Microstructural evolution during reheating of A356 machining chips at semisolid state

Fang Wang; Wen-qiang Zhang; Wen-long Xiao; Hiroshi Yamagata; Chao-li Ma

doi:10.1007/s12613-017-1475-5

Volume 24 Issue 8

Aug. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(8): 891-900

Fang Wang, Wen-qiang Zhang, Wen-long Xiao, Hiroshi Yamagata, and Chao-li Ma, Microstructural evolution during reheating of A356 machining chips at semisolid state, Int. J. Miner. Metall. Mater., 24(2017), No. 8, pp. 891-900. https://doi.org/10.1007/s12613-017-1475-5

Cite this article as:

Fang Wang, Wen-qiang Zhang, Wen-long Xiao, Hiroshi Yamagata, and Chao-li Ma, Microstructural evolution during reheating of A356 machining chips at semisolid state, Int. J. Miner. Metall. Mater., 24(2017), No. 8, pp. 891-900. https://doi.org/10.1007/s12613-017-1475-5

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Research Article

Microstructural evolution during reheating of A356 machining chips at semisolid state

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Corresponding author:
Wen-long Xiao E-mail: wlxiao@buaa.edu.cn
Received: 12 October 2016; Revised: 10 April 2017; Accepted: 12 April 2017

Abstract

Abstract

The microstructural evolution of A356 machining chips in the semisolid state was studied at different temperatures and holding times. The results showed that the elongated α-Al grains first recrystallized in the semisolid state and then became globular with a high shape factor (SF). Both the temperature and the holding time clearly affected the grain size and SF. When the heating temperature or holding time was increased, the grain size and SF gradually increased and finally became stable. Moreover, the Vickers hardness of primary α-Al grains gradually decreased with increasing heating temperature. The optimal slurry for semisolid processing, with a good combination of grain size and SF, was obtained when the chips were held at 600℃ for 15 min. The semisolid slurry of A356 chips exhibited a lower coarsening rate of α-Al grains than those produced by most of the conventional semisolid processes. The coarsening coefficient was determined to be 436 μm³·s^-1 on the basis of the linear Lifshitz-Slyozov-Wagner (LSW) relationship.
- semisolid slurry;
- aluminum chips;
- microstructural evolution;
- grain coarsening;
- microhardness

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