Age-Strengthening of Cast Iron and Its Effects on Machinability: Review of the Literature

Abstract

This presentation is a review of the research performed over several years to characterize the age-strengthening behavior of graphitic cast iron alloys (gray iron, ductile iron and CG iron.) Nitrogen in metastable solid solution in ferrite is necessary for the age strengthening to occur, similar to quench aging of steels. The activation energy for age strengthening is similar to that for diffusion of nitrogen. Age-strengthening can occur even if the ferrite is present as a phase in pearlite. However, machinability benefits only occur when there is free ferrite in the microstructure.

Meeting Name

Advances in the Science and Engineering of Casting Solidification: An MPMD Symposium Honoring Doru Michael Stefanescu - TMS 144th Annual Meeting and Exhibition (2015: Mar. 15-19, Orlando, FL)

Department(s)

Materials Science and Engineering

Keywords and Phrases

Age strengthening; Cast iron; Machinability; Activation energy; Ferrite; Iron research; Nitrogen; Solidification; Strengthening (metal); Gray irons; Metastable solid solution; Quench aging

International Standard Book Number (ISBN)

978-1119082385

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2015 Minerals, Metals and Materials Society (TMS), All rights reserved.

Publication Date

01 Mar 2015

Link to Full Text

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