均热时间对含Ti、Nb微合金元素高强钢固溶规律的影响  

Effect of soaking time on the dissolution of microalloyed elements in high-strength steel containing Ti and Nb

作　　者：薛润东[1] 赵志毅[1] 王明侠[1] 谢建新[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2007年第9期907-910,共4页Journal of University of Science and Technology Beijing

摘　　要：采用相分析和X射线衍射技术,研究了含Ti、Nb等微合金元素的高强钢中碳氮化物的溶解行为.结果表明,加热到1250℃,未均热时,主要是面心立方结构的Ti(CN)、(TiNb)(CN)、TiC析出相;均热时间为45min,部分Ti和Nb继续溶解,析出相转为Ti(CN)、TiC为主,平均颗粒尺寸由300nm增大为323nm,此时Ti、Nb固溶已经达到平衡,固溶率分别为64.2%和85.8%.当保温80min时,析出相含量基本没有变化,但颗粒尺寸有所增加.Dissolution of carbonitride in high-strength steel containing Ti and Nb was investigated by means of phase analysis and X-ray diffraction. The results show that the precipitation phases are fcc Ti（CN）, （TiNb） （CN） and TiC when heated to 1250 ℃ without soaking; but mainly Ti（CN） and TiC when heated to 1 250 ℃ and preserved for 45 min, their size increased from 300 nm to 323 nm, and the dissolution rates of Ti and Nb were 64.2 % and 85.8 % respectively. The content of precipitates extracted from the sample soaked for 80 min was almost the same with that for 45 min, whereas the particle size increased. It indicated that the dissolution process was apparently approaching thermodynamic equilibrium.

关 键 词：高强钢 碳氮化物 均热时间 析出相 X射线衍射分析 

分 类 号：TG335.56[金属学及工艺—金属压力加工]