Effect of copper insert on the microstructure of gray iron produced via lost foam casting

Abstract The effect of insert diameter and pouring temperature on the microstructure of gray iron are studied by inserting the copper wires with diameters of 0.4, 1, and 2 mm into polystyrene patterns, followed by pouring the gray iron melt at two temperatures of 1230 and 1370 °C. The graphite morphology in the reference sample (without copper insert) was type A flake graphite which changed to type B, D or E in the specimens containing copper insert. The aforementioned variations can be attributed to the degree of undercooling developed during solidification. Copper dissolved up to 0.9 wt.% in the matrix and copper particles exceeding the limits of solubility dispersed throughout the matrix or segregated at the bottom of the melt. The process utilized in the present research, can be regarded as a promising approach for in-mold alloying, production of bi-metals, and study the interfacial reactions between a given melt and a supposed solid insert.

[1]  Sushil H. Bhavnani,et al.  Simulation of EPS foam decomposition in the lost foam casting process , 2007 .

[2]  R. Elliott.  Cast iron technology , 1988 .

[3]  R. Monroe.  Expendable pattern casting , 1992 .

[4]  M. A. Neri,et al.  Effect of copper content on the microstructure and mechanical properties of a modified nodular iron , 2003 .

[5]  V. Goncharov,et al.  On the mechanisms of copper effect on structure formation in cast iron , 2007 .

[6]  H. Baker,et al.  Alloy phase diagrams , 1992 .

[7]  W. Kurz,et al.  Fundamentals of Solidification , 1990 .

[8]  Mohamed Abdelrahman,et al.  Monitoring metal-fill in a lost foam casting process. , 2006, ISA transactions.

[9]  R. Ghomashchi,et al.  Reactive interaction of molten aluminum and solid nickel , 2001 .

[10]  N. Nakatani,et al.  Lining of hydraulic cylinder made of cast iron with copper alloy , 2006 .

[11]  S.M.H. Mirbagheri,et al.  Modelling of foam degradation in lost foam casting process , 2004 .

[12]  P. W. Shelton,et al.  The effect of copper additions to the mechanical properties of austempered ductile iron (ADI) , 2006 .

[13]  Y. Shy,et al.  Effect of austempering heat treatment on fracture toughness of copper alloyed gray iron , 2000 .

[14]  N. Parvin,et al.  Pressure measurement and some observation in lost foam casting , 2008 .

[15]  J. Bouix,et al.  Interface chemistry in aluminium alloy castings reinforced with iron base inserts , 2002 .

[16]  Joseph R. Davis,et al.  Properties and selection : irons, steels, and high-performance alloys , 1995 .

[17]  J. Lacaze,et al.  The role of manganese and copper in the eutectoid transformation of spheroidal graphite cast iron , 1997 .

[18]  D. Visco,et al.  A review of physical and kinetic models of thermal degradation of expanded polystyrene foam and their application to the lost foam casting process , 2007 .

[19]  J. G. Pearce,et al.  Copper in cast iron , 1964 .

[20]  A. Tarasov,et al.  Effect of Copper on Structure Formation in Cast Iron , 2003 .

[21]  W. Smith,et al.  Structure and properties of engineering alloys , 1981 .