Thixocasting Steel Parts
Final rept. 1 Apr 1977-30 Jun 1978
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MATERIALS SCIENCE AND ENGINEERING
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This report describes the Thixocasting process as applied to the die casting of small, AISI 4340 parts. 2,200 shots of semi-solid AISI 4340 were cast in an industrial die casting machine to investigate the feasibility of the Thixocast process for this low alloy steel. The Thixocastings produced demonstrate good quality with radiographic examination showing low porosity levels. The rheological behavior of Rheocast AISI 4340 is qualitatively similar to that of other alloys previously studied. Thus, the viscosity of a Rheocast AISI 4340 slurry increases with increasing fraction solid, and at a given fraction solid, it increases with increasing solidification rate and decreasing shear rate.
- Metallurgy and Metallography
- Fabrication Metallurgy