Characterization of nickel diffusion and its effect on the microstructure of nickel PM steels
| Autor: | Carl Blais, Bernard Tougas, François Chagnon, Sylvain Pelletier |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
inorganic chemicals
Diffusion mechanisms Materials science Microstructures and properties chemistry.chemical_element Sintered parts Thermal diffusivity Diffusion Powder metallurgy Nickel otorhinolaryngologic diseases Heterogeneous microstructure Grain boundary diffusion coefficient Grain-boundary diffusion Microstructure Structural material Metallurgy Metals and Alloys Nickel powder metallurgy Condensed Matter Physics Wavelength chemistry Wavelength dispersive X-rays Mechanics of Materials Steel Volume diffusion coefficients Grain boundaries Concentration maps Grain boundary |
| Popis: | Admixing pure elements to powder mixes can cause the formation of heterogeneous microstructures in sintered parts. For instance, nickel is renowned for forming nickel-rich areas (NRA) in powder metallurgy (PM) nickel steels due to its poor diffusivity in iron matrix (or lattice). The present work is aimed at characterizing the principal diffusion mechanisms of nickel and their influence on microstructures and properties of PM nickel steels. A new wavelength dispersive X-ray spectrometry (WDS) approach linking line scans and X-ray maps to concentration maps is proposed. Grain boundary and volume diffusion coefficients of admixed nickel have been determined in PM nickel steels using Suzuoka's equation. Results also show that nickel distributes itself in the iron matrix mainly by surface and grain boundary diffusion. © 2012 The Minerals, Metals & Materials Society and ASM International. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|