连铸坯角部横向裂纹是连续铸钢过程中经常出现的缺陷，直接影响钢材质量和生产成本.以 AH36钢为研究对象，采用 Gleeble-3800热模拟机模拟连铸坯冷却制度对连铸坯的影响.借助金相显微镜对断口微观组织进行分析表征，研究不同冷却温度下试样的热延展性，明确冷却温度对连铸坯角部横裂纹的影响.结果表明：以10℃/s 的冷速冷却至650℃后，回温至Ac3温度以上随后再缓慢冷却至825℃时的试样断面收缩率为67.02％，并且微观组织均匀，晶粒细小.热循环冷却制度能够有效提高连铸坯表面热延展性，降低裂纹敏感性，消除角部裂纹的产生.
Slab transverse corner crack is a common defect in continuous casting process,It directly affects the qu-ality of steel and the cost of production.Taking the AH36 steel as the research object,the effect of cooling system on continuous casting billet was studied by Gleeble-3800 thermal simulation machine.By using the optical micros-copy,fracture microstructure characterization was represented to study the hot ductility of the samples at different cooling temperatures and to define the effect of cooling rate on the transverse corner cracks.The results show that after the samples are cooled to 650 ℃ at 10 ℃/s,then temperature back to above Ac3 then slowly cooled to the temperature of 825℃,the reduction of area of the sample is 67.02% and the microstructure is uniform with fine grain.Thermal cycling cooling system can effectively improve hot ductility on the the surface of continuous casting billet,reduce crack sensitivity,and eliminate the corner cracks.
参考文献
| [1] | 白锦函;刘社牛;吴静;樊建刚;董浩.高强度船板AH36的断口不合原因分析[J].河南冶金,2009(3):25-26,49. |
| [2] | 许孟春;李德军;张宁.连铸板坯角部横裂纹产生原因与控制[J].鞍钢技术,2015(2):9-14,19. |
| [3] | 马范军;文光华;唐萍;韩靖.含铌、钒、钛微合金钢连铸坯角部横裂纹研究现状[J].材料导报,2010(5):89-91,95. |
| [4] | 梁建平;刘旭峰;王立新;翟启杰.冷却速率对1Cr18Ni9Ti钢高温力学性能的影响[J].钢铁,2007(3):56-59. |
| [5] | 陈忠伟;王晓颖;张瑞杰;介万奇.冷却速率对A357合金凝固组织的影响[J].铸造,2004(3):183-186. |
| [6] | 马范军;文光华;唐萍;徐国栋;梅峰.冷却速度对含铌、钛微合金钢铸坯表层组织结构的影响[J].北京科技大学学报,2009(9):1116-1121. |
| [7] | Maurizo VEDANI;David DELLASEGA;Aldo MANNUCCII.Characterization of Grain-boundary Precipitates after Hot-ductility Tests of Microalloyed Steels[J].ISIJ International,20093(3):446-452. |
| [8] | 陈登福;宋立伟;董志华;高兴建;王水根.冷却速率对耐候钢高温力学性能的影响[J].重庆大学学报：自然科学版,2011(11):50-55. |
| [9] | Toru KATO;Yoshiki ITO;Masayuki KAWAMOTO.Prevention of Slab Surface Transverse Cracking by Microstructure Control[J].ISIJ International,200311(11):1742-1750. |
| [10] | N. Baba;K. Ohta;Y. Ito.Prevention of slab surface transverse cracking at Kashima n deg 2 caster with Surface Structure Control (SSC) cooling[J].Revue de Metallurgie: Cahiers d'Informations Techniques,20064(4):174-179. |
| [11] | 马范军 .微合金钢铸坯第二相析出行为及表层组织演变研究[D].重庆大学,2010. |
| [12] | 牛山廷;张兴中;干勇.连铸板坯表面横裂纹形成机理及防止措施[J].特殊钢,2011(1):19-22. |
| [13] | 马江南;杨才福;王瑞珍.变形对微合金钢在两相区变形时显微组织的影响[J].钢铁研究学报,2015(1):55-60. |
| [14] | Barrie MINTZ.The Influence of Composition on the Hat Ductility of Steels and to the Problem of Transverse Cracking[J].ISIJ International,19999(9):833-855. |
| [15] | 张韵;章静;潘红波;于同仁;郭湛.工艺参数对耐蚀钢12CuCrNiV组织与性能的影响[J].钢铁研究学报,2015(10):55-62. |
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