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Sigma phase in the cast alloy based on the Fe3Al intermetallic phase

Podrez-Radziszewska M., Lachowicz M., Haimann K., Jasionowski R.

Archives of Foundry Engineering

2011

Vol. 11, iss. 2

105-108

The paper presents study results for cast alloy based on the Fe3Al intermetallic phase. The study material was Fe-28Al-5Cr-1Mo-0,1Zr- 0,005B% at. alloy in the cast state. The microscopic research, phase analysis with X-ray diffraction, bending test and observation of the alloy surface exposed to corrosion have been performed. It has been found that presence of the sigma phase in the material structure influences high hardness of the tested alloy, its susceptibility to brittle fracture and favours the intercrystalline corrosion.

Cracks in high-manganese cast steel

Chojecki A., Telejko I.

Archives of Foundry Engineering

2009

Vol. 9, iss. 4

17-22

The reasons which account for the formation of in service cracks in castings made from Hadfield steel were discussed. To explain the source of existence of the nuclei of brittle fractures, the properties of cast steel were examined within the range of solidification temperatures, remembering that feeding of this material is specially difficult, causing microporosity in hot spots. This creates conditions promoting the formation of microcracks which tend to propagate during service conditions involving high dynamic stresses, and explains why the cracks are mainly characterized by a brittle nature. The reason for crack formation in service are micro-porosities formed during casting solidification.