Micro Hole Piercing for Ultra Fine Grained Steel
Takafumi Komatsu*, Hitoshi Kobayashi*, Shiro Torizuka**,
and Shin-ichi Nagayama***
*Komatsuseiki Kosakusho Co., Ltd., 942-2 Shiga, Suwa-city, Nagano 392-0012, Japan
**National Institute for Material Science, 1-2-1 Sengen, Tsukuba-city, Ibaraki 305-0047, Japan
***Tokushu Kinzoku Excel Co., Ltd., 56 Tamagawa, Tokigawa-machi, Hiki-gun, Saitama 355-0342, Japan
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