通过3种高线斯太尔摩风冷工艺，分析了返温后冷却工艺对82B盘条组织性能的影响，在2～10℃/s的范围内返温后冷却速率降低到2℃/s，盘条心部马氏体组织基本消除，同时冷速降低，抗拉强度降低，断面收缩率提高。通过热模拟试验，研究了82B在400～600℃相变温度区间的组织转变过程，结果显示，随着保温温度提高和保温时间延长，马氏体带含量不断降低。利用OM、SEM和EPMA等方法研究了盘条纵截面马氏体组织形态，发现盘条心部马氏体带是Mn和Cr等合金元素的富集区。对于高线斯太尔摩风冷工艺，盘条心部马氏体组织控制的核心是返温后采用缓慢的冷却速率，延长保温时间，优化82B盘条的组织性能。
The character of microstructure and property in the segregation of 82B wire with three different stelmor control cooling procedures after tansformation-temperature-rising was researched. between 2-10℃/s, the cooling rate decreased to 2℃/s after transformation of temperature. And for 82B, the kinetics of eutectoid transformation of segregation through thermal simulation in the range of 400-600℃were researched. The longitudinal section segregation microstructure and composition were analyzed by measures such as OM, SEM and EPMA. The thermal simulation results show that the length of martensite segregation bands decreased as holding time increased, and martensite band in the core of wire where the content of elements such as Mn and Cr was higher than matrix because of segregation. Furthermore, Stelmor control cooling experiments in the high speed wire mill confirms that the core of controlling martensite was slow cooling speed procedure in the post-transformation section of cooling line, while the properties of 82B will be optimized.
参考文献
| [1] | Jae Young Park;Kyu Taek Choi;Jerzy A. Szpunar .Effect of Mn negative segregation through the thickness direction on graphitization characteristics of strip-cast white cast iron[J].Scripta materialia,2002(3):199-203. |
| [2] | Yang R;Zhao D L .Effects of Cr,Mn on the Cohesion of theγ-Iron Grainboundary[J].Actamater,2001,58(06):1079. |
| [3] | VERHOEVEN John D.;hypereutectoid steels;microsegregation (banding); .A Review of Microsegregation Induced Banding Phenomena in Steels[J].Journal of Materials Engineering and Performance,2000(3):286-296. |
| [4] | TED F. MAJKA;DAVID K. MATLOCK;GEORGE KRAUSS .Development of Microstructural Banding in Low-Alloy Steel with Simulated Mn Segregation[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2002(6):1627-1637. |
| [5] | Sychkov A B;Zhigarev M A;Yu S et al.Effect of Dendritic Seg-regation in the Continuous-Cast Semifinished Product on the Formation of the Structure of High-Carbon-Steel Wire Rod[J].METALLURGIST,2008,52(05):275. |
| [6] | Teruo YAMASHITA;Shiro TORIZUKA;Kotobu NAGAI .Effect of Manganese Segregation on Fine-grained Ferrite Structure in Low-carbon Steel Slabs[J].ISIJ International,2003(11):1833-1841. |
| [7] | Hanguang Fu;Qiang Xiao;Jiandong Xing .A study of segregation mechanism in centrifugal cast high speed steel rolls[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):253-260. |
| [8] | T.Kraft;Y.A.Chang .Discussion of "Effect of Dendrite Arm Coarsening on Microsegregation"[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,1998(9):2447-0. |
| [9] | T. KAJITANI;J.-M. DREZET;M. RAPPAZ .Numerical Simulation of Deformation-Induced Segregation in Continuous Casting of Steel[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2001(6):1479-1491. |
| [10] | Sivesson P;Hallen G;Widell B .Improvement of Inner Qual-ity of Continuously Cast Billets Using Electromagnetic Stir-ring and Thermal Soft Reduction[J].Ironmaking and Steel-making,1998,25(03):239. |
| [11] | Ralf THOME;Klaus HARSTE .Principles of Billet Soft-reduction and Consequences for Continuous Casting[J].ISIJ International,2006(12):1839-1844. |
| [12] | 朱伦才,刘启龙,王志政,臧红臣.改善AH36钢板坯中心偏析的试验研究[J].钢铁,2012(07):36-39,67. |
| [13] | 吴清明,许伟阳,颜慧成,徐瑞军,刘建,仇圣桃.20CrMnTiH齿轮钢大方坯轧制圆钢宏观碳偏析控制[J].钢铁,2012(05):23-28. |
| [14] | 罗森,朱苗勇,祭程,蔡兆镇.钢连铸过程的溶质微观偏析模型[J].钢铁,2010(06):31-36. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%