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Modelling and neutron diffraction characterization of the interfacial bonding of spray formed dissimilar steels

DOI: 10.1016/j.actamat.2018.05.055 DOI Help

Authors: T. L. Lee (ISIS Neutron Source; University of Hull) , J. Mi (University of Hull) , S. Ren (Baosteel Co. Ltd) , S. Zhao (Baosteel Co. Ltd) , J. Fan (Baosteel Co. Ltd) , S. Kabra (ISIS Neutron Source) , S. Zhang (ISIS Neutron Source; Centre of Excellence for Advanced Materials, China) , P. S. Grant (University of Oxford)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Acta Materialia , VOL 155 , PAGES 318 - 330

State: Published (Approved)
Published: August 2018
Diamond Proposal Number(s): 9974

Open Access Open Access

Abstract: The spray forming of thick, dissimilar steel clad tubes with the objective of achieving a high integrity metallurgical bond across the cladding-substrate interface able to withstand residual stresses and subsequent thermo-mechanical processing was investigated by large scale experiments, modelling and extensive microstructural characterization including microscopy, X-ray tomography, neutron scattering and mechanical testing. The simulated residual stress distributions across the cladding-substrate interface, accounting for any as-sprayed porosity and the distribution of martensitic and retained austenite phases, were compared with neutron diffraction measurements and differences used to infer the load transfer behaviour and thus the mechanical integrity of the interface. The mechanical properties of the interfaces were then also measured directly by shear testing. The link between substrate pre-heating, the spray forming temperature, and the resulting preform temperature, porosity, phase fractions, residual stress, strength and integrity of the interface were established and quantified explicitly.

Journal Keywords: Finite element modelling, Neutron diffraction, Spray forming, Residual stresses, Dissimilar steels

Subject Areas: Materials, Engineering, Technique Development

Instruments: I13-2-Diamond Manchester Imaging

Other Facilities: Swiss Light Source

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