鉄と鋼
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
くり返しせん断変形加工した極低炭素鋼の特性
小豆島 明青木 孝史朗井上 毅
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ジャーナル フリー

2001 年 87 巻 12 号 p. 762-766

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Ultrafine grained microstructure was produced by repetitive deformation using the side-extrusion method from ultra low carbon steel with an initial grain size of about 150 μm. The repetitive deformations were imposed at a low extrusion speed of 2 mm/min at room temperature. The side-extrusions with lateral pressure were repeated up to 10 passes without rotation. The sample was uniformly deformed by the side-extrusion, and the equivalent strain was 1.15 after a single pass of the side-extrusion. The ultimate tensile strength increased from 200 MPa with an increasing number of side extrusion passes. After 10 passes of side-extrusion, an ultrafine grained steel with a tensile strength of over 1000 MPa and a grain size of 0.5 μm ×0.2 μm was developed.

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