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|Title: ||Comparison of the effects of a conventional heat treatment between cast and selective laser melted IN939 alloy|
|Authors: ||Philpott, Will|
Jepson, Mark A.E.
Thomson, Rachel C.
|Issue Date: ||2016|
|Publisher: ||© Electric Power Research Institute (EPRI). Distributed by ASM International|
|Citation: ||PHILPOTT, W., JEPSON, M.A.E., and THOMSON, R.C., Comparison of the effects of a conventional heat treatment between cast and selective laser melted IN939 alloy. IN: Parker, J., Shingledecker, J. and Siefert, J. (eds). Advances in Materials Technology for Fossil Power Plants, Proceedings from the Eight International Conference (EPRI 2016), Albufeira, Algarve, Portugal, 11-14 October 2016.|
|Abstract: ||Additive manufacturing (AM) is a process where, as the name suggests, material is added during production, in contrast to techniques such as machining, where material is removed. With metals, AM processes involve localised melting of a powder or wire in specific locations to produce a part, layer by layer. AM techniques have recently been applied to the repair of gas turbine blades. These components are often produced from nickel-based superalloys, a group of materials which possess excellent mechanical properties at high temperatures. However, although the microstructural and mechanical property evolution during the high temperature exposure of conventionally produced superalloy materials is reasonably well understood, the effects of prolonged high temperature exposure on AM material are less well known.
This research is concerned with the microstructures of components produced using AM techniques and an examination of the effect of subsequent high temperature exposures. In particular, the paper will focus on the differences between cast and SLM IN939 as a function of heat treatment and subsequent ageing, including differences in grain structure and precipitate size, distribution and morphology, quantified using advanced electron microscopy techniques.|
|Description: ||This article is made available as an electronic reprint with the permission of ASM International for the Loughborough University Institutional Repository. Reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this article for a fee or for commercial purposes, or modification of the content of this article is prohibited.|
|Sponsor: ||We would like to acknowledge the support of the Engineering and Physical Research Council (EPSRC) for their support for the project - Flexible and Efficient Power Plant: Flex-E-Plant (Grant number: EP/K021095/1). We also thank the following partners for their valuable contributions: GE Power, Doosan Babcock Limited, Centrica plc., EDF Energy (West Burton Power) Limited., Uniper Technology Limited, Goodwin Steel Castings Limited, NPL Management Limited, R-MC Power Recovery Limited., RWE Generation UK plc., Scottish and Southern Energy (SSE) plc., Siemens Industrial Turbomachinery, and TWI Limited. We also acknowledge the support of the Loughborough Materials Characterisation Centre (LMCC).|
|Version: ||Accepted for publication|
|Publisher Link: ||http://www.asminternational.org/home/-/journal_content/56/10192/26991842/PUBLICATION/|
|Appears in Collections:||Conference Papers and Presentations (Materials)|
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