Abstract
A special additive manufacturing (AM), called as Direct Metal Laser Sintering (DMLS), is a technology that produces 3D workpieces using a wide range of different metals as raw materials. The aim of current research is to investigate the plasma nitriding effect on the DMLS produced samples. The direct current plasma nitriding treatment was achieved at 440 °C for 4 hours with 75%N2 – 25%H2 gas mixture. Before the treatment, the 316L austenitic stainless steels samples were ground with different methods to modify the surface roughness. Scanning electron microscope (SEM), X-ray diffractometer, glow discharge optical electron spectroscopy, Vickers microhardness tester and potentiodynamic corrosion test were used for the characterization of surface properties. The results demonstrated that the surface roughness did not affect the outcome of the plasma nitriding, but the corrosion resistance increases with the decrease of the surface roughness compared to the untreated 3D sample.
Highlights
Due to technology development, there are more and more opportunities to create materials with different geometries
The results show the hardness is even along the nitrided layer, the hardness decreased to the substrate hardness under the modified layer
Plasma nitriding was used to investigate the effects on the Direct Metal Laser Sintering (DMLS) produced surface
Summary
There are more and more opportunities to create materials with different geometries. Development within traditional subtractive processes exists, and within additive processes The latter technology is widely used in industries, universities, and medicines. At the point of the laser beam impact, the metallic powder is locally melted, whereby the underlying layer is over melted and solidified [10,11,12,13]. This continues until the product will be done. Parts of even smallmoderate size may require more than 6-12 hours of processing Another concern is the part accuracy, which needs to be kept as high as possible. Other disadvantages of the technology are the porosity and the significant microstructure defects, but these can be reduced by optimizing the parameters [16]
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