材料工程Issue(3)：16-21,26,7.DOI:10.3969/j.issn.1001-4381.2013.03.004
N含量对Cr-Mo-V系超低碳贝氏体钢组织性能和析出行为的影响
Effect of Nitrogen Content on Precipitation Behavior,Microstructure and Properties of Cr-Mo-V Ultra-low Carbon Bainitic Steel
摘要
Abstract
The morphology, size, distribution and chemical composition of precipitates and the micro-structure of the ultra-low carbon bainitic steel with three different nitrogen contents were investigated by optical microscope (OM), scanning electron microscope(SEM) , transmission electron microscope (TEM) and energy disperse spectroscopy (EDS). The results show that the microstructure of the steel with low nitrogen content is granular bainite, while the steel with high nitrogen content is granular bainite as well as some acicular ferrite. When the value of V/N is 3. 4, the yield strength and ultimate strength increase by 231MPa and 95MPa, respectively, which is attributed to precipitation strengthening and fine-grain strengthening. Compared with the low nitrogen steel, the high nitrogen steel can obtain finer bainitic ferrite lathes, the number of precipitates increases and the size decreases. There are two kinds of different sizes of the nanometer-sized precipitate particles in matrix, one of these are vanadium carbonitride, which are the range of particle sizes from 10nm to 15nm and distributed within bainitic ferrite lathes. The other precipitates are smaller than 10nm enriched with Cr and V. It seems that this carbide can maintain the NaCl-type of structure.关键词
超低碳贝氏体钢/沉淀强化/力学性能/纳米级析出相Key words
ultra-low carbon bainitic steel/precipitation strengthening/mechanical property/nanometer-sized precipitate分类
矿业与冶金引用本文复制引用
李晓林,蔡庆伍,余伟,张恒磊..N含量对Cr-Mo-V系超低碳贝氏体钢组织性能和析出行为的影响[J].材料工程,2013,(3):16-21,26,7.基金项目
国家自然科学基金项目(51274036) （51274036）
