A Study on the Relationship between Primary Dendrite Arm Spacing of Low Carbon Steel and Solidification Cooling Rate up to 10³ K/s

抄録

The present study aims to clarify the relationship between primary dendrite arm spacing (PDAS), S₁[μm], and solidification cooling rate, r[K/s], up to high cooling rate region. Low carbon steel was cast in three kinds of apparatuses and PDAS was measured to be found as function of solidification cooling rate as follows:
S₁ = 0.333×r^－0.331 (0.62~800 K/s)
Power factor of r has been discussed in view point of the balance of thermal gradient, G(K/mm), and growth rate of dendrite tip, v(mm/s).