Study of the radial direction temperature change law of the coil and control strategy in ultra-fast coolingZhen-lei Li, Guo Yuan, Yi Han, Xiao Jiang, Xue-qiang Wang, Wu-guang Qu and Guo-dong WangMetall. Res. Technol., 112 1 (2015) 106DOI: https://doi.org/10.1051/metal/2015002