Impact of short-range ordering on yield strength of high manganese austenitic steels

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 614; pp. 122 - 128
• Main Authors: Kang, Jee-Hyun, Ingendahl, Tobias, von Appen, Jörg, Dronskowski, Richard, Bleck, Wolfgang
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 22.09.2014; Elsevier
• Subjects: Austenite; Austenitic stainless steels; Composition effects; Condensed matter: structure, mechanical and thermal properties; Elasticity, elastic constants; Exact sciences and technology; Manganese; Mathematical models; Mechanical and acoustical properties of condensed matter; Mechanical characterisation; Mechanical properties of solids; Order disorder; Physics; Short-range ordering; Steels; Stresses; Structural steels; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Yield strength; Yield strength; Short-range ordering; Steels; Mechanical characterisation; Austenite; Temperature dependence; Dislocation glide; Manganese steels; Experimental result; Temperature effects; Yield point; Austenitic steels; Stress effects; Short-range order; Ab initio calculations
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2014.07.016

A model is suggested to quantitatively predict the compositional and temperature effects on the yield strength of high manganese austenitic steels. In the model, short-range ordering is considered to be an effective obstacle against the dislocation glide at the yield point, and the required stress to destroy the short-range ordering was calculated by employing the reported cell model as well as ab initio calculations. The obtained stress depends on both composition and temperature and is systematically related to the yield strength. The model is successfully validated with a number of experimental results and can be employed to tailor the yield strength of the high Mn austenitic steels.