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Chess Project

This project update covers the progress made in metal casting, wax density measurement, and phase diagram analysis. Topics include the casting of metal pawns, issues with investment, wax density measurement, poor investment decision, pawn polishing, phase diagram analysis, and upcoming schedule.

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Chess Project

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  1. Chess Project Project update presentation 3-20-08

  2. Last Week • Cast first metal pawns • Explored surface smoothing options • Poured investment – failure • Prepared metallographic samples • Strategized regarding future goals

  3. Wax Density Measurement • Density measured using water displacement method • Cast wax: d = 0.78 g/mL • Relevant when considering detatchment/floating of wax during investment stage

  4. Poor Investment Decision • Ceramic did not properly hardened, remained soft and wet for several days • Likely a problem with the amount of catalyst added (1.2% of powder weight, diluted in water by 3% weight) • Salvaged wax pieces, will reinvest over spring break

  5. Pawn Polishing As-cast (left), sand-blasted (middle), and machine-polished (right) pawns are shown above. Note the difference in coloration.

  6. Phase Diagram • Composition of received material at ~40% zinc • Some zinc is lost during casting (moves our composition left on the diagram)

  7. As-Received Material • Both beta and alpha phases present in considerable amounts • Few voids in the material • 100x magnification

  8. Cast Material • Far less alpha phase present in our sample • Many voids visible • 100x magnification

  9. Phase Diagram

  10. New Cast Sample • Sample from thicket segment of material taken • More alpha expected to be found in the microstructure • Result of thicket cross section and slower cooling rate

  11. Upcoming Schedule • Continue metallographic studies • Prepare more wax trees • Pour investment, prepare for a “casting week” to get the bulk of our castings completed • Begin surface treatments of already cast pawns

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