Projects / Programmes
Study of the eutectoid transformation in the as-cast spheroidal graphite cast iron
| Code |
Science |
Field |
Subfield |
| 2.10.00 |
Engineering sciences and technologies |
Manufacturing technologies and systems |
|
| Code |
Science |
Field |
| T450 |
Technological sciences |
Metal technology, metallurgy, metal products |
eutectoid transformation, spheroidal graphite cast iron, development of "in situ" analysis, equations for mediate determination of microstructure constituents
Researchers (4)
| no. |
Code |
Name and surname |
Research area |
Role |
Period |
No. of publicationsNo. of publications |
| 1. |
02780 |
PhD Alojz Križman |
Materials science and technology |
Researcher |
2004 - 2006 |
773 |
| 2. |
19623 |
PhD Goran Kugler |
Materials science and technology |
Researcher |
2005 - 2006 |
288 |
| 3. |
18565 |
PhD Primož Mrvar |
Materials science and technology |
Researcher |
2004 - 2005 |
816 |
| 4. |
12295 |
PhD Franc Zupanič |
Materials science and technology |
Head |
2006 |
483 |
Organisations (2)
Abstract
The spheroidal graphite cast iron (SGI) is composed by the graphite nodules surrounded by the metal matrix. At the high temperatures (after the completed solidification) the austenite phase is the basic constituents of the microstructure. At the cooling or at the heat treatment the austenite phase decomposes into the graphite eutectoid or perlite, i.e. ferrite and cementite respectively.
Since the mechanical properties of the ferrite-perlite SGI depends upon the fraction of the microstructure constituents, i.e. upon the ratio between the perlite and ferrite phase and less upon the shape, size and the graphite distribution, the acquaintance of the eutectoid transformation is very important.
In the technological and scientific practice the frequent question of the kinetics of eutectoid transformation at the casting making is discussed. Up to this time the investigations have been done to represent the transformations in the heat treated state, and not in the cast state due to the limited use of the "in situ" research methods. Hence it follows the need for the detailed study of the transformations linking to the "in situ" measurements. It performs the authentic base for the due intervention into the planned development of the microstructure and thus into the achievement of the corresponding properties.
The purpose of the project is the detailed study and making the kinetic model of the SGI eutectoid transformation in the as-cast state. Therefore the necessary and reliable realization of the up-to date computer supported dilatometric equipment with the specific measuring cell for measurement of the temperature and dimensional changes during the solidification and transformation in the solid state is needed. The construction of such equipment enables the measurements in the technological practice. The process of the eutectic transformation is planned to be controlled by the evaluation of the curves obtained by "in situ" dilatometric analysis, DTA, dilatometric analysis in the solid state and chemical analysis. It is planned that the decomposition of austenite and the fraction of the microstructure constituents (ratio between the ferrite and perlite phases) should be defined quantitatively by the corresponding physical models considering the kinetics of the eutectoid transformation. Thus the influence of the cooling velocity, the number of the graphite nodules and also the chemical composition of the cast should be considered.
