Browsing by Author "James, William"

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    Characterisation of Wire Arc Additive Manufactured Superalloys
    (Cranfield University, 2024-02-16 15:47) James, William
    Characterisation of two superalloys to understand the response of Wire Arc Additive Manufactured (WAAM) superalloys for high temperature applications. With an aim to understand if machine hammer peening (MHP) can be used to obtain a performance similar to the wrought alloys.
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    Data "WAAM of a complex superalloy component"
    (Cranfield University, 2025-03-10) James, William; Pardal, Goncalo; Ganguly, Supriyo
    Wire Arc Additive Manufacturing complex Inconel 718 superalloy component. Research explored the feasibility of additively manufacturing superalloy components for high-speed flight and methods to enhance the performance of Wire Arc AM superalloy components.
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    High temperature performance of wire-arc additive manufactured Inconel 718
    (Nature, 2023-03-20) James, William; Ganguly, Supriyo; Rodrigues Pardal, Goncalo
    In developing a wire-arc directed energy deposition process for superalloys used in high-speed flight environments, Inconel 718 was deposited using a plasma arc process and tested for its high temperature performance. The deposited material was tested in both the as deposited condition and after an age-hardening industry standard heat-treatment for this alloy. Results showed a reduced performance in both deposited conditions, with heat-treated material significantly outperforming as deposited material up to 538 °C. The difference in performance was less significant from 760 to 1000 °C, owing to an in-test aging process which increased the performance of the as deposited material. The microstructure of deposited material showed significant cracking throughout the alloy and formation of secondary phases throughout the matrix, with significantly more precipitation after heat-treating.
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    Microstructure and Mechanical Properties of Inconel 718 and Inconel 625 Produced Through The Wire + Arc Additive Manufacturing Process
    (Cranfield University, 2022-01-12T12:26:44Z) James, William
    In developing the wire + arc additive manufacturing (WAAM) process for heat resistant alloys used in high-speed flight applications, structures were built from nickel-based superalloys Inconel 718 (IN718) and Inconel 625 (IN625). In this paper, wall structures were deposited in both superalloys, using a plasma transferred arc process. The microstructure was analysed optically and under SEM; both alloys were seen to be of typical dendritic structure with long columnar grains, with little variation between the alloys. The findings suggest that the structures included significant segregation of heavy metals, with potential Laves phases and δ-phases also found across the alloys, which showed significantly more segregation of Nb and Mo at the grain boundaries and inter-dendritic regions. The alloys also underwent room temperature mechanical testing, in addition to this IN625 specimens were tested after a solutionising and ageing treatment. Hardness measurements indicated that in general the WAAM process has the effect of increasing material hardness by approximately 10%, when compared to wrought alloy in a solutionised state. In IN625 the heat-treated specimens showed an increase in hardness of around 6%, when compared with its as-deposited condition. Elongation in IN625 showed much greater values. Overall, IN718 showed a greater strength with less elongation than IN625. A comparison between both alloys and their stated maximum UTS and YS values from literature revealed that WAAM built IN718 and IN625 in its as-deposited condition can achieve just over half the maximum achievable UTS, with no post-process treatment. The heat-treatment process tested in IN625 marginally reduced the gap in UTS performance by 3.5%.
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    Rene 41 Raw Tensile Data
    (Cranfield University, 2022-06-24 18:12) James, William; Ganguly, Supriyo; Rodrigues Pardal, Goncalo
    Raw tensile testing data of nickel superalloy Rene 41, manufactured using a plasma wire-arc directed energy deposition process.
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    Rene 41 Tensile Data
    (Cranfield University, 2022-06-24 18:12) James, William; Ganguly, Supriyo; Rodrigues Pardal, Goncalo
    Tensile testing data of nickel superalloy Rene 41, manufactured using a plasma wire-arc directed energy deposition process.