What are the origins of the greenish - yellow bands and the black areas ?
Think about the solidification of an alloy like this with large amounts of other elements to move around ...
Then look at the answer.
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This Type 316 stainless steel (18% chromium, 12% nickel, 3%
molybdenum, 2% manganese, and less than 0.08% carbon) has greater
strength and is more stable mechanically than Type 304 (18% chromium,
8% nickel) stainless steel. This specimen has been properly heat
treated and then deeply etched electrolytically in the oxalic acid
solution. It is shown at 200X at left. What are the origins of the greenish - yellow bands and the black areas ? Think about the solidification of an alloy like this with large amounts of other elements to move around ... Then look at the answer.
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