All Outputs (83)

Defect evolution in laser powder bed fusion additive manufactured components during thermo-mechanical testing (2017)
Conference Proceeding

The mechanical performance of additively manufactured (AM) components remains an issue, limiting the implementation of AM technologies. In this work, a new method is presented, to examine the evolution of defects in an Inconel 718 two-bar test specim... Read More about Defect evolution in laser powder bed fusion additive manufactured components during thermo-mechanical testing.

Meso-scale defect evaluation of selective laser melting using spatially resolved acoustic spectroscopy (2017)
Journal Article

Developments in additive manufacturing technology are serving to expand the potential applications. Critical developments are required in the supporting areas of measurement and in process inspection to achieve this. CM247LC is a nickel superalloy th... Read More about Meso-scale defect evaluation of selective laser melting using spatially resolved acoustic spectroscopy.

Staged thermomechanical testing of nickel superalloys produced by selective laser melting (2017)
Journal Article

The creep performance of additively manufactured components remains an issue before additive manufacturing can be put fully implemented. In this study, Inconel 718 two-bar specimens are produced by selective laser melting and subjected to a ‘staged’... Read More about Staged thermomechanical testing of nickel superalloys produced by selective laser melting.

Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces (2017)
Journal Article

Recent years have heralded the introduction of metasurfaces that advantageously combine the vision of sub-wavelength wave manipulation, with the design, fabrication and size advantages associated with surface excitation. An important topic within met... Read More about Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces.

Energy distribution modulation by mechanical design for electrochemical jet processing techniques (2017)
Journal Article

The increasing demand for optimised component surfaces with enhanced chemical and geometric complexity is a key driver in the manufacturing technology required for advanced surface production. Current methodologies cannot create complex surfaces in a... Read More about Energy distribution modulation by mechanical design for electrochemical jet processing techniques.

Electrolyte design for suspended particulates in electrolyte jet processing (2017)
Journal Article

The addition of particles (less than 1 μm) to electrolyte feedstocks results in marked changes to the morphology of deposits when electrolyte jet processing (EJP) compared to electrolyte only feedstocks. Through the use of a ‘carrier’ electrolyte in... Read More about Electrolyte design for suspended particulates in electrolyte jet processing.

Tribological behaviour of an electrochemical jet machinedtextured Al-Si automotive cylinder liner material (2017)
Journal Article

This paper investigates the use of Electrochemical Jet Machining to surface texture a hyper-eutectic Al-Si cylinder liner material. Samples were lapped to a 6?m finish followed by immersion in 1mol NaOH to expose the primary silicon colonies above th... Read More about Tribological behaviour of an electrochemical jet machinedtextured Al-Si automotive cylinder liner material.

Can Healthcare Assistant Training (CHAT) improve the relational care of older people? A developmental and feasibility study of a complex intervention (2017)
Journal Article

Background: Older people account for an increasing proportion of those receiving NHS acute care. The quality of healthcare delivered to older people has come under increased scrutiny. Healthcare assistants (HCAs) provide much of the direct care of ol... Read More about Can Healthcare Assistant Training (CHAT) improve the relational care of older people? A developmental and feasibility study of a complex intervention.

Fractal scan strategies for selective laser melting of ‘unweldable’ nickel superalloys (2017)
Journal Article

The high thermal gradients experienced during manufacture via selective laser melting commonly result in cracking of high γ/γ′ Nickel based superalloys. Such defects cannot be tolerated in applications where component integrity is of paramount import... Read More about Fractal scan strategies for selective laser melting of ‘unweldable’ nickel superalloys.

Controlling DC permeability in cast steels (2017)
Journal Article

Annealing (at multiple cooling rates) and quenching (with tempering) was performed on specimens of cast steel of varying composition. The aim was to devise a method for selecting the steel with the highest permeability, from any given range of steels... Read More about Controlling DC permeability in cast steels.

Assessing the capability of in-situ nondestructive analysis during layer based additive manufacture (2016)
Journal Article

Unlike more established subtractive or constant volume manufacturing technologies, additive manufacturing methods suffer from a lack of in-situ monitoring methodologies which can provide informationrelating to process performance and the formation of... Read More about Assessing the capability of in-situ nondestructive analysis during layer based additive manufacture.

Surface modification of mild steel using a combination of laser and electrochemical processes (2016)
Journal Article

Traditional methods for achieving hierarchical surface structures include highly specified, deterministic approaches to create features to meet design intention. In this study microstructural alteration was undertaken using laser apparatus and second... Read More about Surface modification of mild steel using a combination of laser and electrochemical processes.

In-situ synthesis of titanium aluminides by direct metal deposition (2016)
Journal Article

This study explores the capabilities of methods for in-situ synthesis of titanium aluminides using the Direct Metal Deposition process. This allows for the functional grading of components which will be required for next generation aerospace componen... Read More about In-situ synthesis of titanium aluminides by direct metal deposition.

Complex functional surface design for additive manufacturing (2016)
Conference Proceeding

This paper presents a new methodology for the creation of advanced surfaces which can be produced by Additive Manufacturing (AM) methods. Since there is no cost for enhanced complexity, AM allows for new capabilities in surface design. Micro-scale su... Read More about Complex functional surface design for additive manufacturing.

Loose powder detection and surface characterization in selective laser sintering via optical coherence tomography (2016)
Journal Article

Defects produced during selective laser sintering (SLS) are difficult to non-destructively detect after build completion without the use of X-ray-based methods. Overcoming this issue by assessing integrity on a layer-by-layer basis has become an area... Read More about Loose powder detection and surface characterization in selective laser sintering via optical coherence tomography.

Machining of additively manufactured parts: implications for surface integrity (2016)
Journal Article

Additive manufacturing methods continue to move towards production ready technologies with the widely extolled virtues of rapid transition from design to part and enhanced design freedoms. However, due to fundamental limitations of laser based proces... Read More about Machining of additively manufactured parts: implications for surface integrity.

Spatially resolved acoustic spectroscopy for selective laser melting (2016)
Journal Article

Additive manufacturing (AM) is a manufacturing technique that typically builds parts layer by layer, for example, in the case of selective laser melted (SLM) material by fusing layers of metal powder. This allows the construction of complex geometry... Read More about Spatially resolved acoustic spectroscopy for selective laser melting.

Quantification and characterisation of porosity in selectively laser melted Al–Si10–Mg using x-ray computed tomography (2016)
Journal Article

We used X-ray computed tomography (CT), microscopy and hardness measurements to study Al–Si10–Mg produced by selective laser melting (SLM). Specimens were subject to a series of heat treatments including annealing and precipitation hardening. The spe... Read More about Quantification and characterisation of porosity in selectively laser melted Al–Si10–Mg using x-ray computed tomography.

Electrolyte jet machining for surface texturing of Inconel 718 (2014)
Conference Proceeding

Electrolyte jet machining is an emerging non-conventional machining process which is capable of selectively applying multi-scale surface textures. Surfaces processed in this way do not suffer from thermal damage and hence this technique is highly sui... Read More about Electrolyte jet machining for surface texturing of Inconel 718.

Effect of prior laser microstructural refinement on the formation of amorphous layer in an Al86Co7.6Ce6.4 alloy (2014)
Journal Article

Laser surface melting (LSM) pre-treatment was conducted before large area electron beam (LAEB) treatment in an attempt to eliminate the cracking of the amorphous layer. In our previous work, LAEB treatment successfully generated an amorphous layer on... Read More about Effect of prior laser microstructural refinement on the formation of amorphous layer in an Al86Co7.6Ce6.4 alloy.