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Weak Beam TEM Study on Stacking Fault Energy of High Nitrogen Steels
Author(s) -
Ojima M.,
Adachi Y.,
Tomota Y.,
Katada Y.,
Kaneko Y.,
Kuroda K.,
Saka H.
Publication year - 2009
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.2374/sri09sp038
Subject(s) - nitrogen , materials science , stacking fault energy , dislocation , stacking fault , austenite , hardening (computing) , metallurgy , work hardening , chemical mechanical planarization , austenitic stainless steel , crystallography , composite material , microstructure , chemistry , corrosion , polishing , layer (electronics) , organic chemistry
Abstract The nature of the high work‐hardening rate of nitrogen bearing steels was examined focusing on the stacking fault energy (SFE). The dislocation configuration and the width of dissociated dislocations were evaluated in various kinds of austenitic stainless steels with and without nitrogen, using the weak beam method. Nitrogen addition resulted in changing the dislocation configuration from tangled to planar. Nitrogen was, however, found to increase the SFE rather than decrease as reported previously and the SFE can be formulated as a function of chemical composition, SFE(mJ/m 2 ) = 5.53 ‐ 0.16 (wt%Cr) + 1.40 (wt%Ni) + 17.10 (wt%%N). These results indicate that dislocation planarization by nitrogen addition is inadequately explained in terms of SFE.