THE EFFECT OF SPHEROIDAL GRAPHITE ON FRACTURE PROCESS INITIATION IN CAST IRON

1 NEVŘELA Martin
Co-authors:
1 WEISZ Michal 1 SEHNOUTKA Petr 1 BESEDA Marek
Institution:
1 VSB - Technical University of Ostrava, Faculty of Materials Science and Technology, Ostrava, Czech Republic, EU, martin.nevrela@vsb.cz
Conference:
32nd International Conference on Metallurgy and Materials, Orea Congress Hotel Brno, Czech Republic, EU, May 17 - 19, 2023
Proceedings:
Proceedings 32nd International Conference on Metallurgy and Materials
Pages:
132-137
ISBN:
978-80-88365-12-9
ISSN:
2694-9296
Published:
13th June 2023
Metrics:
218 views / 141 downloads
Abstract

Achieving a balance between strength, toughness and technological properties of cast iron requires knowledge of the relationships between local and macroscopic failure processes. High toughness is conditional upon the substantial dissipation of deformation energy during crack propagation and the initiation of ductile failure. In spheroidal graphite cast iron, toughness depends on the size distribution of these particles, their volume fraction, and the strength of the ferritic matrix/particle phase boundary. The proposed model of fracture surface formation shows how nucleation deformation depends on the local characteristics of the cast iron, graphite particle size, and the strength and energy of the phase boundary. Local fracture deformation during cavity coalescence is most strongly affected by the geometric characteristics of the structure, the spatial distribution of particles, their volume fraction in the matrix, and also the strengthening characteristics of the matrix. The model of fracture surface formation was successfully tested on commercially produced ferritic spheroidal graphite cast iron. The criterion of deformation energy equilibrium was used to predict nucleation deformation and deformation during cavity coalescence. The model can be applied in designing optimized graphite particle size distribution and developing optimized technological parameters for cast iron production.

Keywords: Cast iron, deformation energy, crack propagation, ductile failure, spheroidal graphite

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Scroll to Top