I have two samples of steel, one that is annealed, and one that is not. Both samples are in the shapes of cylindrical pucks. In both samples, the steel was found to be slightly harder on the inside of the sample than on the outside, but the trend is slightly more noticeable in the un-annealed sample. Any ideas as to why this is? Thanks!
You should make micrographs.
Michael Dahms
Any number of reasons: different steels, different heat treatments, different manufacturing process. What's the microstructure look like? What does un-annealed mean to you?
Because your samples are cut from a bar. The rest is easy.
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