Ti和Ti-V微合金化低碳贝氏体钢组织性能及析出行为的研究  

Effect of Ti and Ti-V Microalloyed on Precipitation Behaviors,Microstructure and Properties of Low Carbon Bainitic Steel

作　　者：李晓林[1] 蔡庆伍[2] 赵运堂[1] 崔阳[1] 

机构地区：[1]首钢技术研究院,北京100043 [2]北京科技大学冶金工程研究院,北京100083

出　　处：《材料工程》2015年第6期52-59,共8页Journal of Materials Engineering

摘　　要：利用场发射扫描电子显微镜(FE-SEM)、高分辨透射电子显微镜(HRTEM)和能谱仪(EDS)等,研究了不同Ti含量的低碳贝氏体钢的显微组织和析出相的成分、尺寸、形貌以及分布等特征。结果表明:在450℃和520℃保温2h,三种实验钢组织为粒状贝氏体。与低Ti实验钢相比,高Ti及Ti-V复合实验钢的屈服强度增加了150MPa以上。高Ti钢中纳米级析出相有两种类型:一种大于15nm的TiC析出相;另一种是在10nm以下,具有面心立方结构的(Ti,Mo)C复合析出相。Ti-V钢基体中存在大量尺寸在10nm以下的(Ti,V,Mo)C复合析出相。The morphology,size,distribution and chemical composition of precipitates and the microstructure of the low carbon bainitic steel with different content of Ti were investigated by field emission scanning electronic microscopy （FE-SEM）,high resolution transmission electron microscope （HR-TEM） and energy disperse spectroscopy （EDS）.The results show that the test steels holding at 450℃ and 520℃ for 2h,the microstructure of three kinds of steels is granular bainite.Compared with the low titanium steel,the yield strength of the high titanium steel and titanium-vanadium steel increases by over 150MPa.There are two kinds of the nanometer-sized precipitate particles in high titanium steel：one of these is titanium carbide,which size is more than 15nm.The other is composite precipitate with the FCC（face-centered cubic）-（Ti,Mo）C structure,which size is smaller than 10nm.In the matrix of titanium-vanadium steel,there are a great amount of （Ti,V,Mo）C composite precipitates with the size smaller than 10nm.

关 键 词：粒状贝氏体 纳米级析出相 位错线 (Ti Mo)C (Ti V Mo)C 

分 类 号：TG142.1[一般工业技术—材料科学与工程]