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Single-pass severe plastic forming to manufacture products with superfine functions

单道次严酷塑性成型，制造超精细功能产品

基本信息

批准号：
16360357
负责人：
YANAGIMOTO Jun
金额：
$ 10.02万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

项目摘要

We developed an extrusion process with a cross-sectional area reduction as 'single-pass severe plastic forming (S2PF)' process for producing ultrafine-grained plain carbon steels. We investigated the microstructure and mechanical properties of fine-grained 0.2% carbon steels extruded at 1100-600℃. Ultrafine ferrite grains with a grain size of 1.2 micro meter were generated at the surface of the materials extruded at 700℃. The materials extruded at 800, 700 and 600℃ were investigated by scanning electron microscopy, electron backscattering diffraction analyses, tensile tests and compression tests. Extrusion at 700℃, which is near the austenite-ferrite transformation temperature (Ar3), produced a material sample with a diameter of 5 mm, an average ferrite grain size of approximately 2 micro meters, a tensile strength of about 700MPa, a uniform elongation of about 15% and a good cold-forging property.An 'single-pass severe plastic forming (S2PF)' is then applied to the forming of composite material. Here, light-weight structural metal, Aluminum A6061, is used as the base metal and multi-walled carbon nanotube (CNT) is selected as the additional material. Uniformly-distributed 1wt% CNT in A6061 matrix is successfully manufactured by the extrusion process, which directly enables compaction and sintering at the same time utilizing 'single-pass severe plastic forming (S2PF)'. Electrical conductivity is measured and it is elevated up to 125% of the matrix base metal A6061.

开发了一种截面积减小的挤压工艺--“单道次剧烈塑性成形（S2 PF）”工艺，用于生产超细晶粒普碳钢。研究了1100-600℃挤压的0.2%细晶碳钢的显微组织和力学性能。在700℃挤压时，材料表面生成了晶粒尺寸为1.2 μ m的超细铁素体晶粒。采用扫描电镜、电子背散射衍射分析、拉伸试验和压缩试验对800、700和600℃挤压的材料进行了研究。在700℃下挤压，这接近于镁橄榄石-铁素体转变温度（Ar 3），产生直径为5 mm、平均铁素体晶粒尺寸约为2 μ m、抗拉强度约为700 MPa的材料样品，均匀延伸率约为15%，冷锻性能良好。然后应用于复合材料的成型。这里，轻质结构金属铝A6061被用作基底金属，并且多壁碳纳米管（CNT）被选择作为附加材料。通过挤出工艺成功地制造了均匀分布在A6061基体中的1wt% CNT，该工艺直接实现了利用“单程剧烈塑性成形（S2 PF）”同时进行压实和烧结。测量电导率，其升高至基体基底金属A6061的125%。