On the curve (a), there was a recalescence
corresponding to the growth of primary [gamma]-Fe dendrites (at about 1543 K) and then led to thermal arrest, which determined the liquidus temperature, [T.sub.L] [approximately equal to] 1578 K.
Using an IR camera, we observed that the solidification initiation of the main drop, which corresponds to the supercooling stage duration, is triggered by the erratic wave-like recalescence
front of the surrounding condensed microdrops.
* All lanthanum additions led to the development of significant recalescence
prior to eutectic growth; no recalescence
was observed in the alloy at high levels of cerium additions.
There were 8 input parameters: liquidus temperature, [T.sub.liq], lowest eutectic temperature, [T.sub.e,low], the recalescence
, R, solidus temperature, Ts, graphite factor 1, GF1, graphite factor 2, GF2, cooling rate at solidus, d[T.sub.s]/dt, and eutectoid temperature, [T.sub.eid].
is observed, the furnace temperature is set to within 1 K below the freezing-point temperature.
First, the recalescence
phenomenon, where the temperature rises due to the latent heat release, is well illustrated and a substantial temperature plateau develops immediately after the recalescence
The second recalescence
([T.sub.n]-[T.sub.r] in Figure 2) indicated that the monotectic reaction occurred in the melt (L1 [right arrow] a(Cu) + L2).
Thermal analysis data were recorded to determine under-cooling and recalescence
. Changes in the microstructure, chilling tendency and mechanical properties of the ductile iron were investigated, and the data were evaluated.
The crudest interpretation of the phenomena taking place can be obtained by direct observation of the temperature-time curve, as most reactions are exothermic and result in the reduction in the cooling rate or, in some cases, can result in the increase in temperature due to recalescence
They reported higher primary graphite arrest in irons treated with sulfur while the eutectic and recalescence
parameters remained unchanged.
The results show that a small addition of boron shifts up the cooling curve causing the recalescence
to disappear entirely.
The system, which is based on advanced thermal analysis, not only calculates metallurgical attributes such as liquidus, eutectic, recalescence
, cooling rate, active carbon equivalent and 20 more but also interprets the data.