Detecting the influence of heat sources on material properties when producing aviation parts by a direct energy deposition method
Keywords:additive technologies, plasma surfacing, direct growth, cold metal transfer
Quality of the material obtained by the method of direct energy deposition using three heat sources (plasma arc, electric welding arc and welding arc with cold metal transfer) was studied. AlMg5 alloy wire was used as the filler material.
The study was conducted to establish at what heat source the deposited material will have the highest physical and mechanical characteristics and performance. It was also necessary to assess quality, size and uniformity of distribution of the deposited layers since these indicators determine accuracy of the resulting product and make it possible to reduce machining allowance.
Influence of heat sources on formation of surface of deposited plates was revealed: the specimens obtained by the method of plasma surfacing had protrusion height of the deposited layers on the side surface up to 2 mm, the specimens obtained by the method of electric arc and CMT surfacing had protrusion height of 0.5 mm. The obtained data will enable determination of the minimum allowable machining allowance.
Analysis of chemical composition has shown that each heat source ensured chemical composition of the finished product corresponding to chemical composition of original material. Distribution of alloying elements was uniform among the deposited layers. However, the CMT process provided the most accurate distribution of alloying elements.
Physical and mechanical properties of the plates obtained by the direct growth method were approximately at the same level with the materials obtained using conventional methods of casting and pressing.
The specimens obtained by the method of plasma surfacing had the highest values of mechanical properties: σt=28 MPa; σ0.2=15 MPa; δ=30.4 % which can be explained by a more dispersed structure and a high level of fusion of the deposited layers.The obtained data will make it possible to determine which heat source is more expedient to use in order to obtain properties necessary for a concrete technological process. They also make it possible to evaluate applicability of the method of direct growth using arc heat sources in mass production of parts
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Copyright (c) 2019 Mikhail Gnatenko, Pavel Zhemanyuk, Igor Petryk, Sergey Sakhno, Sergey Chigileichik, Valery Naumik, Alexander Ovchinnikov, Maria Matkovskaya
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