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- Selin, Martin, 1979-, et al.
(författare)
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Comparison of material properties in as-cast and austempered cast irons with three different graphite morphologies
- 2008
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Ingår i: Giessereiforschung (International Foundry Research). - 0046-5933. ; 60:3, s. 20-25
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Tidskriftsartikel (refereegranskat)abstract
- Three cast irons with different graphite morphologies were austempered in order to investigate how some important material properties are affected. The cast irons had similar chemical compositions so valid comparisons could be made between morphologies and between as-cast and austempered samples. The cast irons were austenitized for 2h at 900°C and austempered at 350°C for five different times, resulting in coarse ferrite needles. Microstructure, hardness, scuffing resistance, ultimate tensile strength (UTS) in bending and thermal properties was investigated for both as-cast and austempered samples. The hardness increased by about 25% after 110 min austempering while the thermal conductivity dropped about 30%, for all three morphologies. Scuffing resistance increased significantly when austempering lamellar graphite cast iron but was slightly reduced for both the compacted and nodular graphite morphologies. After 110 min austempering, the ultimate tensile strength was reduced for the lamellar and compacted samples, but was slightly increased for the nodular morphology.
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- Selin, Martin, 1979-, et al.
(författare)
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Effect of Alloying Elements on Graphite Morphology in CGI
- 2010
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Ingår i: Materials Science Forum. - Zurich : Trans Tech Publications. - 0255-5476 .- 1662-9752. ; 649, s. 171-176
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Tidskriftsartikel (refereegranskat)abstract
- Understanding how alloying elements and amounts affect the shape and size of graphite in compacted graphite cast irons could be of great importance. Some important material properties that are affected by the graphite shape are tensile strength and thermal conductivity. Knowing the effect of alloying additions could be of assistance when trying to optimise material for a specific application. In order to determine how graphite changes depending on alloying additions the microstructure of nineteen CGI materials were investigated. All melts were based on one chemical composition and alloying elements were added to obtain melts with variation in magnesium, silicon, copper, tin, chromium and molybdenum. Some of the more important microstructure features that were analysed are the amount and size of different graphite particles. The result from this analysis should give an indication on what features each alloying element affect and how these features varies with alloying amount.
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