Influence of Semi-Solid Isothermal Heat Treatment on Microstructure of Gray Cast Iron
- 1 Department of Physics College of Science, University of Hail, Hail, Saudi Arabia
Abstract
Materials serve as an enabling technology contributing to solutions in problems of concern to society. In this research, the effect of semi-solid isothermal heat treatment on graphite morphologies and matrix structure for gray cast iron were studied. Microstructure observations and measurements of flaky graphite morphology are reported as a function of isothermal heating time range of 5 to 25 minutes after isothermal heating temperature at 1163℃. The effect heating time, on the semisolid microstructures during partial re-melting was investigated. Flack graphite morphology was changed significantly by isothermal heating of gray cast iron at 1163℃ for heating time above 15 min resulting fine graphite morphology in matrix structure. Hardness increases with increasing heating time due to the amount of cementite and fine pearlite matrix for air cooled gray cast iron. The optimum heating treatment condition was achieved at the temperature of 1163℃ for the range of 15 to 20 min.
- T. J. Chen, Y. Ma, Y. Hao, S. Lu, G. J. Xu and J. Sun, “Structural Evolution of ZA27 Alloy during Semi-Solid Isothermal Heat Treatment,” Transactions of Nonferrous Metals Society of China, Vol. 11, 2001, pp. 98-102.
- J. M. Kim, K. T. Kim and W. J. Jung, “Effects of Isothermal Heating Procedure and Strontium Addition on Semisolid Forming of AZ91 Magnesium Alloy,” Journal of Materials Science & Technology, Vol. 18, 2002, pp. 698-701.
- R. Elliott, “Cast Iron Technology,” Butterworth-Heinemann Ltd., London, Boston, 1988.
- C. E. Bates, “Effects of Alloy Elements on the Strength and Microstructure of Gray Cast Iron,” Transactions of the American Foundrymen’s Society, Vol. 92, 1984, pp. 923-946.
- B. Leube and L. Arnberg, “Moddeling Gray Iron Solidification Microstructure for Prediction of Mechanical Properties,” International Journal of Cast Metals Research, Vol. 11, 1999, pp. 507-514.
- M. Ramadan, M. Takita and H. Nomura, “Effect of Semi-Solid Processing on Solidification Microstructure and Mechanical Properties of Gray Cast Iron,” Materials Science and Engineering A, Vol. 417, 2006, pp. 166-173.
- A. Muumbo, M. Takita and H. Nomura, “Processing of Semi-Solid Gray Cast Iron Using the Cooling Plate Technique,” Materials Transactions, Vol. 44, No. 5, 2003, pp. 893-900.
- B. Abbasi-Khazaei and S.Ghaderi, “A Novel Process in Semi-Solid Metal Casting,” Journal of Materials Science & Technology, Vol. 28, No. 10, 2012, pp. 946-950.
- T. Sjogren, P. Vomacka and I. L. Svensson, “Comparison of Mechanical Properties in Flake Graphite and Compacted Graphite Cast Irons for Piston Rings,” International Journal of Cast Metals Research, Vol. 17, No. 2, 2004, pp. 65-71.