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6602 |
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Pulsed PTA additive manufacturing of Ni alloy type 625 |
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Pavel Rohan* / Czech Technical University, Czech Republic Stanislav Krum / CTU in Prague, Faculty of Mechanical Engineering, Czech Republic Zdenek ; Pitrmuc/ CTU in Prague, Faculty of Mechanical Engineering, Czech Republic Karolína Adámková/ CTU in Prague, Faculty of Mechanical Engineering, Czech Republic Tomas Gurík/ CTU in Prague, Faculty of Mechanical Engineering, Czech Republic Jan Nestával/ CTU in Prague, Faculty of Mechanical Engineering, Czech Republic |
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Pulsed Plasma Transferred Arc (pulsed PTA) surfacing is rated for its high-energy concentration, low heat input and low dilution, which are advantageous characteristics for protective layer deposition. These characteristics are also beneficial for additive manufacturing production of near net shapes by direct metal deposition by plasma. The plasma arc techniques provide opportunities for much greater deposition rates compared to laser and electron beams. Nickel alloys are used for a wide variety of applications, the majority of which involve corrosion resistance and/or heat resistance. Some of these include aircraft gas turbines, steam turbine power plants and medical applications. Ni-alloy based on Inconel 625 in powder form was used for layer by layer additive manufacturing. Various sets of parameters have been used to create nickel alloy deposits on austenitic steel base material. The basic geometrical characteristics of the deposits were measured. Welded material was studied in terms of structure with respect to the direction of welding by optical and electron microscopy. The mechanical properties of the deposited material were measured in two different directions. The chemical composition of the base material and the weld deposit was detected by XRF and the phase composition by XRD. Pulsed PTA surfacing has been found to be a suitable method for forming near net shaped parts from nickel alloy type 625. |