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Abstract
Small-angle neutron scattering (SANS) was used to investigate the spheroidization of cementite in pearlite upon annealing. Globally averaged information on the shape and size of cementite particles was collected by using the SANS profile analysis of 0.8 mass pct C pearlitic steel (0.8C) samples annealed at 973 K (700 °C) for 3.6 to 86.4 ks. The change in the total area of the ferrite–cementite interface or aspect ratio determined by ex situ SANS exhibits excellent correspondence with scanning electron microscopy observations. Then, in situ SANS data were collected during isothermal annealing of the 0.8C steel and the commercially available 0.45C carbon steel (JIS-S45C). The shape change of the cementite plate was monitored, and the spheroidization rate of the 0.8C steel was found to be faster than that of the 0.45C steel.
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