Investigation of microstructure within metal welds by energy resolved neutron imaging

A. S. Tremsin, W. Kockelmann, A. M. Paradowska, Shu Yan Zhang, A. M. Korsunsky, T. Shinohara, W. B. Feller, E. H. Lehmann

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number012040
JournalJournal of Physics: Conference Series
Volume746
Issue number1
DOIs
Publication statusPublished - 10 Oct 2016
Externally publishedYes
Event6th European Conference on Neutron Scattering, ECNS 2015 - Zaragoza, Spain
Duration: 30 Aug 20154 Sep 2015

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