亚微米/纳米晶中碳铁基合金的变形行为与力学性能研究

项目名称： 亚微米/纳米晶中碳铁基合金的变形行为与力学性能研究

项目编号： No.51474092

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 冯运莉

作者单位： 华北理工大学

项目金额： 83万元

中文摘要： 本项目以提高亚微米/纳米晶中碳铁基合金的应变强化能力为研究重点，通过优化与调控亚微米/纳米晶中碳铁基合金的微观组织结构，达到强度和塑性最优组合的目的，实现强韧化。主要研究退火温度和保温时间对亚微米/纳米晶中碳铁基合金组织演变的影响规律，揭示碳化物颗粒尺寸和分布对强度、塑性和均匀延伸率的影响机理；通过对SPD变形及不同工艺热处理的亚微米/纳米晶中碳铁基合金变形行为和力学性能的研究，揭示亚微米/纳米晶中碳铁基合金的微观变形机制及其对应变强化能力和力学性能的作用机理，确定获得强度和塑性最优组合的组织状态；探讨亚微米/纳米晶中碳铁基合金的晶体学取向分布（织构）、取向差分布及其对力学性能尤其是对冲击韧性的影响规律，验证亚微米/纳米晶中碳铁基合金是否存在韧性各向异性，确立相关材料断裂行为的晶体学特征。本项目研究成果可为亚微米/纳米晶中碳铁基合金的实际工程应用提供理论基础和技术支撑。

中文关键词： 中碳铁基合金；亚微米/纳米晶；变形行为；变形机制；力学性能

英文摘要： Improving the strain hardening of submicron/nanocrystalline carbon iron-based alloys with medium carbon will be the research emphases in this project, by optimizing and regulating the microstructure, to achieve the optimal match of strength and ductility. Effect of annealing temperature and time on microstructure evolution will be studied, and reveal the influence mechanism of carbide particle size and distribution on the strength, ductility and uniform elongation. Deformation behavior and mechanical properties of submicron/nano-crystalline iron-based alloys with medium carbon after SPD deformation and different heat treatments will be studied, and reveal microscopic deformation mechanisms and the effect for the strain hardening and mechanical properties, to determine the microstructure to get the optimal combination of strength and ductility. Crystallographic orientation distribution(texture) of submicron/nano-crystalline iron-based alloys with medium carbon, misorientation distribution, which the effect on the mechanical properties especially the impact toughness will be discussed. Verifying whether there exists toughness anisotropy, establishing crystallographic characteristics of fracture behavior in submicron/ anocrystalline iron-based alloys with medium carbon. The reasearch result in this project will provide a theoretical basis and technical support for practical application of submicron/nano-crystalline iron-based alloys with medium carbon.

英文关键词： iron-based alloys with medium carbon;submicron / nanocrystalline;deformation behavior;deformation mechanism;mechanical properties