The Effect of Cu on the Microstructure and the Elevated Temperature Properties of Ferritic Heat Resistant Cast Iron

Abstract:

The effects of copper addition on the microstructure and the elevated temperature properties of ferritic heat resistant cast iron were investigated. The as-cast pearlite formed due to the addition of Cu was fully eliminated by full annealing. As the content of Cu increased, the grain size of ferrite decreased. The grain refinement due to the addition of Cu enhanced the mechanical properties at room temperature, however, those at elevated temperature deteriorated. The addition of Cu diminished the volume change during α→γ transformation. The starting point of α→γ transformation increased with Cu contents under 1.15wt% Cu but this tendency was reversed above this point. This trend can be found also in the case of lattice parameter of ferrite matrix. It is inferred from Fe-Cu phase diagram that the addition of Cu enlarged the coexistence zone of α and γ, so it diminished the volume change during α→γ transformation.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 1448-1451
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.1448
• Online since: June 2010
• Authors: Kyeong Hwan Choe, Sang Mok Lee, Myung Ho Kim, Kyong Whoan Lee
• Keywords: Cu Addition, Elevated Temperature Property, Ferritic Heat Resistant Cast Iron

References

[1] J. D. Mullins: Ductile Iron Data for Design Engineers, Rio Tinto Iron & Titanium Inc., (1990).

[2] K. H. Choe et al.: J. Kor. Foundrymen's Soc. Vol. 29 No. 5 (2009), pp.257-264.

[3] R.C. Gifkins: Mater. Charact. Vol. 32 (1994) (2), pp.59-77.