结晶器振动对连铸坯初始裂纹形成影响

doi:10.12068/j.issn.1005-3026.2016.01.012

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (1): 54-58.DOI: 10.12068/j.issn.1005-3026.2016.01.012

结晶器振动对连铸坯初始裂纹形成影响

孟祥宁¹，林仁敢^1,2，杨杰¹，朱苗勇¹

(1. 东北大学材料与冶金学院，辽宁沈阳110819； 2. 宝钢特钢有限公司，上海200940)

收稿日期:2014-11-24 修回日期:2014-11-24 出版日期:2016-01-15 发布日期:2016-01-08
通讯作者: 孟祥宁
作者简介:孟祥宁(1977-)，男，辽宁本溪人，东北大学副教授；朱苗勇(1965-)，男，浙江诸暨人，东北大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(51004031)；中央高校基本科研业务费专项资金资助项目(N140205002).

Effect of Mold Oscillation on Initial Cracks Formation of Continuous Casting Slabs

MENG Xiang-ning¹， LIN Ren-gan^1,2， YANG Jie¹， ZHU Miao-yong¹

1.School of Materials & Metallurgy， Northeastern University， Shenyang 110819， China; 2.Baosteel Special Metals Co.， Ltd.， Shanghai 200940， China.

Received:2014-11-24 Revised:2014-11-24 Online:2016-01-15 Published:2016-01-08
Contact: MENG Xiang-ning
About author:-
Supported by:
-

摘要/Abstract

摘要： 简要分析了振动结晶器内弯月面坯壳受力研究现状，归纳了坯壳初始裂纹的形成原因.在此基础上提出描述伴随结晶器振动的弯月面坯壳受力模型，阐述振动周期内初凝坯壳力学状态.分析表明，振动特定时段内，结晶器振动引起施加于弯月面处初凝坯壳上的机械应力为148.4kPa，而该温度下坯壳高温临界断裂强度仅为119.1kPa，结晶器振动产生的机械应力超过临界断裂强度时极易引发初始裂纹的形成.当结晶器振动速度大于1.61m·min^-1时弯月面处坯壳初始裂纹开始形成，且产生于钢水自由液面以下2.15~5.4mm位置范围.

关键词: 振动结晶器, 初凝坯壳, 初始裂纹形成, 弯曲应力, 临界断裂强度

Abstract: The previous researches on the stress state of initial solidifying shell in oscillation mold and the detailed reasons to clarify the crack formation process were summarized. The mechanical stress caused by mold oscillation has a dominant contribution to the initial cracks formation as a nonnegligible factor， so a new model was proposed to shed light on the influence of mold oscillation on the initial cracks formation. The stress states of the shell were analyzed for an oscillation cycle. The results showed that the mold oscillation plays an important role on the cracks formation because the maximum bending stress in initial solidifying shell can reach to 148.4kPa and the critical fracture strength of the shell is only 119.1kPa. The initial crack will form when the oscillation velocity is higher than 1.61m·min^-1， which is located in the region of 2.15~5.4mm under the free surface of steel in the mold because the critical fracture strength at a certain temperature is exceeded.

Key words: oscillating mold, initial solidifying shell, initial cracks formation, bending stress, critical fracture strength

中图分类号:

TF777

孟祥宁，林仁敢，杨杰，朱苗勇. 结晶器振动对连铸坯初始裂纹形成影响[J]. 东北大学学报:自然科学版, 2016, 37(1): 54-58.

MENG Xiang-ning， LIN Ren-gan， YANG Jie， ZHU Miao-yong. Effect of Mold Oscillation on Initial Cracks Formation of Continuous Casting Slabs[J]. Journal of Northeastern University Natural Science, 2016, 37(1): 54-58.

参考文献

[1]El-Bealy M O.On the formation of macrosegregation and interdendritic cracks during dendritic solidification of continuous casting of steel ［J］.Metallurgical and Materials Transactions B，2014，45(3):988-1017.
[2]Sengupta J，Thomas B G，Shin H J.A new mechanism of hook formation during continuous casting of ultra-low-carbon steel slabs ［J］.Metallurgical and Materials Transactions A，2006，37(5):1597-1607.
[3]孟祥宁，朱苗勇，程乃良.高拉速下连铸坯振痕形成机理及振动参数优化［J］.金属学报，2007，43(8):839-846.(Meng Xiang-ning，Zhu Miao-yong，Cheng Nai-liang.Oscillation marks formation mechanism and oscillation parameters optimization for slab continuous casting with high casting speed ［J］.Acta Metallurgica Sinica，2007，43(8):839-846.)
[4]雷作胜，任忠鸣，阎勇刚，等.软接触结晶器电磁连铸保护渣道的动态压力［J］.金属学报，2004，40(5):546-550.(Lei Zuo-sheng，Ren Zhong-ming，Yan Yong-gang，et al.Mold flux channel dynamic pressure in electromagnetic continuous cating ［J］.Acta Metallurgica Sinica，2004，40(5):546-550.)
[5]Yang J，Meng X N，Zhu M Y.Experimental study on mold flux lubrication for continuous casting ［J］.Steel Research International，2014，85(4):710-717.
[6]Lankford W.Some considerations of strength and ductility in the continuous casting process ［J］.Metallurgical and Materials Transactions B，1972，3(6):1331-1357.
[7]Zang X Y，Wang X D，Ma Y，et al.The shell surface force caused by mould friction during slab continuous casting ［J］.ISIJ International，2008，48(2):170-174.
[8]Schwerdtfeger K，Sha H.Depth of oscillation marks forming in continuous casting of steel ［J］.Metallurgical and Materials Transactions B，2000，31(4):813-826.
[9]Suzuki M，Suzuki M，Yu C H，et al.In-situ measurement of fracture strength of solidifying steel shells to predict upper limit of casting speed in continuous caster with oscillating mold ［J］.ISIJ International，1997，37(4):375-382.
[10]Kobayashi S，Nagamichi T，Gunji K.Numerical analysis of solute redistribution during solidification accompanying δ/γ transformation ［J］.Transactions ISIJ，1988，28(7):543-552.
[11]Li C S，Thomas B G.Thermomechanical finite-element model of shell behavior in continuous casting of steel ［J］.Metallurgical and Materials Transactions B，2004，35(6):1151-1172.
[12]雷新泉.用差分法求解金属凝固传热问题的一个注记［J］.钢铁研究，1992，68(5):35-39.(Lei Xin-quan.Notes on difference solution of heat transfer in metal solidification ［J］.Research on Iron and Steel，1992，68(5):35-39.)

结晶器振动对连铸坯初始裂纹形成影响

Effect of Mold Oscillation on Initial Cracks Formation of Continuous Casting Slabs

RichHTML

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 3

编辑推荐

Metrics

本文评价

[1]	王东红;张淯淳;邸洪双;. 卡罗塞尔卷取机卷取错层问题分析和解决方案[J]. 东北大学学报(自然科学版), 2010, 31(12): 1733-1736.
[2]	马先贵. 渐开线圆柱齿轮强度计算的新方法[J]. 东北大学学报:自然科学版, 1977, -(4): 97-120.
[3]	丁耀武. 螺旋分级机中空轴强度的研究[J]. 东北大学学报:自然科学版, 1965, -(2): 43-55.