The effect of Nb on the microstructure evolution of low-carbon Mn-series air cooled bainitic steels has been studied by using thermomechanical simulation machine, SEM, and TEM observation. The results show that the amount of ferrites is relatively higher in the steel without Nb than that of Nb-bearing steel under same deformation condi-tions, and the ferrites in Nb-bearing steel are more finer. The mechanical properties of the Nb-bearing steel are higher than those of the steel without Nb at the same finishing rolling temperature (FRT), and the toughness of the Nb-bearing steel is about 100J higher than that of the steel without Nb at the finishing rolling temperature 750℃. The toughness of Nb microalloyed steel will be improved more effectively than that of the steel without Nb with the de-crease of FRT.
参考文献
| [1] | Takehide SENUMA .Present Status of and Future Prospects for Precipitation Research in the Steel Industry[J].ISIJ International,2002(1):1-12. |
| [2] | 王建平,杨志刚,白秉哲,方鸿生,冯勇,徐洪庆.奥氏体形变对仿晶界型铁素体/粒状贝氏体复相钢组织和强韧性能的影响[J].金属学报,2004(03):263-269. |
| [3] | 曹建春,刘清友,雍岐龙,孙新军.铌对高强度低合金钢的组织和强化机制的影响[J].钢铁,2006(08):60-63. |
| [4] | 黄海冰,白秉哲,冯勇,徐洪庆.铌、钛微合金化仿晶界型铁素体/粒状贝氏体复相钢的形变诱导铁素体相变的研究[J].金属热处理,2006(z1):124-129. |
| [5] | Enomoto M;Norjirl V;Sato Y .Effects of Vanadium and Niobium on the Nucleation Kinetics of Preoccupied Ferritc at Austenite Grain Boundaries in Fe-C and Fe-C-Mn Alloys[J].Materials Transactions,1994,35(12):859. |
| [6] | 陈国安,杨王玥,郭守真,孙祖庆.低碳微量铌钢形变过程中动态相变的特点[J].材料热处理学报,2006(06):89-94. |
| [7] | 陈国安,杨王玥,郭守真,孙祖庆.低碳微量铌钢过冷奥氏体形变过程中的碳氮化物析出[J].北京科技大学学报,2005(03):302-306. |
| [8] | B. DUTTA;E. J. PALMIERE;C. M. SELLARS .MODELLING THE KINETICS OF STRAIN INDUCED PRECIPITATION IN Nb MICROALLOYED STEELS[J].Acta materialia,2001(5):785-794. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%