Spheroidal graphite cast iron property enhancement by heat treatment
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Thankachan T. Pullan
Abstract
Ductile iron, popularly known as spherodized graphite iron (SGI), is a special variety of cast iron having carbon content more than 3 wt.% and has graphite present in compact, spherical shapes. These compact spheroids hamper the continuity of the matrix much less than graphite flakes, which results in higher strength and toughness with a structure that resembles gray cast iron, thus imparting superior mechanical properties. The high ratio of performance to cost which they offer to the designer and end user makes them used extensively for industrial applications. The basic chemical elements such as carbon, silicon, manganese, magnesium, copper etc. play an important role in the SGI casting process. The behavior of these elements in molten metal of the ductile iron varies because of their different mechanical and chemical properties. However, to extend the consistency and range of properties of SGI castings beyond its properties in the as-cast condition, heat treatment is a necessary operation. In this research specimens are prepared with different combinations of alloying elements. On these specimens studies are performed with various tests to understand the effect of heat treatment operations such as tempering and austempering to transform the brittle behavior to ductile behavior.
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- Original Contributions
- Assessment of the contact behavior of a soft hemispherical finger tip in curved profile grasping
- Dynamic crushing behavior of functionally graded honeycomb structures with random defects
- Development of a mathematical model and its application to the stress evolution of a multi-crystalline silicon billet during continuous casting
- Improved polycrystalline Ni54Mn16Fe9Ga21 high-temperature shape memory alloy by γ phase distributing along grain boundaries
- Spheroidal graphite cast iron property enhancement by heat treatment
- On the abrasion of heat-treated 2.8C21Cr1Mo white cast iron
- Electrochemical hydrogen storage behaviour of as-cast and as-spun RE–Mg–Ni–Mn-based alloys applied to Ni–MH battery
- Dry sliding friction and wear behavior of bronze matrix composites reinforced with Ni3Al particles: Comparison with conventional brake lining
- Microstructure optimization and mechanical properties of lightweight Al–Mg2Si in-situ composite
- Densification and mechanical properties of ZrO2–CaAl4O7 composites obtained by reaction sintering
- Active soldering of aluminum–graphite composite to aluminum using Sn3.5Ag4Ti0.5Cu active filler
- Short Communications
- Effect of hot differential speed rolling on microstructure and mechanical properties of Fe3Al-based intermetallic alloy
- DGM News
- DGM News