期刊
POWDER METALLURGY
卷 58, 期 4, 页码 259-264出版社
MANEY PUBLISHING
DOI: 10.1179/0032589915Z.000000000250
关键词
Selective Laser Melting; Inconel 718; Encapsulation; Hot Isostatic Pressing; HVOF; Arc-PVD
资金
- German Research Foundation (DFG) Hochtemperaturermudungsverhalten von konventionellen sowie im Laserschmelzverfahren hergestellten, beschichteten, heissisostatisch gepressten Nickelbasis-Hochtemperaturlegierungen'' [Ti343/70-1, Ni1327/4-1]
In this study, the Selective Laser Melting (SLM) technology was used to manufacture flat specimens from Inconel 718 powder. The SLM process parameters have amajor impact on the microstructure aswell as on the mechanical properties of the fabricated specimens. Despite using optimized processing parameters, defects like pores cannot be completely avoided. These pores act as stress raisers and lead to premature crack initiation under cyclic loading, eventually reducing the fatigue strength of the material. Hot Isostatic Pressing (HIP) offers the possibility to eliminate the porosity and thus to increase the fatigue performance of the material. HIP combines high pressure and high temperature to produce materials with superior properties. Unfortunately, open porosity, i.e. open pores on the surface, can prevent full densification. In the present work, SLM flat specimens were encapsulated by means of Cathodic Arc Deposition (Arc-PVD) and High Velocity Oxygen Fuel Spraying (HVOF) to seal open pores. For this purpose, different encapsulation materials were investigated with a focus on materials offering additional functions such as an improved high temperature corrosion resistance or applicability as a bond coat for thermal barrier coatings.
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