• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructural Refinement and Mechanical Properties of Ferritic Stainless Steel Processed by Equal-Channel Angular Pressing
【24h】

Microstructural Refinement and Mechanical Properties of Ferritic Stainless Steel Processed by Equal-Channel Angular Pressing

机译：相等通道角压加工铁素体不锈钢的微观结构细化与机械性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Ferritic stainless steel (FSS 430) has been deformed by equal-channel angular pressing (ECAP) at room temperature at an equivalent strain (epsilon(vm)) of 1.2 by adopting the route B-c. Microstructural developments were studied by optical microscopy, transmission electron microscopy, and microtexture by electron backscattered diffraction. Typical ultrafine-grains of less 0.2 mu m could be identified. The XRD patterns confirm the presence of a BCC phase alone. An increase in peak broadening is attributed to the reduction of crystallite size and increase of lattice strain arising from deformation during ECAP. The grain refinement takes place through simple shear deformation by elongation of grains, splitting of grains into bands, the subdivision of bands into subgrains by dynamic recovery, and conversion of subgrains into grains by progressive lattice rotation (PLR). Weakly textured rolled ferritic stainless steel is strongly textured at an imposed equivalent strain of 0.6 with the development of ideal shear components of D-2 theta and (E) over bar (theta) for bcc materials. On the second pass of ECAP texture is partially randomized and the intensity of components was decreased and new components of D-1 theta and F-theta are developed due to subdivision of grains into bands, bands into subgrains, and conversion of subgrains into grains of high angle of misorientation by PLR. The yield strength, tensile strength, and hardness are increased almost 1.5 times that of as-received coarse-grained material due to a high degree of grain refinement and an increase in defect density or strain. The yield strength of 687 MPa of as-received material was enhanced to 1093 MPa of ECAPed ferritic stainless steel. However, the material has lost its ductility significantly due to high defect density and a significant amount of non-equilibrium nature of grain boundaries.
机译：铁素体不锈钢（FSS 430）在室温下采用等通道角挤压（ECAP）变形，等效应变（ε（vm））为1.2，采用B-c法。通过光学显微镜、透射电子显微镜和电子背散射衍射研究了微观结构的发展。可以识别出小于0.2μm的典型超细晶粒。XRD图谱证实仅存在BCC相。峰值展宽的增加归因于ECAP过程中晶粒尺寸的减小和变形引起的晶格应变的增加。晶粒细化是通过简单的剪切变形实现的，即晶粒伸长、晶粒分裂成条带、条带通过动态回复细分为亚晶粒，以及通过渐进晶格旋转（PLR）将亚晶粒转化为晶粒。弱织构轧制铁素体不锈钢在0.6的等效应变下具有强织构，bcc材料的理想剪切分量为D-2θ和（E）过棒（θ）。在ECAP的第二道工序中，由于将晶粒细分为条带、条带和亚晶粒，并通过PLR将亚晶粒转化为大角度取向错误的晶粒，织构部分随机化，成分强度降低，形成了新的D-1θ和F-θ成分。由于晶粒高度细化以及缺陷密度或应变的增加，屈服强度、抗拉强度和硬度增加了近1.5倍于粗晶材料。接收材料的屈服强度为687 MPa，ECAPed铁素体不锈钢的屈服强度为1093 MPa。然而，由于高缺陷密度和大量晶界的非平衡性质，材料已显著失去其延展性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号