项目名称： 利用旋转弯曲工艺细化和控制金属管材微观组织的机理研究

项目编号： No.51304046

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 矿业工程

项目作者： 张自成

作者单位： 东北大学

项目金额： 25万元

中文摘要： 针对利用现有技术生产的金属管材普遍存在晶粒粗化、微观组织不均匀、微观组织纤维化、及综合力学性能不佳等问题，本项目提出利用管材旋转弯曲工艺细化和控制金属管材的微观组织并改善其力学性能。在旋转弯曲变形过程中，管材内部产生循环往复的拉伸和压缩大塑性变形，研究在此种变形作用下管材微观组织的演变规律，分析变形参数对微观组织结构的影响，确定应变速率及累积等效应变与微观组织演变之间的关系。项目预期将揭示在循环往复的拉伸和压缩大塑性变形作用下金属材料微观组织的演变机理，实现通过控制应变速率和累积等效应变及变形温度等参数细化和控制金属材料的微观组织并改善其力学性能。项目的研究成果对细化和控制管材微观组织、改善其力学性能具有重要意义，而且提出的循环往复的拉伸和压缩大塑性变形是一种全新的大塑性变形工艺，具有较高的理论价值，可以为利用此种新型大塑性变形工艺细化和控制金属材料微观组织，改善其力学性能提供科学依据。

中文关键词： 旋转弯曲变形工艺；大塑性变形；金属管材；微观组织细化和控制；力学性能

英文摘要： The metal tubes produced with the existing technologies are often accompanied with the grain coarsening, uneven microstructure, and microstructure fibrosis as well as poor mechanical properties. In the current project, the tube rotating bending process is newly proposed to refine and control the microstructure as well as improve the mechanical properties of the metal tubes. The cyclic tensile and compressive severe plastic deformation is formed in the metal tubes during the rotating bending process. The microstructure evolution of the metal tubes under this deformation will be investigated. The effect of deformation conditions on the microstructure of metal tubes will be analyzed. The relationships between microstructure evolution and strain rate as well as accumulated equivalent strain will be confirmed. The mechanism of microstructure evolution of metallic material under cyclic tensile and compressive severe plastic deformation will be clarified by carrying out this project. The refinement and control of microstructure as well as the improvement of mechanical properties of metallic materials will be realized by controlling the deformation parameters of rotating bending process. The research results of this project have a great significance on refining and controlling the microstructure as well as improving the

英文关键词： cyclic rotating bending process；severe plastic deformation；metal tube；microstructure refinement and control；mechanical properties