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Volume expansion of compacted graphite iron induced by pearlite decomposition and the effect of oxidation at elevated temperature

Sepideh Ghodrat (UGent) , Michael Janssen, Leo Kestens (UGent) and Jilt Sietsma (UGent)
(2013) OXIDATION OF METALS. 80(1-2). p.161-176
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Abstract
Engine cylinder blocks and heads, made of compacted graphite iron, are subjected to prolonged periods of cyclic heating and cooling. These conditions may give rise to the decomposition of the pearlite matrix accompanied by the formation of lower-density graphite and oxides, which will lead to an increase of material volume. The microstructural instability deteriorates the physical and mechanical properties of CGI and accordingly the thermal fatigue properties. In the present work it was shown that the extent and mechanism of volume change are drastically affected by the presence of an oxide atmosphere. It was found that after annealing under atmospheric conditions internal oxidation largely inhibited the progress of pearlite decomposition and therefore much smaller growth rates were obtained as compared to those observed under vacuum conditions in the dilatometer. After 16 h of annealing time at 700 A degrees C in vacuum, the CGI samples exhibited 6 times faster growth kinetics as compared to annealing in open atmosphere.
Keywords
Compacted graphite iron (CGI), Volume expansion, Oxidation, Pearlite decomposition, Dilatometer, CAST IRONS

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Chicago
Ghodrat, Sepideh, Michael Janssen, Leo Kestens, and Jilt Sietsma. 2013. “Volume Expansion of Compacted Graphite Iron Induced by Pearlite Decomposition and the Effect of Oxidation at Elevated Temperature.” Oxidation of Metals 80 (1-2): 161–176.
APA
Ghodrat, S., Janssen, M., Kestens, L., & Sietsma, J. (2013). Volume expansion of compacted graphite iron induced by pearlite decomposition and the effect of oxidation at elevated temperature. OXIDATION OF METALS, 80(1-2), 161–176.
Vancouver
1.
Ghodrat S, Janssen M, Kestens L, Sietsma J. Volume expansion of compacted graphite iron induced by pearlite decomposition and the effect of oxidation at elevated temperature. OXIDATION OF METALS. 2013;80(1-2):161–76.
MLA
Ghodrat, Sepideh, Michael Janssen, Leo Kestens, et al. “Volume Expansion of Compacted Graphite Iron Induced by Pearlite Decomposition and the Effect of Oxidation at Elevated Temperature.” OXIDATION OF METALS 80.1-2 (2013): 161–176. Print.
@article{5640335,
  abstract     = {Engine cylinder blocks and heads, made of compacted graphite iron, are subjected to prolonged periods of cyclic heating and cooling. These conditions may give rise to the decomposition of the pearlite matrix accompanied by the formation of lower-density graphite and oxides, which will lead to an increase of material volume. The microstructural instability deteriorates the physical and mechanical properties of CGI and accordingly the thermal fatigue properties. In the present work it was shown that the extent and mechanism of volume change are drastically affected by the presence of an oxide atmosphere. It was found that after annealing under atmospheric conditions internal oxidation largely inhibited the progress of pearlite decomposition and therefore much smaller growth rates were obtained as compared to those observed under vacuum conditions in the dilatometer. After 16 h of annealing time at 700 A degrees C in vacuum, the CGI samples exhibited 6 times faster growth kinetics as compared to annealing in open atmosphere.},
  author       = {Ghodrat, Sepideh and Janssen, Michael and Kestens, Leo and Sietsma, Jilt},
  issn         = {0030-770X},
  journal      = {OXIDATION OF METALS},
  keyword      = {Compacted graphite iron (CGI),Volume expansion,Oxidation,Pearlite decomposition,Dilatometer,CAST IRONS},
  language     = {eng},
  number       = {1-2},
  pages        = {161--176},
  title        = {Volume expansion of compacted graphite iron induced by pearlite decomposition and the effect of oxidation at elevated temperature},
  url          = {http://dx.doi.org/10.1007/s11085-013-9406-y},
  volume       = {80},
  year         = {2013},
}

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