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Metallurgical and Materials Transactions B

, Volume 50, Issue 1, pp 77–85 | Cite as

Effect of Naturally Deposited Film on the Sub-rapid Solidification of Medium Manganese Steel by Using Droplet Solidification Technique

  • Cheng Lu
  • Wanlin WangEmail author
  • Jie Zeng
  • Chenyang Zhu
  • Jiang Chang
Article
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Abstract

In this study, the effect of naturally deposited film on the interfacial heat transfer during the sub-rapid solidification of medium manganese steel was studied by means of a droplet solidification technique. The heat transfer rates were calculated by the Inverse Heat Conduction Program (IHCP), through computing the responding temperatures’ gradient inside the cooling mold. The results showed that the contact angle between the mold and solidified droplet becomes lower (from 117.539 to 82.217 deg) with the repeat of the dropping tests, which means the wettability improves after the deposition of the natural film. Meanwhile the liquid time (the time from the start of ejection to the initiation of solidification) decreases from 1.76 to 1.28 seconds during the tests, suggesting that the steel keeps in the liquid state shorter. Therefore, the initiation of solidification is advanced, such that there would be less time for matching the scale of the shell and the mold. Consequently, the maximum heat flux increases from 2.90 to 6.35 MW/m2 with the deposition of the natural film, as the wettability is getting better leading to the reduction of the interfacial thermal resistance. However, the final maximum heat flux was decreasing to 4.98 MW/m2 due to the increased thickness of the film and corresponding interfacial thermal resistance. Moreover, it was found that the secondary dendrite arm spacing decreased from 10.84 to 5.01 μm at first, and then it increased to 8.11 μm with the variations of heat flux and cooling rate.

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Notes

Acknowledgments

This work is supported by the National Natural Science Foundation of China (51661130154, U1760202) and the Newton Advanced Fellowship (NA150320).

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Cheng Lu
    • 1
    • 2
  • Wanlin Wang
    • 1
    • 2
    Email author
  • Jie Zeng
    • 1
    • 2
  • Chenyang Zhu
    • 1
    • 2
  • Jiang Chang
    • 3
  1. 1.School of Metallurgy and EnvironmentCentral South UniversityChangshaChina
  2. 2.National Center for International Research of Clean MetallurgyCentral South UniversityChangshaChina
  3. 3.Aquion Energy, LLCPittsburghUSA

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