Effect of Solute Drag and Precipitate Pinning on Austenite Grain Growth in Ti-Nb Microalloyed Steels

摘要：

A metallurgical model concerning the co-effect of the Nb solute drag and the complex carbonitride precipitates pinning is proposed to predict the recrystallization austenite grain growth of low carbon Nb-containing microalloyed steels. The analysis, both predicted and experimental, reveals the precipitate pinning plays a dominate role in suppressing the austenite grain growth with less Nb solute drag effect in high temperature region whereas the Nb solute drag predominates in relatively low temperature region. A factor p is suggested to assess the effectiveness of drag and pinning.The pinning and the drag are more effective in restraining grain growth as p>0 and p<0, respectively. A low carbon Nb microalloyed steel and a kind of Ti-modified low carbon Nb steel by Ti substituting for part of Nb are employed to validate the modeling results. The theoretical calculations show a good agreement with experimental results.

关键词： Grain growth Precipitates pinning Solute drag Ti-Nb microalloyed steels

作者: FU Li-ming WANG Huan-rong WANG Wei SHAN Ai-dang

作者单位: School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China Department of Structural Steels, Baosteel Research Institute, Shanghai 201900, China

会议类型: 国际会议

会议名称: The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)

会议地点: 北京

会议语种:英文

页码: 525-528

在线出版日期: 2011-05-31（万方平台首次上网日期，不代表论文的发表时间）