Transition of tensile strength and damaging mechanisms of compacted graphite iron with temperature

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 677; pp. 290 - 301
• Main Authors: Qiu, Y., Pang, J.C., Yang, E.N., Li, S.X., Zhang, Z.F.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 20-11-2016; Elsevier BV
• Subjects: Cast iron; Compacted graphite iron; Cylinder heads; Damage; Damaging mechanism transition; Deformation; Deformation mechanisms; Design optimization; Dislocations; Elongation; Elongation to fracture; Fracture mechanics; Graphite; Mechanical properties; Quantitative relationship; Tensile strength; Thermal properties; Thermodynamic properties; Trends; Elongation to fracture; Quantitative relationship; Damaging mechanism transition; Compacted graphite iron; Tensile strength
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2016.09.035

Compacted graphite iron (CGI) plays an increasingly important role in the cylinder head of diesel industry because of its good thermal and mechanical properties. In this study, tensile strength, elongation to fracture and the corresponding damaging mechanism observed by in-situ technique at different temperatures have been investigated. The experimental results of CGI show that with increasing the temperature, the tensile strength decreases slightly at first and then dramatically, and the elongation to fracture decreases initially, and then increases. The former trend is mainly controlled by the transitional deformation mechanisms from slip band stage (the dislocation movement inhibition) to boundary sliding stage (vacancy diffusion). Based on these, the corresponding quantitative relationships are firstly proposed: double-exponential and exponential relationships, respectively. In addition, the elongation to fracture is initially divided into uniform and softening elongations. Accordingly, the latter trend is controlled by the similar transitional mechanisms. The newly proposed relationships and corresponding mechanisms can provide new clues for the optimizing design of CGI and the understanding of similar phenomenon for other cast irons and even some metallic materials.