We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Mechanical Properties and Fracture Toughness Prediction of Ductile Cast Iron under Thermomechanical Treatment.
- Authors
Abdellah, Mohammed Y.; Alharthi, Hamzah; Alfattani, Rami; Suker, Dhia K.; Abu El-Ainin, H. M.; Mohamed, Ahmed F.; Hassan, Mohamed K.; Backar, Ahmed H.
- Abstract
Temperature has a great influence on the mechanical properties of ductile cast iron or nodular cast iron. A thermomechanical treatment was carried out at various elevated temperatures of 450 °C, 750 °C and 850 °C using a universal testing machine with a tub furnace. Specimens were held at these temperatures for 20 min to ensure a homogeneous temperature distribution along the entire length of the specimen, before a tensile load was applied. Specimens were deformed to various levels of uniform strain (0%, 25%, 50%, 75%, and 100%). These degrees of deformation were measured with a dial gauge attached to a movable cross plate. Three strain rates were used for each specimen and temperature: 1.8 × 10 − 4 s − 1 , 9 × 10 − 4 s − 1 and 4.5 × 10 − 3 s − 1 . A simple analytical model was extracted based on the CT tensile test geometry and yield stress and a 0.2% offset strain to measure the fracture toughness (JIC). To validate the analytical model, an extended finite element method (XFEM) was implemented for specimens tested at different temperatures, with a strain rate of 1.8 × 10 − 4 s − 1 . The model was then extended to include the tested specimens at other strain rates. The results show that increasing strain rates and temperature, especially at 850 °C, increased the ductility of the cast iron and thus its formability. The largest percentage strains were 1 and 1.5 at a temperature of 750 °C and a strain rate of 1.8 × 10 − 4 s − 1 and 9 × 10 − 4 s − 1 , respectively, and reached their maximum value of 1.7 and 2.2% at 850 °C and a strain rate of 9 × 10 − 4 s − 1 and 4.5 × 10 − 3 s − 1 , respectively. In addition, the simple and fast analytical model is useful in selecting materials for determining the fracture toughness (JIC) at various elevated temperatures and different strain rates.
- Subjects
NODULAR iron; THERMOMECHANICAL treatment; STRAIN rate; FRACTURE mechanics; CAST-iron; FRACTURE toughness
- Publication
Metals (2075-4701), 2024, Vol 14, Issue 3, p352
- ISSN
2075-4701
- Publication type
Article
- DOI
10.3390/met14030352