利用热模拟方法并结合彩色金相和EBSD技术,分析了在线重加热速率对X80管线钢组织中M/A岛的含量和分布的影响规律。结果表明,重加热速率在一定范围内升高,能够有效延迟位错回复、增大碳原子扩散速率,促进残留奥氏体中碳的富集,有利于晶内细小M/A岛的形成。重加热速率由20℃/s升高到50℃/s的过程中,M/A岛的百分含量基本呈现单调上升趋势,其分布位置也开始由晶界为主转变为晶内、晶界同时存在,当重加热速率高于50℃/s后,M/A岛的百分含量开始呈现下降趋势,同时又以晶界分布为主,重加热速率为50℃/s时,M/A岛的含量达到峰值,呈现晶内、晶界同时分布的理想状态。
Effects of re-hearting rate on amount of M/A islands and its distributions of pipeline steel XS0 were investigated by thermal simulation, colour metallography and EBSD. The results indicate that the recovery of dislocation is retarded effectively with the increase of re-heating rate in a specific range. The carbon enrichment in retained austenite, which is favorable for the formation of intragranular tiny M/A island can be promoted by the increase of re-heating rate. With increasing of the re-heating rate from 20℃/s to 50 ℃/s, the M/A island proportion increases and the grain boundary distribution of M/A island gradually changes to the distributions in grains and at grain boundaries. When the reheating rate is higher than 50 ℃/s, the amount of M/A islands exhibits descending tendency, and the distribution of M/A islands is mainly on grain boundaies. When the reheating rate at 50℃/s, the amount of M/A islands reaches the maximum value, and the optimum distribution of M/A islands is observed.
参考文献
| [1] | Bing Liu;X. J. Liu;Hong Zhang .Strain-based design criteria of pipelines[J].Journal of loss prevention in the process industries,2009(6):884-888. |
| [2] | 焦多田,蔡庆伍,武会宾.轧后冷却制度对X80级抗大变形管线钢组织和屈强比的影响[J].金属学报,2009(09):1111-1116. |
| [3] | 王伟,严伟,胡平,王松涛,单以银,杨柯.抗大变形管线钢的研究进展[J].钢铁研究学报,2011(02):1-6. |
| [4] | 郑晓飞,康永林,孟德亮,安守勇,夏佃秀.终轧温度对X80抗大变形管线钢组织性能的影响[J].北京科技大学学报,2011(05):557-562. |
| [5] | 焦多田,蔡庆伍,武会宾,冉旭,任毅.空冷弛豫对X70级抗大变形管线钢组织性能的影响[J].材料热处理学报,2009(05):101-105. |
| [6] | ZHAO Ming-Chun;YANG Ke;SHAN Yi-yin .The effects of thermo-mechanieal control process on microstructures and mechanical properties of a commercial pipeline steel[J].Materials Science and Engineering A,2002,335:14-20. |
| [7] | ZHONG Y;XIAO F;ZHANG J .In situ TEM study of the effect of M/A films at grain boundaries on crack propagation in an ultra-fine acicular ferrite pipeline steel[J].Acta Materialia,2006,54(05):435-443. |
| [8] | Chunming Wang;Xingfang Wu;Jie Liu .Transmission electron microscopy of martensite/austenite islands in pipeline steel X70[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(0):267-271. |
| [9] | 康沫狂;管敦惠;郭成道.低合金高强度结构钢中的M-A组织[J].西北工业大学学报,1979(02):10一14. |
| [10] | 徐祖耀;李学敏 .低碳马氏体形成时碳的扩散[J].金属学报,1983,19(02):83-84. |
| [11] | 刘智恩.材料科学基础[M].西安:西北工业大学出版社,2004 |
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