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| Effect of heating rate on microstructure of semi-solid 2024 alloy during partial remelting |
| WANG Shun-Cheng;Yuan-Yuan LI;Wei-Ping CHEN;Guo-Ru PAN |
| 华南理工大学 |
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Cite this article:
WANG Shun-Cheng; Yuan-Yuan LI; Wei-Ping CHEN; Guo-Ru PAN. Effect of heating rate on microstructure of semi-solid 2024 alloy during partial remelting. Acta Metall Sin, 2008, 44(8): 905-910 .
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Abstract The semi-solid 2024 alloy billets prepared by low superheat pouring were reheated to 625℃ with 7, 15.7 and 31.3℃/min, respectively, and then held isothermally. The effect of heating rate on the microstructure of billets was studied by optical microscope and metallographic image analysis system. The results show that with the prolongation of heating time, the liquid fraction increases gradually, the grains grow up quickly by the coalescence and then spheroidize gradually by the Ostwald ripening. The higher the heating rate is, the quicker the formation rate of liquid phase is and the finer and rounder the grains are. It is found through the analysis of microstructure evolution mechanism that accelerating the formation rate of liquid phase by increasing the heating rate can restrain the coalescence of grains to a certain extent, in which the growth rate of grains is decreased and the spheroidization rate is accelerated.
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Received: 22 October 2007
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