AISTech 2022

Interpreting X-Ray Absorption and Diffraction Contrast for Massive Non-Destructive 3D Grain Mapping of Steel and Other Alloys in Laboratory-Computed Tomography and X-Ray Microscopy (Room 310)

17 May 22
10:30 AM - 11:00 AM

Tracks: Metallurgy - Processing, Products & Applications

Speaker(s): Andy Holwell, Manager Business Sector Industrial Research, ZEISS Research Microscopy Solutions; Hrishikesh Bale, ZEISS Research Microscopy Solutions

Conventional computed tomography or x-ray microscopy is limited to microstructural imaging via material density differences. As such, single-phase polycrystalline materials (e.g., alloys) do not exhibit absorption contrast to reveal underlying grain microstructure. For 3D microstructural crystallography, metallurgists must use synchrotron crystallography or electron backscatter diffraction in electron microscopy. This paper will show how laboratory-based diffraction contrast tomography (DCT) can extract 3D crystallographic information from single-phase polycrystalline samples non-destructively. DCT scans collect x-ray diffraction patterns which are deconvoluted for reconstruction, providing grain maps carrying information on grain morphology, orientation, size and centroid position, for studies of grain growth, tensile testing and anisotropy.