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| Experimental Study on Crack Formation of Micro-Alloyed Steel During Hot Charging Process |
| XIA Wen-yong1,2，ZHU Zheng-hai3，GAN Yong3 |
（1. Institute for Structure Materials, Central Iron and Steel Research Institute, Beijing 100081, China
2. Steelmaking Plant, Xinyu Iron and Steel Co.， Ltd., Xinyu 338001, Jiangxi, China
3. National Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081, China） |
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Abstract Based on experimental investigation of precipitates behavior, formation mechanism on crack of Micro-alloyed steel during hot charging process was analyzed by binding micro-structural evolution and thermal stress changing. The results show that different convey way and hot charging temperature have significantly effect on precipitates behavior in charging slab. But the status of precipitates in reheating slab is similar when convey way sand hot charging temperatures are different. The hot charging process crack of micro-alloyed steel was formed by resultant force of precipitates behavior, micro-structural evolution and thermal stress changing. The micro-structural evolution that is the formation of proeutectoid ferrite omentum on austenitic grain boundaries in Ar1-Ar3 is the leading role on formation of hot charging process crack.
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Received: 22 June 2011
Published: 15 December 2011
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2011, Vol. 46 
