Eutectic cell wall morphology and tensile embrittlement in ferritic spheroidal graphite cast iron

Four ferritic spheroidal graphite (SG) cast irons (3.4C-3.9Si, 3.5C-2.7Si, 3.5C-2.0Si, and 2.0C-2.1Si, in wt pct) were chosen to study the eutectic cell morphology and the related tensile embrittlement. For the three test materials with high carbon concentration, the results indicate that the averag...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 1999-07, Vol.30 (7), p.1775-1784
Main Authors: SHIAO, F. T, LUI, T. S, CHEN, L. H, CHEN, S. F
Format: Article
Language:English
Subjects:
Applied sciences
Cast iron
Clustering
Cross-disciplinary physics: materials science
rheology
Elongation
Embrittlement
Eutectics
Exact sciences and technology
Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure
Fatigue, embrittlement, and fracture
Graphite
Heat treating
High temperature
Inclusions
Low temperature
Materials science
Metals. Metallurgy
Morphology
Nodular graphitic structure
Physics
Treatment of materials and its effects on microstructure and properties
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Summary:Four ferritic spheroidal graphite (SG) cast irons (3.4C-3.9Si, 3.5C-2.7Si, 3.5C-2.0Si, and 2.0C-2.1Si, in wt pct) were chosen to study the eutectic cell morphology and the related tensile embrittlement. For the three test materials with high carbon concentration, the results indicate that the average eutectic cell wall size and the amount of cell wall inclusions decrease with decreasing silicon concentration. Compared to the test material with 3.5C-2.0Si, which has many inclusions dispersed in the ferrite matrix, the one with 2.0C-2.1Si shows larger average eutectic cell wall size and larger degree of inclusion clustering in the cell walls. Tensile embrittlement may occur in two temperature ranges, namely, the intermediate low-temperature range at the end of the upper elongation shelf and the intermediate high-temperature range of around 400 °C. In both cases, the brittle cracks are initiated preferentially at the inclusion clusters in the eutectic cell wall region. Hence, the two tensile embrittlements occur only for the materials with a larger degree of inclusion clustering in the eutectic cell walls.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-999-0176-8