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The effect of dendrite arm spacing on hot tearing susceptibility during directional solidification was explored by casting bi-crystal samples with the same grain boundary misorientation but different dendrite arm spacing. It was found that smaller dendrite arm spacing does reduce the hot tearing tendency. The eutectic melt is more finely dispersed and increasingly discontinuous as the dendrite arm...
The effect of grain boundary (GB) fraction on hot tearing during directional solidification was explored. The increase of GB fraction was found to reduce the hot tearing tendency. The eutectic melt is finely dispersed and increasingly discontinuous at the GBs when the GB fraction is increased. The change of eutectic melt at the GBs is related to the reduced concentration of GB elements or impurities...
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