Einfluss Von Werkstoffzustand Und Chemischer Zusammensetzung Auf Die Eigenschaften Plasmanitrierter Austenitischer Stahleinfluence Of Material Condition And Chemical Composition On The Properties Of Plasma-Nitrided Austenitic Steels

Plasma nitriding offers great potenzial for improving the wear properties of austenitic steels. Here, the austenitic standard grades 1.4307 and 1.4404, as well as the titanium-stabilized grades 1.4541 and 1.4571 were investigated regarding the influence of the material condition on the nitriding result and corrosion behavior. Special focus was put on the influence of the Ti-stabilisation. In addition, it was investigated to what extent corrosion properties are influenced by cold-forming induced defect structures. In comparison to 1.4307 and 1.4404, less nitrogen is incorporated in areas with forming martensite in titanium-stabilized austenitic steels and lower nitriding temperatures, while an increased diffusion of nitrogen is observed, when only slip bands are present. The corrosion resistance is generally improved by the plasma nitriding parameters used for this study. In general, a higher thickness of the S-phase, which forms during the plasma nitriding, results in better corrosion resistance and higher surface hardness. The titanium stabilization inhibits nitrogen diffusion in the presence of deformation induced martensite at lower nitriding temperatures and promotes diffusion in the presence of deformation induced slip bands.