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- W2264728290 abstract "The objective of this task was to determine whether ductile iron and compacted graphite iron exhibit age strengthening to a statistically significant extent. Further, this effort identified the mechanism by which gray iron age strengthens and the mechanism by which age-strengthening improves the machinability of gray cast iron. These results were then used to determine whether age strengthening improves the machinability of ductile iron and compacted graphite iron alloys in order to develop a predictive model of alloy factor effects on age strengthening. The results of this work will lead to reduced section sizes, and corresponding weight and energy savings. Improved machinability will reduce scrap and enhance casting marketability. Technical Conclusions: AÂA¢AÂAÂAÂA¢ Age strengthening was demonstrated to occur in gray iron ductile iron and compacted graphite iron. AÂA¢AÂAÂAÂA¢ Machinability was demonstrated to be improved by age strengthening when free ferrite was present in the microstructure, but not in a fully pearlitic microstructure. AÂA¢AÂAÂAÂA¢ Age strengthening only occurs when there is residual nitrogen in solid solution in the Ferrite, whether the ferrite is free ferrite or the ferrite lamellae within pearlite. AÂA¢AÂAÂAÂA¢ Age strengthening can be accelerated by Mn at about 0.5% in excess of the Mn/S balance Estimated energy savings over ten years is 13.05 trillion BTU, based primarily more » on yield improvement and size reduction of castings for equivalent service. Also it is estimated that the heavy truck end use of lighter castings for equivalent service requirement will result in a diesel fuel energy savings of 131 trillion BTU over ten years. « less" @default.
- W2264728290 created "2016-06-24" @default.
- W2264728290 creator A5044624359 @default.
- W2264728290 date "2012-09-19" @default.
- W2264728290 modified "2023-09-25" @default.
- W2264728290 title "Energy Saving Melting and Revert Reduction Technology: Aging of Graphitic Cast Irons and Machinability" @default.
- W2264728290 doi "https://doi.org/10.2172/1054341" @default.
- W2264728290 hasPublicationYear "2012" @default.
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