Abstract
Studying the thermo-mechanical behavior of ductile iron is necessary to develop the rolling process for ductile iron sheet/strip production, thus, extending its application by replacing steel in several fields such as machine casing, constructional applications, etc. In order to predict the safe rolling conditions for producing sheets and strips, the thermo-mechanical behavior of a ductile iron alloy, with CE of 4.48, is studied by physical simulation of hot rolling process using Gleeble-3500 simulator. The test was conducted on specimens at a range of deformation temperatures from 800°C to 950°C while three different strain rates; namely 0.05, 0.1 and 0.5 s-1 were used. The results obtained, show minimum values of flow stresses at 850°C. By increasing the deformation temperature up to 900°C, the flow stresses increased to reach maximum values, beyond which the flow stress decreased again. A remarkable dynamic recrystallization is observed at the deformation temperatures of 850°C and 800°C with applied strain rates of 0.05 and 0.1 s-1. Gleeble test results are correlated with microstructure observations on samples quenched at their deformation temperatures, where the changes in structure and graphite morphology are reported. The deformation process at high temperatures namely 950°C and 900°C result in changing the graphite shape from a spheroidal-like to a saucer-like shape. However, by decreasing the deformation temperature to 850°C as well as 800°C, graphite with lamellar shape is observed. As a conclusion, ductile iron could be successfully deformed without cracking at the applied conditions.
Highlights
Ductile iron (DI) is an iron-carbon alloy consisting of graphite nodules embedded in a steel matrix [1]
Flow Stresses during the Thermo-Mechanical Processing The effect of the deformation temperatures on the mechanical behavior of the ductile iron alloy with applied strain rates of 0.05, 0.1 and 0.5 s−1 is shown in Figures 6(a)-(c) respectively
It is clearly observed that the thermo-mechanical behavior of the ductile iron alloy is nearly the same as the deformation temperatures 850 ̊C and 800 ̊C
Summary
Ductile iron (DI) is an iron-carbon alloy consisting of graphite nodules embedded in a steel matrix [1]. Ductile iron compelled a wide recognition as an economical choice for replacing steel parts for its high toughness [5]. Ductile iron has advantages due to the additional characteristics that can be customized for applications requiring corrosion resistance, low thermal expansions, vibration damping and lubricating surface [7] [8]. These properties are required in strips and sheets for several applications namely; machine casing and constructional applications. Ductile iron exhibits high ductility for the forming process, only a few researchers [9] [10] [11] [12] investigated the formability and the rolling behavior of ductile iron
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