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Concept of a new high‐strength austenitic stainless steel
Author(s) -
Shanina Bela D.,
Gavriljuk Valentin G.,
Berns Hans,
Schmalt Fabian
Publication year - 2002
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.200200181
Subject(s) - austenite , alloy , metallurgy , materials science , austenitic stainless steel , metal , martensite , crystallography , chemistry , nuclear chemistry , microstructure , corrosion
The concept of combined addition of C and N, as persued in previous work on martensitic steels, is transferred to austenitic stainless steels in order to gain highest phase stability. Thermodynamic calculations with special respect to the influence of temperature and interstitial content (C, N or C + N) were studied in the FeCrMnNC‐system. Promising compositions like Fe‐13Cr‐17Mn and Fe‐13Cr‐21Mn revealed an extended austenitic phase field. Some appropriate alloys were investigated with regard to their microscopic and electron structure. The concentration of free electrons in the austenite as the origin of phase stabilitiy increased in the order of C, N, C + N being added. Thus, the metallic character of interatomic bonding is enhanced, which entails short range atomic order. Hence, the substitutional alloy content can be minimized.