Single-pass severe plastic forming of ultrafine-grained plain carbon steel
Single-pass severe plastic forming of ultrafine-grained plain carbon steel
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DOI：
10.1016/j.msea.2007.06.039
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发表时间：
2008-04
期刊：
影响因子：
6.4
通讯作者：
K. Nagato;S. Sugiyama;A. Yanagida;J. Yanagimoto
中科院分区：
文献类型：
--
作者：
K. Nagato;S. Sugiyama;A. Yanagida;J. Yanagimoto
为了生产超细晶粒普通碳钢，我们开发了一种横截面压缩的挤压工艺--单道次强塑性成形(S2PF)工艺。研究了细晶0.2%碳素钢在110 0~6 0 0℃挤压条件下的组织和力学性能。在70 0℃挤压条件下，表面生成了尺寸为1.2μm的超细铁素体颗粒。在接近奥氏体铁素体转变温度(AR3)的70 0℃挤压条件下，获得了直径为5 mm、平均铁素体晶粒度约为2μm、抗拉强度约为700 MPa、延伸率约为15%的材料样品，并具有良好的冷锻性能。
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°C. Ultrafine ferrite grains with a grain size of 1.2μm were generated at the surface of the materials extruded at 700°C. The materials extruded at 800, 700 and 600°C were investigated by scanning electron microscopy, electron backscattering diffraction analyses, tensile tests and compression tests. Extrusion at 700°C, which is near the austenite–ferrite transformation temperature (Ar3), produced a material sample with a diameter of 5mm, an average ferrite grain size of approximately 2μm, a tensile strength of about 700MPa, a uniform elongation of about 15% and a good cold-forging property.