TY - JOUR
T1 - Neutron Diffraction Studies of Intercritically Austempered Ductile Irons
AU - Druschitz, Alan
AU - Aristizabal, Ricardo
AU - Druschitz, Edward
AU - Hubbard, Camden
AU - Watkins, Thomas
PY - 2011/4
Y1 - 2011/4
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=79959577009&partnerID=8YFLogxK
U2 - 10.4271/2011-01-0033
DO - 10.4271/2011-01-0033
M3 - Article
AN - SCOPUS:79959577009
SN - 1946-3979
VL - 4
SP - 111
EP - 118
JO - SAE International Journal of Materials and Manufacturing
JF - SAE International Journal of Materials and Manufacturing
IS - 1
ER -