A5024096731- High Temperature Alloys and Creep
- Nuclear Materials and Properties
- Welding Techniques and Residual Stresses
- Additive Manufacturing Materials and Processes
- Nuclear Physics and Applications
- High-Temperature Coating Behaviors
- Microstructure and Mechanical Properties of Steels
- Aluminum Alloy Microstructure Properties
- Hydrogen embrittlement and corrosion behaviors in metals
- Metallurgical Processes and Thermodynamics
- Solidification and crystal growth phenomena
- High Entropy Alloys Studies
- Microstructure and mechanical properties
- High-Velocity Impact and Material Behavior
- Fatigue and fracture mechanics
- Non-Destructive Testing Techniques
- Advanced Welding Techniques Analysis
- Fusion materials and technologies
- Ultrasound and Cavitation Phenomena
- Metal Alloys Wear and Properties
- Metal and Thin Film Mechanics
- Advanced materials and composites
- Intermetallics and Advanced Alloy Properties
- Metallurgy and Material Forming
- Material Properties and Failure Mechanisms
Rutherford Appleton Laboratory
2016-2024
Science and Technology Facilities Council
2017-2023
University of Hull
2013-2021
National Tsing Hua University
2019
Ultrasound processing of metal alloys is an environmental friendly and promising green technology for liquid degassing microstructural refinement. However many fundamental issues in this field are still not fully understood, because the difficulties direct observation dynamic behaviours caused by ultrasound inside semisolid metals during solidification processes. In paper, we report a systematic study using ultrafast synchrotron X-ray imaging (up to 271,554 frame per second) technique...
Current experimental and numerical quantification methods are limited in their ability to full-field mapping of the unpredictable distribution all residual stress permanent plastic strain components additive manufacturing parts with discontinuous processing properties. To address this limitation, a tomographic eigenstrain (inherent strain) reconstruction method, that merges diffraction tomography for volumetric eigenstrains corresponding elastic deformations like stresses non-destructively...
The reconstruction of welding residual stresses has been performed based on the assumption continuous processing conditions, owing to limitations methods. This prevents attainment a comprehensive understanding mechanical deformations in entire weld zone. voxel-based eigenstrain (inherent strain) method emerges as an appropriate approach for full-field finite length weldments without such assumption. innovative capability this advanced is presented study, aiming comprehend all components and...
The fatigue fragmentation of dendritic structures a SCN-5 wt .% Camphor transparent alloy in an ultrasound field was investigated systematically using high-speed imaging. Dynamic interactions between oscillating ultrasonic bubbles and the primary secondary dendrites were observed recorded. High speed images show that when bubble trapped inside interdendritic region, oscillation can cause cyclic bending arms. Consequently, type crack initiated at arm root propagated through dendrite, causing...
The cold neutron imaging and diffraction instrument IMAT at the second target station of pulsed source ISIS is currently being commissioned prepared for user operation. will enable white-beam radiography tomography. One benefits operating on a to determine energy via time flight measurement, thus enabling energy-selective energy-dispersive imaging, maximizing image contrasts between given materials mapping structure microstructure properties. We survey hardware software components data...
Abstract Considerable progress has been made in studying the mechanism and effectiveness of using ultrasound waves to manipulate solidification microstructures metallic alloys. However, uncertainties remain both underlying physics how evolve under ultrasonic waves, best technological approach control final properties. We used ultrafast synchrotron X-ray phase contrast imaging facility housed at Advanced Photon Source, Argonne National Laboratory, US study situ highly transient dynamic...
In super duplex stainless steels (SDSSs), both austenite and ferrite are susceptible to hydrogen embrittlement, however there is a lack of understanding into the effect in each phase. this study, neutron diffraction was applied on hydrogen-charged (H-charged) samples investigate embrittlement behaviour steels. The result reveals that maintains good plasticity during tensile testing, whilst loss it realised ferrite. Fractography analysis diffusion induced brittle-to-ductile transition from...
Abstract Polycrystalline Ni-base superalloy Inconel 718 derives the strengthening mainly from Ni 3 Nb γ ″ phase. To investigate evolution of lattice spacing precipitates, in situ neutron diffraction experiments were performed during aging heat treatment two bar samples at 780 °C for 8 hours. One sample was aged with a negligible applied stress (5 MPa) and other an tensile 300 MPa. The data demonstrate three stages due to compositional morphological changes aging. (1) Stage I, decreases...
To improve the understanding of high temperature mechanical behaviours LPBF Ni-based superalloys, this work investigates influence an elongated grain structure and characteristic crystallographic texture on anisotropic tensile in Hastelloy X (HX) at 700 °C. Two types loading conditions have been examined to analyse anisotropy related building direction (BD), including vertical (loading direction//BD) horizontal ⊥ BD). probe short-term creep behaviours, slow strain rate testing (SSRT) has...
Abstract Misfit stresses in the γ ″-strengthened Ni-base superalloy Inconel 718 were calculated from measured constrained misfit strain using Eshelby’s inclusion method. The strains of ″ precipitates neutron diffraction at various temperatures with aid stress-induced variant selection Eshelby tensor was expressions for case anisotropic matrix given by Mura. Results show presence significant compressive an distribution, namely 3.0 GPa along habit plane and 1.7 normal direction room...
The effects of vacuum induction melting (VIM) (<1 Pa–100 Pa) on gas content, oxide inclusions and mechanical properties Ni-based superalloy K4648 has been investigated by electron beam (EB) button experiment under high (10-3 resolution synchrotron X-ray powder diffraction (SXPD). results indicated that VIM remelting drop obvious effect the existing form trace oxygen. total amount oxygen did not increase significantly but a dramatic in 1–2 orders magnitude was found. are mainly oxides...
The dynamics of ultrasonic bubbles in liquid metal are captured in-situ for the first time using ultrafast X-ray phase contrast imaging facility housed at Advanced Photon Source, Argonne National Laboratory, USA. experimental observations complemented by simulations acoustic pressure field, bubble diameter oscillation and associated velocity pulses wall due to alternating wave. experiment simulation agree well provide more quantitative insight into understanding highly transient behaviour...
The data presented in this article are related to the paper entitled 'Ultrafast synchrotron X-ray imaging studies of microstructure fragmentation solidification under ultrasound' [Wang et al., Acta Mater. 144 (2018) 505-515]. This provides further supporting information and analytical methods, including from both experimental numerical simulation, as well Matlab code for processing images. Six videos constructed processed images also provided.