English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A Fe–3wt pctSi alloy was gas nitrided to study the effect of Si on the Fe nitride formation. Both  ε -Fe 3 N 1+ x   and  γ ′-Fe 4 N were observed at nitriding conditions only allowing to form single-phase  γ ′ layers in pure  α -Fe. During short nitriding times,  ε  and  γ ′ simultaneously grow in contact with Si-supersaturated  α -Fe(Si). Both nitrides almost invariably exhibit crystallographic orientation relationships with  α -Fe, which are indicative of a partially displacive transformation of  α -Fe being involved in the initial formation of  ε  and  γ ′. Due to Si constraining the Fe nitride growth, such transformation mechanism becomes highly important to the nitride layer formation, causing  α -Fe-grain-dependent variations in the nitride layer morphology and thickness, as well as microstructure refinement within the nitride layer. After prolonged nitriding,  α -Fe is depleted in Si due the pronounced precipitation of Si-rich nitride in  α -Fe. The growth mode of the compound layer changes, now advancing by conventional planar-type growth. During nitriding times of 1 to 48 hours,  ε  exists in contact with the NH 3 /H 2 -containing nitriding atmosphere at a nitriding potential of 1 atm −1/2  and 540 °C, only allowing for the formation of  γ ′ in pure Fe, indicating that Si affects the thermodynamic stability ranges of  ε  and  γ ′.

Fe Nitride Formation in Fe–Si Alloys: Crystallographic and Thermodynamic Aspects