Abstract No.:
2854

 Scheduled at:
Tuesday, September 27, 2011, Saal C2.2 2:25 PM
Characterization & Testing 1


 Title:
Experimental study of stainless steel 316L coatings on light alloys obtained by cold gas spray

 Authors:
Sergi Dosta / Thermal Spray Centre (CPT) - Universitat de Barcelona, SPAIN
MarĂ­a Villa*/ CPT Thermal Spray Centre, Spain
Javier Fernandez/ CPT Thermal Spray Centre, Spain
Josep M. Guilemany/ CPT Thermal Spray Centre, Spain

 Abstract:
The use of light alloys in industries such as aerospace, transport and biomedical devices has increased exponentially in the last years as much as surface engineering technologies to enhance their properties for the desired end use. The austenitic structure of grade 316L stainless gives excellent toughness, even down to cryogenic temperatures. Compared to chromium-nickel austenitic stainless steels, 316L stainless steel offers higher creep, stress to rupture and tensile strength at elevated temperatures. The main objective of the study is to obtain coatings that increase the wear resistance of light alloys.

In the present work, the influence of pressure, temperature and particle morphology in the coating structure has been studied for the deposition of stainless steel onto light alloys. A factorial experiment design, to determine the range of values and the influence of these parameters, has been developed for both morphologies.

Different sets of parameters have been tested in order to optimize the process regarding thickness, porosity, hardness and adherence of the coatings. The obtained coatings have been characterized using optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction. Coatings hardness have been characterized with microindentation, and the young modulus and other mechanical properties with nanoindentation technique. Better wear resistance results have been obtained in comparison with the studied light alloys.


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