Effect of cooling rate on the formation of acicular ferrite in Ti deoxidized steel

The microstructures obtained at different cooling rates were studied in the Ti deoxidized steel and the chemical composition was also analyzed by energy dispersive X-ray spectroscopy.The result shows that at the cooling rate of 8 ℃/s to 15 ℃/s,the acicular ferrites are formed within a temperature range of 500 ℃ to 800 ℃.The Ti-Al inclusions can induce nucleation of acicular ferrite and sympathetic nucleation as well,which make the acicular ferrite in steel interlocked and grains refined apparently.