Machinability is an important issue in the practical use of ultrafine-grained steels. A lot of machinability data have been accumulated for high strength steels such as quench and tempered steels. However, no study has been performed concerning machinability or cutting mechanism for the ultrafine-grained steels. Hence, we have investigated the machinability for an ultrafine-grained steel with a grain size of less than 1 mum.
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