| 摘要 |
A nanocrystalline bolt, which serves as a high-strength bolt, is manufactured by the steps of compacting powder formed of nanocrystalline metal particles having a nanometer-scale grain size, extruding a resultant compact so as to obtain a rod stock, and subjecting the rod stock to a bolt-forming process (heading, machining, and form rolling) without involvement of heat treatment. Examples of metal material include JIS SUS410, precipitation-hardening-type 13Cr-8Ni-2Mo, and other stainless steels.
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