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Effect of stirring speed on microstructure of A356 alloy cast through rheometal process

  • Robin Gupta , Ashok Sharma , Upender Pandel and Lorenz Ratke
Published/Copyright: July 31, 2017
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 108 Issue 8

Abstract

Synthesis of an A356 alloy slurry with 30 wt.% solid fraction was carried out by the rheometal process, previously known as a rapid slurry formation process. A detailed study of the A356 alloy at different slurry stirring speeds (400, 600, 800, 1 000, and 1 200 rpm) was performed. Variation of the surface morphology of the enthalpy exchange material at different stirring times (0, 5, 10, 15, 20 and 25 s) was also investigated. The evolution of the cast microstructure was observed using optical and scanning electron microscopy. The microstructure exhibited a network of eutectic Si around the primary α-Al phase. The average grain size of the primary α-Al phase decreases with stirring speeds up to 1 000 rpm. For 1 200 rpm, average grain size decreased, however, high turbulence led to entrapment of gas porosity. The experimental results revealed that as stirring times increased under isothermal conditions, the α-Al phase changed its morphology from dendritic to rosette to globular. The effect of flow pattern was investigated with the introduction of four baffles along the crucible wall. These baffles modified the fluid flow pattern such that the average grain size of α-Al phase was further refined.

Keywords: Rheometal process; Enthalpy exchange material; Stirring speed; Baffle; Microstructure
*Correspondence address, Robin Gupta, Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology Jaipur, JLN Marg, Malviya Nagar, Jaipur-302017 (Rajasthan), India, Tel.: +919982592546, E-mail:

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Received: 2016-11-24
Accepted: 2017-04-24
Published Online: 2017-07-31
Published in Print: 2017-08-11

© 2017, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111521
Keywords for this article
Rheometal process; Enthalpy exchange material; Stirring speed; Baffle; Microstructure

Articles in the same Issue

  1. Contents
  2. Contents
  3. Review
  4. Current developments of biomedical porous Ti–Mo alloys
  5. Original Contributions
  6. Investigation of crystallization kinetics and deformation behavior in supercooled liquid region of CuZr-based bulk metallic glass
  7. Modeling of hardening and fracture behavior in Gr.65 steel after intercritical heat treatments
  8. Time evolution of agglomerate size of semisolid magnesium alloy AZ91D during a real isothermal shearing
  9. Effect of stirring speed on microstructure of A356 alloy cast through rheometal process
  10. Phase equilibria of the Mo–Al–Ho ternary system
  11. Experimental investigation of phase equilibria in the Zr–Cu–Ni ternary system
  12. Hot corrosion of the ceramic composite coating Ni3Al–Al2O3–Al2O3/MgO plasma sprayed on 316L stainless steel
  13. Tribological properties of B4C–TiB2–TiC–Ni cermet coating produced by HVOF
  14. Electrochemically fabricated Fe–Ni alloy nanowires and their structural characterization
  15. Short Communications
  16. Synthesis and growth mechanisms of ZrC whiskers fabricated by a VLS process
  17. DGM News
  18. DGM News
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