In situ studies of intercritically austempered ductile iron using neutron diffraction

Alan P. Druschitz, Ricardo E. Aristizabal, Edward Druschitz, C. R. Hubbard, Thomas R. Watkins, Walker L. Walker, Mel Ostrander

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Intercritically austempered ductile irons hold promise for applications requiring fatigue durability, excellent castability, low production energy requirements, reduced greenhouse gas emissions, and excellent machinability. In the present study, four different ductile iron alloys, containing manganese and nickel as the primary austenite-stabilizing elements, were heat treated to obtain different quantities of austenite in the final microstructure. This article reports the microstructures and phases present in these alloys. Furthermore lattice strains and diffraction elastic constants in various crystallographic directions and the transformation characteristics of the austenite were determined as a function of applied stress using in situ loading during neutron diffraction at the second generation Neutron Residual Stress Facility at the High Flux Isotope Reactor at Oak Ridge National Laboratory.

Original languageEnglish
Pages (from-to)1468-1476
Number of pages9
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume43
Issue number5
DOIs
StatePublished - May 2012

Funding

The authors would like to thank John Griffin and the UAB casting group for assistance in preparing the cast alloys, Webb Wheel (Cullman, AL) for performing the chemical analysis and CA Tooling (Lynchburg, VA) for machining the special tensile specimens for the neutron diffraction experiments. This research at the ORNL’s HTML was sponsored by the U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program. Research at the NRSF2 at the HFIR was partially sponsored by the U.S. DOE, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program, through the ORNL’s HTML User Program and by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. DOE. Notice: This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. DISCLAIMER NOTICE: This document was prepared by Alan P. Druschitz, Ricardo Aristizabal, and Edward Druschitz as a result of the use of facilities of the U.S. DOE that are managed by UT-BAT-TELLE, LLC. Neither UT-BATTELLE, LLC, DOE, or the United States Government, nor any person acting on their behalf: (1) makes any warranty or representation, express or implied, with respect to the information contained in this document; or (2) assumes any liabilities with respect to the use of, or damages resulting from the use of, any information contained in the document. Co-author Ricardo Aristizabal is an Assistant Professor of the University of Antioquia in Medellin Colombia; he is currently a Ph.D. candidate at the University of Alabama at Birmingham.

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