在实验室研制了不同Ti、Nb含量的热轧钢板,并对钢板进行了轧后冷却试验,研究了Ti、Nb微合化和热轧工艺对钢板组织和力学性能的影响.在实验室研究基础上,采用微合金化工艺路线,通过控轧控冷工艺,终轧后层流冷却工艺(卷取温度采用590℃),成功试制了700 MPa级工程机械用钢.结果显示,试验钢的屈服强度大于700 MPa,抗拉强度大于785MPa,并具有良好的冲击性能、成形性能.试验钢的组织为铁素体+少量珠光体+微量马氏体,同时,在铁素体的基体上存在大量纳米级的弥散析出或相间析出的(Nb,Ti) (C,N)析出相,有效提高了试验钢的强度.
参考文献
| [1] | Masato KURITA;Miyuki YAMAMOTO;Kazuo TOYAMA;Shigeki NOMURA;Kazutoshi KUNISHIGE .Effects of Strengthening Mechanisms on Fatigue Properties of Ferrite-Pearlite Hot-rolled Sheet Steel[J].ISIJ International,1996(4):481-486. |
| [2] | 雍岐龙.钢铁材料中的第二相[M].北京:冶金工业出版社,2006 |
| [3] | 毛新平,孙新军,康永林,林振源.薄板坯连铸连轧Ti微合金化钢的物理冶金学特征[J].金属学报,2006(10):1091-1095. |
| [4] | Lee J S;Park Y K .Nb(C,N) precipition kinetics in the bainite region of a low-carbon Nb-microalloyed steel[J].Scripta Materialia,2007,57:109-112. |
| [5] | Fernandez AI;Rodriguez-Ibabe JM;Lopez B .Relationship between the austenite recrystallized fraction and the softening measured from the interrupted torsion test technique[J].Scripta materialia,1999(5):543-549. |
| [6] | 张瑞祥 .宝钢钒-钛-铌微合金钢种的开发研制[J].上海金属,1995,17(02):45-48. |
| [7] | H. S. Zurob;C. R. Hutchinson;Y. Brechet;G. Purdy .Modeling recrystallization of microalloyed austenite: effect of coupling recovery, precipitation and recrystallization[J].Acta materialia,2002(12):3075-3092. |
| [8] | Enomoto M;Yang Z G .Equilibrium Shape of TiN in Iron[J].ISIJ International,2004,44:1454-1456. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%