Measuring Residual Strain and Stress in Thermal Spray Coatings Using Neutron Diffractometers

N. H. Faisal, R. Ahmed, A. K. Prathuru, A. Paradowska, T. L. Lee

Research output: Contribution to journalReview articlepeer-review

Abstract

Background: During thermal spray coating, residual strain is formed within the coating and substrates due to thermo-mechanical processes and microstructural phase changes.

Objective: This paper provides a comprehensive guide to researchers planning to use neutron diffraction technique for thermal spray coatings, and reviews some of these studies.

Methods: ENGIN-X at the ISIS spallation source is a neutron diffractometer (time-of-flight) dedicated to materials science and engineering with high resolution testing. The focus is on the procedure of using ENGIN-X diffractometer for thermal spray coatings with a view that it can potentially be translated to other diffractometers.

Results: Number of studies involving neutron diffraction analysis in thermal spray coatings remain limited, partly due to limited number of such strain measurement facilities globally, and partly due to difficulty is applying neutron diffraction analysis to measure residual strain in the thermal spray coating microstructure.

Conclusions: This technique can provide a non-destructive through-thickness residual strain analysis in thermally sprayed components with a level of detail not normally achievable by other techniques. Neutron sources have been used to measure strains in thermal spray coatings, and here, we present examples where such coatings have been characterised at various neutron sources worldwide, to study residual strains and microstructures.

Original languageEnglish
JournalExperimental Mechanics
Early online date10 Nov 2021
DOIs
Publication statusE-pub ahead of print - 10 Nov 2021

Keywords

  • ENGIN-X
  • Neutron diffraction techniques
  • Neutron diffractometers
  • Residual strain
  • Residual stress
  • Thermal spray coatings

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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