N610E级石油储备罐用钢（12MnNiVR）常用加热调质处理工艺生产。利用OM、TEM等试验方法,研究了石油储罐用钢N610E直接淬火后,不同回火温度对组织和力学性能的影响。结果表明：直接淬火钢经655℃回火,钢板具有最佳综合力学性能,其抗拉强度640 MPa,屈服强度570 MPa,伸长率22%,-20℃冲击功273 J,不同回火温度的N610E钢韧脆转变温度均在-60℃以下。随回火温度的升高,板条贝氏体回复作用逐渐加强,位错通过运动、合并、重组,相邻板条合并,组织粗化;回火后钢的力学性能变化趋势的非单调性,归因于回火过程贝氏体中位错亚结构的回复软化与碳的脱溶及第二相的析出强化机制综合作用。
N610E grade steel（12MnNiVR） for oil storage tank is normally produced by reheating quenching and tempering process.Effects of tempering temperature on the microstructure and mechanical properties of the direct-quenched N610E steels were investigated by OM,TEM and other experimental methods.The results indicate that： after direct quenched and tempered at 655 ℃,the tested steel obtains the optimum comprehensive mechanical properties with tensile strength of 640 MPa,yield strength of 570 MPa,elongation of 22% and impact energy of 273 J at-20 ℃,brittle transition temperature of N610E steel tempered at different temperature are lower than-60 ℃.The recovery of lath bainite becomes gradually obvious with increasing tempering temperature through motion,merging and reorganization of dislocations,which cause lath wider.Mechanical properties variation with tempering temperature shows non-monotonic nature,which attributes to the comprehensive mechanism including recovery and softening process of substructure,and the strengthening mechanism due to carbon dissolution and the second phase precipitation in bainite during tempering.
参考文献
| [1] | Chiaki OUCHI .Development of Steel Plates by Intensive Use of TMCP and Direct Quenching Processes[J].ISIJ International,2001(6):542-553. |
| [2] | 姚连登,赵四新,赵小婷,李红斌.直接淬火研制800MPa级低焊接裂纹敏感性高强钢厚板[J].材料热处理学报,2009(03):132-136. |
| [3] | 梁晓军,焦四海,王聪,姜洪生.回火工艺对直接淬火钢组织与性能的影响[J].热加工工艺,2006(16):47-50. |
| [4] | 苏春霞,王勇,张起生.轧制-直接淬火参数对Ti-B微合金化低碳Si-Mn钢组织和性能的影响[J].特殊钢,2009(01):60-62. |
| [5] | Hwang Guen-chul;Lee Sunghak;Yoo Jang-yong et al.Effect of Direct Quenching on Microstructure and Mechanical Properties of Copper-Bearing High-Strength Alloy Steels[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1998,252:256. |
| [6] | Chang Woong-seong .Microst Ructure and Mechanical Proper-ties of 780MPa High Strength Steel Produced by Direct-Quenching and Tempering Process[J].Journal of Materials Science,2002,37:1973. |
| [7] | 雍岐龙.钢铁材料中的第二相[M].北京:冶金工业出版社,2006 |
| [8] | 康军艳,余伟,陈银莉.回火工艺对针状铁素体钢组织和性能的影响[J].钢铁,2006(09):65-69. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%