Abstract
Preparation and Performance of Nitrogen-containing Stainless Steel
Highlights
As was reported that the hardness and strength of austenitic stainless steel can be significantly improved with the addition nitrogen and the corrosion resistance can be further enhanced as well [1,2,3,4]
It clearly illustrates that only typical peaks corresponding to γ phase exist for untreated sample, and the phase compositions are consisted of ε-Fe2,3N, γ′-Fe4N and CrN for plasma nitriding (PN) sample, while only typical peaks corresponding to γN phase exist for PN+SS sample
It can be concluded that the nitrides formed during PN process are decomposed by the subsequent solid solution treatment
Summary
As was reported that the hardness and strength of austenitic stainless steel can be significantly improved with the addition nitrogen and the corrosion resistance can be further enhanced as well [1,2,3,4]. The existed methods to produce nitrogen-containing austenitic steel include high pressure melting and high temperature gas nitriding etc. Plasma nitriding of austenitic stainless steel is usually accompanied with the precipitation of chromium nitrides, which brings out the deterioration of the corrosion resistance due to the depletion of the chromium content in the matrix. Though a single S-phase without chromium nitrides precipitation in the nitriding layer can be formed at temperatures lower than 450 °C, the rate of plasma nitriding process is very slow at this low temperature, leading to very long duration for getting deep nitriding layer, which results
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