为了研究Al和P合金元素在TRIP钢固态相变过程中的作用,研究了4种不同合金成分C-Mn-Al-P TRIP钢的CCT图.结果表明,Al元素强烈的缩小奥氏体相区,提高A<,c3>与M<,s>.Al元素促使CCT图左移和上移.P元素能够阻碍碳化物的生成,当钢中P含量达到0.14%,能显著的将CCT图中的珠光体区与贝氏体区右移.P元素对铁素体相变和马氏体相变没有显著影响.利用类平衡下切变长大模型估算了4种TRIP钢的B<,s>点(A6钢为567℃,P1钢为556℃,P2钢为514℃,P3钢为548 ℃),与实际测量值吻合较好.研究表明在相同条件下,Al元素降低△μ<'γ→α><,Fe,ch>,即增加相变驱动力,同时还降低△G<'shear><,m,Fe>,即降低切变阻力,提高B.点.P元素增加△G<'shear><,m,Fe>,即增加切变阻力,降低B<,s>点.
参考文献
| [1] | Zackay V F;Parker E R;Fahr D D et al.The enhancement of ductility in high strength steels[J].Transactions of the ASM,1967,60(02):252-259. |
| [2] | Sankaran S;Subramanya S V;Kaushik V et al.Thermomechanical processing and characterization of multi phase microstructures in a V bearing medium carbon microalloyed steel[J].Journal of Materials Processing Technology,2003,139:642-647. |
| [3] | P. J. JACQUES;E. GIRAULT;Ph. HARLET .The Developments of Cold-rolled TRIP-assisted Multiphase Steels. Low Silicon TRIP-assisted Multiphase Steels[J].ISIJ International,2001(9):1061-1067. |
| [4] | Srivastava A K;Bhattacharjee D;Jha G et al.Microstructure and mechanical characterization of C-Mn-Al-Si cold-rolled TRIP-aided steel[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2007,445-446:549-557. |
| [5] | M. De MEYER .The Influence of the Substitution of Si by Al on the Properties ofCold Rolled C-Mn-Si TRIP Steels[J].ISIJ International,1999(8):813-822. |
| [6] | Dong-Woo Suh;Seong-Jun Park;Chang-Seok Oh .Influence of partial replacement of Si by Al on the change of phase fraction during heat treatment of TRIP steels[J].Scripta materialia,2007(12):1097-1100. |
| [7] | De Cooman BC .Structure-properties relationship in TRIP steels containing carbide-free bainite[J].Current opinion in solid state & materials science,2004(3/4):285-303. |
| [8] | 孟延军;关昕.金属学及热处理[M].北京:冶金工业出版社,2008:146-147. |
| [9] | 石霖.合金热力学[M].北京:机械工业出版社,1992:285-331. |
| [10] | 俞德刚;王世道.贝氏体相变理论[M].上海:上海交通大学出版社,1998:202-266. |
| [11] | JIAJUN WANG;SYBRAND VAN DER ZWAAG .Stabilization Mechanisms of Retained Austenite in Transformation-Induced Plasticity Steel[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2001(6):1527-1539. |
| [12] | 王世道;俞德刚 .Fe-C合金贝氏体相变热力学研究[J].金属学报,1989,25(04):257-263. |
| [13] | 于燕,刘相华,王华,刘辉,孙艳坤.汽车用高强度钢板强化机理研究[J].汽车工艺与材料,2006(07):12-13,16. |
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