Neutron Diffraction Studies of Intercritically Austempered Ductile Irons 2011-01-0033
Neutron diffraction is a powerful tool that can be used to identify the phases present and to measure the spacing of the atomic planes in a material. Thus, the residual stresses can be determined within a component and/or the phases present. New intercritically austempered irons rely on the unique properties of the austenite phase present in their microstructures. If these materials are to see widespread use, methods to verify the quality (behavior consistency) of these materials and to provide guidance for further optimization will be needed. Neutron diffraction studies were performed at the second generation neutron residual stress facility (NRSF2) at the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory on a variety of intercritically austempered irons. For similar materials, such as TRIP steels, the strengthening mechanism involves the transformation of metastable austenite to martensite during deformation. For the intercritically austempered ductile irons two different deformation/strengthening mechanisms, phase transformation and slip, dependent upon the iron chemistry, were observed. Lattice strain and phase fraction data as a function of applied stress are presented.
Citation: Druschitz, A., Aristizabal, R., Druschitz, E., Hubbard, C. et al., "Neutron Diffraction Studies of Intercritically Austempered Ductile Irons," SAE Int. J. Mater. Manuf. 4(1):111-118, 2011, https://doi.org/10.4271/2011-01-0033. Download Citation
Author(s):
Alan Druschitz, Ricardo Aristizabal, Edward Druschitz, Camden Hubbard, Thomas Watkins
Affiliated:
University of Alabama Birmingham, Oak Ridge National Laboratory
Pages: 8
Event:
SAE 2011 World Congress & Exhibition
ISSN:
1946-3979
e-ISSN:
1946-3987
Also in:
SAE International Journal of Materials and Manufacturing-V120-5, SAE International Journal of Materials and Manufacturing-V120-5EJ
Related Topics:
Iron
Slip
Optimization
Tools and equipment
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