项目名称: 金属/纳米氧化物合金化方法增强高强钢焊缝的工艺及机理研究
项目编号: No.51304059
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: 陈翠欣
作者单位: 河北工业大学
项目金额: 25万元
中文摘要: 高强微合金钢在焊接过程中存在焊缝金属难以在相同化学成分下与母材具有良好匹配的问题,因此采用新型合金化方式来细化、均匀化及洁净组织是改善焊接接头性能的关键。本项目提出新型金属-纳米氧化物合金化方法,以计算材料学和相变理论为基础,对金属-氧化物合金体系进行热力学平衡计算及焊接非平衡条件下相变规律试验,确定最优金属-氧化物合金体系;采用机械和化学表面改性方法对纳米氧化物进行预处理,设计并优化有机/无机-纳米氧化物涂层溶液配方及涂层制备工艺,通过纳米复合涂层技术实现焊芯/焊丝表面涂层制备,研究纳米氧化物在焊接高温中的化学冶金过程,分析其过渡特性,探讨涂层对焊接工艺及力学性能的影响;研究新型金属-氧化物合金化方法对晶粒尺寸、相变特性及成分净化的作用,实现对焊缝组织的控制及性能的优化,为开发高质量焊接材料提供技术保证,从而实现绿色、环保、低能耗焊接。
中文关键词: 高强钢;纳米氧化物;针状铁素体;相变特性;强韧化
英文摘要: There exist some problems for weld joint of high strength steel, such as the different chemical composition of weld deposits with steel. So using new alloying ways to refine, uniform and purify microstructure is the key to improve the welding joint performance. The metal-nanoxides alloying method will be put forward in this study. Based on computational materials science and phase transformation theory, the equilibrium thermodynamic behavior of metal-oxide alloying systems will be calculated and the phase transformation under non-equilibrium welding conditions will be analyzed, which can be used to optimize metals and oxides alloying system. After pretreating to the adopted nonmaterial through mechanical and chemical dispersion technology, the welding materials with nanomaterial layer will be prepared using nano-composite coating method. The metallurgical reactions and transition characteristics of nonmaterial will be analyzed. The effects of nanoparticles and nanocoating parameters on welding process performance and mechanical properties will be discussed. The role of new type of metal oxide alloying will be studied to achieve microstructure control and performance optimization of welding joint which will meet the requirements of the new type steel.In addition,the research will help to develop high quaility wel
英文关键词: high strength steel;nano oxide;acicular ferrite;phase transformation;strengthening and toughening mechanism