1 Department of Mechanical and Electrical Engineering, Tangshan University, Tangshan 063000, Hebei, China 2 State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China 3 National High Magnetic Field Laboratory, Florida State University, Tallahassee 32310, USA
Relationship between secondary dendrite arm spacing and local solidification time of 30Cr2Ni4MoV alloy at slow cooling rates
1 Department of Mechanical and Electrical Engineering, Tangshan University, Tangshan 063000, Hebei, China 2 State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China 3 National High Magnetic Field Laboratory, Florida State University, Tallahassee 32310, USA
摘要 Solidification process of 231 t 30Cr2Ni4MoV ingot manufactured by slow cooling process was studied using experimental and numerical simulations, which tackled the problems of high cost and long period in large ingot studying. Based on the numerical results of large ingot, five characteristic locations under different temperature gradients and cooling rates chosen from the large ingot were simulated. The experiments were performed under the same temperature conditions as in numerical simulations with specialized instrument. The influences of temperature gradient in the solid–liquid interface and solidification rate on the size and morphology of solidification structure were analyzed at cooling rate ranging from 10-3 to 10-2 C s-1. Solidification macrostructure and microstructure showed that no columnar dendrite was found in any specimen. The grain size and secondary dendrite arm spacing decreased at larger cooling rate, and the relationship between secondary dendrite arm spacing and local solidification time or cooling rate was determined.
Abstract：Solidification process of 231 t 30Cr2Ni4MoV ingot manufactured by slow cooling process was studied using experimental and numerical simulations, which tackled the problems of high cost and long period in large ingot studying. Based on the numerical results of large ingot, five characteristic locations under different temperature gradients and cooling rates chosen from the large ingot were simulated. The experiments were performed under the same temperature conditions as in numerical simulations with specialized instrument. The influences of temperature gradient in the solid–liquid interface and solidification rate on the size and morphology of solidification structure were analyzed at cooling rate ranging from 10-3 to 10-2 C s-1. Solidification macrostructure and microstructure showed that no columnar dendrite was found in any specimen. The grain size and secondary dendrite arm spacing decreased at larger cooling rate, and the relationship between secondary dendrite arm spacing and local solidification time or cooling rate was determined.
DIAO Jing,ZHONG Hong-Gang,LI Ren-Xin, et al. Relationship between secondary dendrite arm spacing and local solidification time of 30Cr2Ni4MoV alloy at slow cooling rates[J]. Journal of Iron and Steel Research International, 2018, 25(8): 821-829.
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2018, Vol. 25 
