摘要
用SEM、TEM、XRD和EBSD等手段分析了不同Nb和Ti含量微碳钢第二相粒子的析出行为,研究了析出相对微碳钢组织性能和织构演变的影响。结果表明,微碳钢的析出相主要由尺寸较大的(Nb,Ti)(C,N)复合析出物、尺寸较小的弥散分布的Nb基碳化物和碳氮化物构成;随着Nb、Ti添加量的增加,细小的第二相粒子数量明显增多,并在再结晶过程中强烈抑制<111>//ND纤维织构的发展,尤其是{223}<110>和{111}<110>取向;多边形铁素体基体以及在快冷过程中的马氏体相变确保了低Nb和Ti含量微碳钢的强度与深冲性能的良好匹配。
Precipitation behavior of second phase in two micro-carbon steels with different amounts Of Nb and Ti were investigated using SEM and TEM technique. In the meanwhile, the effect of precipi- tates on microstructure, texture evolution and properties of the micro-carbon steels was investigated by XRD and EBSD technique. Results show that precipitates in the micro-carbon steels were mainly consist- ed of larger size （Nb, Ti）（C, N） composite particles and finer Nb-based carbide and carbonitride dispersed in matrix. With the increasing of Nb and Ti addition the fine second phase particles increased significant- ly, which strongly inhibit the development of 〈111〉fiND fiber texture during recrystallization, especially for {223}〈110〉 and {111}〈110〉 orientation. As for micro-carbon steel with low content of Nb and Ti, a good combination between strength and deep drawing ability can be acquired due to the occurrence of a ma- trix of polygonal ferrite and martensite transformation during fast cooling process.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2015年第10期779-786,共8页
Chinese Journal of Materials Research
基金
江西省科技厅自然(青年)科学基金20144BAB2160012
江西省教育厅科技研究项目GJJ14445资助~~
关键词
金属材料
深冲钢
析出相
织构演变
组织结构
metallic materials, deep drawing steels, precipitate, texture evolution, microstructure
