Determination of martensite content and mapping phase distribution on Austempered Ductile Iron using energy-selective neutron imaging

• Published in: Materials characterization 2020-08, Vol.166, p.110453, Article 110453
• Main Authors: Soria, S.R., Li, X.H., Schulz, M., Boin, M., Hofmann, M.
• Format: Article
• Language: English
• Subjects: Austempered Ductile Iron; Barreling; Energy-Selective Neutron Imaging; TRIP effect
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2020.110453

The evolution of the martensite content in Austempered Ductile Iron during a uniaxial compression test at different strain levels was studied by energy-selective neutron imaging at a spatial resolution of 150 μm. The results obtained were compared to previous studies performed using neutron diffraction. Good agreement between these techniques was found. Phase maps of the martensite distribution in bulk samples have been acquired. The compressed samples show barrelling and an increase in martensite content was observed in the regions associated with higher deformation during compression tests, indicating that friction between the samples and compression platens affects the spatial martensite distribution. •Martensite distribution in compressed samples was obtained with 150 μm of resolution.•Martensite has an inhomogeneous distribution in the samples due to the barrelling.•The estimated friction between sample/platen was different at different strain level.•Good correlation between neutron diffraction and neutron imaging results was observed.•Texture correction must be considered to increase the accuracy of Bragg Edge analysis.