield strength of a metal increases as the grain size decreases. So, the formability of a
component may decrease if the grain size gets too small. Larger grained metals have
better formability, but the roughened surface that results from stretching metal with grain
sizes that are too large is unacceptable for many applications. During a recrystallization
anneal new grains form in the metal. The final grain size depends on the annealing
temperature and annealing time.” As shown in the figure below (1"x1" area under a 50X
magnification microscope), a cold-rolled metal has been annealed at 550 degrees C for one hour. Calculate the ASTM Grain Size Number for the following condition: image attached
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