为了获得Mn含量介于中锰和低锰之间的具有优良性能的低碳低硅钢,设计了本试验钢,利用DIL 805A型热膨胀仪测定了试验钢的Ac1、Ac3及Ms、Mf点,使用拉伸试验机测定了试验钢的力学性能,通过SEM、EBSD及XRD等技术观察了试验钢的组织结构及残留奥氏体量.结果表明:随着退火温度的提高,试验钢的抗拉强度及屈服强度不断升高;伸长率不断降低;残留奥氏体量先下降后保持在4.5％左右.760℃退火后,试验钢获得最佳力学性能,其屈服强度为631MPa,抗拉强度为1173 MPa,伸长率为10.1％.通过试验钢可以发现,当退火温度低于Ac3时,随着退火温度的提高,试验钢的屈服强度与抗拉强度显著升高,伸长率随之下降,这主要是由于淬火后马氏体比例不断增加.
A low carbon and low silicon dual phase steel with different content of Mn was designed.The temperatures of A c1,Ac3,Ms and Mf were tested by use of DIL805A dilatometer.Uniaxial tensile properties of the annealed steel sheet were measured by on a CMT5105 tensile test machine,the microstructure of the tested steel was revealed by means of SEM,EBSD technique and XRD.The results show that with annealing temperature increasing,the tensile strength and yield strength both increase while the total elongation decreases and the 5％ volume fraction of retained austenite remains unchanged.The ultimate tensile strength of 1173 MPa,yield strength of 631 MPa and the total elongation of 10％ are obtained for the steel annealed at 760 ℃.Raising the annealing temperature can significantly improve the yield strength and tensile strength while the elongation decreases,which is mainly due to the increasing proportion of martensite.
参考文献
| [1] | 康永林;陈贵江;朱国明;宋仁伯.新一代汽车用先进高强钢的成形与应用[J].钢铁,2010(8):1-6,19. |
| [2] | 许云波;侯晓英;王业勤;吴迪.贝氏体区等温处理对钒微合金化TRIP钢组织性能的影响[J].材料热处理学报,2012(10):49-54. |
| [3] | 赵征志;牛枫;唐荻;赵爱民;金光灿.超高强度冷轧双相钢组织与性能[J].北京科技大学学报,2010(10):1287-1291. |
| [4] | 张志勤;黄维;高真凤.汽车用第3代先进高强度钢的研发进展[J].特殊钢,2013(1):16-21. |
| [5] | 唐荻;李维;李志超;李辉;陈银莉.淬火温度对马氏体合金钢性能和晶界结构的影响[J].材料热处理学报,2014(8):86-90. |
| [6] | A Nouri;H Saghafian;Sh Kheirandish.Effects of Silicon Content and Intercritical Annealing on Manganese Partitioning in Dual Phase Steels[J].钢铁研究学报（英文版）,2010(05):44-50. |
| [7] | 范倚;王明林;张慧;陶红标;赵沛;李士琦.第三代汽车钢的热塑性及断裂机理[J].北京科技大学学报,2013(5):607-612. |
| [8] | Sugimoto K.;Sakaguchi J..Stretch-flangeability of a High-strength TRIP Type Bainitic Sheet Steel[J].ISIJ International,20009(9):920-926. |
| [9] | Mohammad Reza Akbarpour;A. Ekrami.Effect of ferrite volume fraction on work hardening behavior of high bainite dual phase (DP) steels[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20081/2(1/2):306-310. |
| [10] | 赵征志;佟婷婷;赵爱民;何青;董瑞;赵复庆.1300 MPa级0.14C-2.72Mn-1.3Si钢的显微组织和力学性能及加工硬化行为[J].金属学报,2014(10):1153-1162. |
| [11] | Sayed, A.A.;Kheirandish, S..Affect of the tempering temperature on the microstructure and mechanical properties of dual phase steels[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2012:21-25. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%