学术论文

      A105连铸坯表面横裂纹形成原因分析

      Surface transverse crack formation study of A105 continuous casting billets

      摘要:
      应用配有能谱仪的场发射扫描电镜分析了 A105钢中裂纹处及基体内残余元素 Cu、As和 Sn以及 P含量。应用Thermo-Calc热力学计算软件计算了A105钢的主要析出相以及钢液中P含量随固相质量分数变化关系。应用Gleeble 1500热模拟试验机对A105钢的高温热塑性进行了研究。发现P偏析是该钢产生横裂的主要原因,残余元素Cu、As和Sn在晶界的偏聚加剧了裂纹的形成,矫直温度偏低加速了裂纹的扩展,而裂纹的形成可能与AlN的析出无关,因为析出的AlN很少。
      Abstract:
      The contents of tramp elements Cu, As and Sn as well as P in A105 continuous casting billets were analyzed by field emission scanning electron microscopy ( FESEM) equipped with energy dispersive spectrometry ( EDS) . Main precipitates in the steel and the variation of P content in molten steel with solid fraction were calculated by Thermo-Calc thermodynamic software. The hot ductility of the steel was measured by using a Gleeble 1500 thermal simulator. It is found that P segregation is the main reason for transverse cracking of the steel. The segregation of tramp elements Cu, As and Sn at grain boundaries promotes the formation of cracks. Straightening in a lower temperature zone accelerates crack propagation. AlN precipitation may have nothing to do with the formation of cracks due to little AlN.
      作者: 陶素芬 [1] 王福明 [1] 李梦龙 [1] 金桂香 [1] 曹敏 [1] 柴国强 [2]
      Author: TAO Su-fen [1] WANG Fu-ming [1] LI Meng-long [1] JIN Gui-xiang [1] CAO Min [1] CHAI Guo-qiang [2]
      作者单位: 北京科技大学钢铁冶金新技术国家重点实验室,北京100083; 北京科技大学冶金与生态工程学院,北京100083 北京有色金属研究总院,北京,100088
      刊 名: 北京科技大学学报 ISTICEIPKU
      年,卷(期): 2014, (1)
      分类号: TF777.2
      机标分类号: TF7 TG1
      在线出版日期: 2014年2月16日
      基金项目: 国家自然科学基金资助项目,中央高校基本科研业务费专项资金资助项目