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Research on Modification of Steel Fiber in Investment Casting shell

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Abstract

In this study, different amounts of steel fiber were added in the slurry to prepare fiber reinforced shell with improved performances of investment casting shell. The thixotropy of slurry, as well as green strength, fired strength, high-temperature strength, thermal diffusivity and permeability of the shells were all examined. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to identify morphologies and compositions of the shells. The results showed that the viscosity of the slurry increased with the increase of steel fiber content. The addition of 0.4% steel fiber (3 mm in length) resulted in maximum thixotropic loop of the slurry, and the addition of 0.4% steel fiber (4 mm in length) resulted in maximum green strength of 2.45 MPa, fired strength of 5.82 MPa, and strong enough high-temperature strength. XRD data revealed a shell was mainly composed of Zr(SiO4) and mullite. Also, high temperature led to shell mullitization and sintering. SEM observations indicated that reinforcement steel fiber in the shell was mainly achieved by debonding, deforming, and breaking processes. The addition of fiber led to significantly improved heat dissipation ability and permeability of the shell.

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Acknowledgements

This project is supported by National Natural Science Foundation of China (Grant No. 51865042); National Natural Science Foundation of Inner Mongolia (Grant No. 2021LHMS05003, 2019LH05026 and 2020MS05024).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot, China

    Kai Lü, Simin Shen, Changqing Ma, Yanfen Li & Kaixin Liu

  2. Engineering Research Center of Development and Processing Protection of Advanced Light Metals, Ministry of Education, Hohhot, China

    Kai Lü

  3. The Inner Mongolia Advanced Materials Engineering Technology Research Center, Hohhot, China

    Kai Lü

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  1. Kai Lü
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  2. Simin Shen
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  3. Changqing Ma
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  4. Yanfen Li
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  5. Kaixin Liu
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Correspondence to Kai Lü.

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Lü, K., Shen, S., Ma, C. et al. Research on Modification of Steel Fiber in Investment Casting shell. Inter Metalcast 16, 1849–1857 (2022). https://doi.org/10.1007/s40962-021-00722-4

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  • DOI: https://doi.org/10.1007/s40962-021-00722-4

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