Effects of Room Temperature Aging on Ductile Iron
Aging characteristics of three grades of ductile iron have been studied, two as-cast and one heat-treated grade. The as-cast grades were 65-45-12 and 85-55-06. The heat-treated grade was quenched and tempered. The process was nominally for a 100-70-03 grade. Tensile bars were poured at their respective foundries, machined at a third party's facilities, tested for tensile and yield strengths and Vickers microhardness at the University of Missouri-Rolla. For the as-cast grades, the results show an Avrami distribution in the aging data that suggests the development of a new precipitate phase. The quenched and tempered iron did not show any aging characteristics. It is suspected in that case that aging occurred during the tempering process.
V. Richards et al., "Effects of Room Temperature Aging on Ductile Iron," Transactions of the American Foundry Society, American Foundry Society (AFS), Jun 2004.
Materials Science and Engineering
Keywords and Phrases
Vickers Hardness; Microhardness; Nodular Iron; Quenching and Tempering; Tensile Strength; Yield Strength
Article - Conference proceedings
© 2004 American Foundry Society (AFS), All rights reserved.