Original scientific paper

The assessment of the nodule count and nodularity in ductile iron castings by using thermal analysis

Zoran Glavaš orcid.org/0000-0003-4116-3255 ; Metalurški fakultet Sveučilišta u Zagrebu, Sisak, Hrvatska
Anita Štrkalj orcid.org/0000-0002-7117-4687 ; Metalurški fakultet Sveučilišta u Zagrebu, Sisak, Hrvatska
Franjo Kozina ; Metalurški fakultet Sveučilišta u Zagrebu, Sisak, Hrvatska

Abstract

The effect of parameters which are identified and measured by thermal analysis on the nodule count and nodularity in ductile iron castings was analyzed in this paper. The obtained results show that the nodule count and nodularity increases with increasing the temperature of eutectic undercooling (TEP) and graphite factor 1 (GRF 1) and decreasing recalescence (TR), graphite factor 2 (GRF2) and value of the first derivative of the cooling curve at TS (d/dt TS).
The processing of obtained results was performed by multiple regression analysis. Based on the measured thermal parameters, models for estimation of the nodule count and nodularity were established. The high correlation coefficients between the measured and the estimated values of the nodule count (nodularity) confirm that there is a tight correlation between the thermal parameters of ductile iron melt and microstructural features of ductile iron castings.

Keywords

ductile iron; nodule count; nodularity; thermal analysis

Hrčak ID:

94798

URI

https://hrcak.srce.hr/94798

Publication date:

15.12.2012.

Article data in other languages: croatian

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