In special solidification conditions, eutectic niobium carbonitride is formed in mild steel containing niobium (Fig. 1). The presence of a similar carbonitride at grain boundaries in steel castings was reported by Hannaerz, Lindborg and Lehtinen. They suggested that the carbonitride was formed by precipitation from austenite below 1400° C. In the present work the distribution and the size of carbonitride particles showed clearly their eutectic origin.
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References
1.
HannaerzN. E., LindborgU., and LehtinenB., J. Iron Steel Inst., 1968, 206, 68.
2.
GuhaF. and KolarD., J. Less-Common Metals, 1972, 29, 33.
3.
NordbergH. and AronsonB., J. Iron Steel Inst., 1968, 206, 1263.
