Abstract
THE increase in hardness which occurs with many work - hardened metals when they are subjected to a low - temperature annealing treatment is well known and is made use of in the arts. Mr. E. G. Herbert has now considered, in a paper read recently before the Iron and Steel Institute, the question as to whether it might not be possible to apply some stimulus other than such a heat-treatment to effect a similar result. In a magnetic material a possible means of achieving such an object is to subject the worked metal to repeated changes of magnetic polarity. When this is done, it is shown that the hardness is increased by the magnetic treatment to exactly the same extent as it is by annealing at the optimum temperature.
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T., F. Superhardening Hardened Steel by Magnetic Means. Nature 124, 672 (1929). https://doi.org/10.1038/124672a0
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DOI: https://doi.org/10.1038/124672a0