Estudio del acero inoxidable 17-4ph nitrurado a plasma a baja temperatura, usando la tecnología de tela activa
Esta investigación caracterizó muestras del acero 17-4PH nitruradas a plasma a una temperatura de 400ºC usando el tratamiento a plasma pulsado sin tela activa (DCPN) y con tela activa (ASPN). Siendo así estudiadas la nitruración con tela activa con la matriz en dos condiciones de partida diferente:...
- Autores:
-
Varela Larrotta, Sharys Ivonn
- Tipo de recurso:
- http://purl.org/coar/version/c_b1a7d7d4d402bcce
- Fecha de publicación:
- 2016
- Institución:
- Universidad Industrial de Santander
- Repositorio:
- Repositorio UIS
- Idioma:
- spa
- OAI Identifier:
- oai:noesis.uis.edu.co:20.500.14071/34926
- Palabra clave:
- Nitruración A Plasma Sin Tela Activa (Dcpn)
Nitruración A Plasma Con Tela Activa (Aspn)
Solubilización
Envejecido
Martensita Expandida-N-Fe4N Y Nitruro De Cromo Cr2N.
This work aimed the characterization of samples of 17-4PH steel plasma nitrided at low temperature 400 °C using a conventional DC pulsed plasma source (DCPN) and by a new nitriding route so called Active Screen Plasma Nitriding (ASPN). Two initial conditions for the bulk steel were assessed: a solution treated condition and the combination of solubilization + precipitation hardening (PH) treatments. The concept of plasma nitriding at low temperatures has been conceived in order to avoid the precipitation of nitrides
which in turn impairs the corrosion resistance of the nitrided case. Additionally
the purpose of the active screen route is to avoid border effects that lead to formation of and inhomogeneous layer along the sample's surface. The characterization of the samples before and after the nitriding treatments were performed using optical and electronic microscopy
X-ray diffraction
Vickers microhardness and wavelength-dispersive X-ray spectroscopy (WDS)
the later for determination of nitrogen content profiles. The micromechanical properties of the produced cases were also characterized by means of instrumented linear sclerometry
providing their critical failure loads and friction coefficients. Results showed that the nitriding treatment with active screen produced homogeneous nitrided the nitrided case produced on the sample previously solution treated only provided lower values of hardness and nitrogen content in comparison to the PH sample. It was found that this difference could be explained due to the effect of copper on the chemical activity of nitrogen in the alloy. On other hand
in the DCPN nitrided samples it was observed the formation of an inhomogeneous case N and iron and chromium -Fe4N and Cr2N
respectively
- Rights
- License
- Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)