工程科学学报2016，Vol.38Issue(z1)：8-13,6.DOI:10.13374/j.issn2095-9389.2016.s1.002
低碳含硼钢中BN的析出行为
Precipitation behavior of BN in low carbon boron-bearing steel
史成斌 1李晶 1余璐 1祁永峰 1刘伟建 1张志明2
作者信息
- 1. 北京科技大学钢铁冶金新技术国家重点实验室，北京100083
- 2. 广东省韶关钢铁集团有限公司，韶关512123
- 折叠
摘要
Abstract
The low carbon boron-bearing steel with 0. 0045% boron and 0. 0039% nitrogen was investigated, the thermodynamics and kinetics of precipitation and growth of BN during liquid steel solidification were studied. The effect of cooling conditions on the precipitation and growth of BN was experimentally investigated. The results show that BN can only precipitate at the solidifying front where the solid fraction is greater than the calculated critical value of 0. 981 due to the segregation of boron and nitrogen. There is a serious segregation of boron and nitrogen with the increase of the solid fraction at the solidifying front. The diffusion of nitrogen in liquid steel is the rate-controlling step of BN growth because the boron content in the remaining liquid steel is much higher than that of nitro-gen when the solid fraction is close to 1. The change in cooling rate of liquid steel has negligible effect on the segregation of boron and nitrogen. However, the size of BN precipitates decreases greatly with increasing the cooling rate.关键词
含硼钢/析出/长大/冷却速率/固相率/微观偏析Key words
boron-bearing steel/precipitation/growth/cooling rate/solid fraction/microsegregation分类
冶金工业引用本文复制引用
史成斌,李晶,余璐,祁永峰,刘伟建,张志明..低碳含硼钢中BN的析出行为[J].工程科学学报,2016,38(z1):8-13,6.
