Investigation of microstructure within metal welds by energy resolved neutron imaging

6th European Conference on Neutron Scattering

Tremsin, A.S.^1 ; Kockelmann, W.^2 ; Paradowska, A.M.^3 ; Zhang, Shu-Yan^2 ; Korsunsky, A.M.^4 ; Shinohara, T.^5 ; Feller, W.B.^6 ; Lehmann, E.H.^7

University of California at Berkeley, Berkeley

CA

94720, United States^1

STFC, Rutherford Appleton Laboratory, ISIS Facility, Didcot

OX 110QX, United Kingdom^2

Australian Nuclear Science and Technology Organization, Lucas Heights

NSW

2232, Australia^3

Department of Engineering Science, University of Oxford, Oxford

OX 13PJ, United Kingdom^4

Japan Atomic Energy Agency, 2-4 Shirakata-shirane Tokai-mura, Naka-gun Ibaraki

319-1195, Japan^5

NOVA Scientific, Inc., 10 Picker Rd., Sturbridge

MA

01566, United States^6

Paul Scherrer Institute, Villigen

CH-5232, Switzerland^7

关键词: Elemental compositions;    Micro-structure parameters;    Neutron transmission;    Neutron wavelengths;    Pulsed neutron sources;    Resonance absorption;    Simultaneous acquisition;    Spatial resolution;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/746/1/012040/pdf
DOI  :  10.1088/1742-6596/746/1/012040

来源: IOP

【 摘 要 】

The recent development of bright pulsed neutron sources and high resolution neutron counting detectors enables simultaneous acquisition of a neutron transmission spectrum for each pixel of the image. These spectra can be used to reconstruct microstructure parameters within welds, such as strain, texture and phase composition through Bragg edge analysis, and in some cases elemental composition through resonance absorption analysis. In this paper we demonstrate the potential of energy-resolved neutron imaging to study the microstructures of two steel welds, where the spatial distribution of residual strain within the welds, as well as some information on the texture, are obtained with sub-mm spatial resolution. A friction stir weld of two steel plates and a conventional weld of two steel pipes were studied at pulsed neutron facilities, where a Δλ/λ resolution as low as 0.2% can be attained over a wide range of neutron wavelengths ranging from 0.5 Å to 8 Å.