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The influence of nitrogen and orientation on the rolling deformation mechanisms of austenitic single crystals
Author(s) -
Akdut Nuri,
Keichel Jörg,
Foct Jacques
Publication year - 1997
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199701175
Subject(s) - slip (aerodynamics) , nitrogen , materials science , austenite , planarity testing , planar , crystallography , austenitic stainless steel , single crystal , crystal twinning , metallurgy , deformation (meteorology) , homogeneous , deformation bands , composite material , thermodynamics , chemistry , microstructure , corrosion , physics , computer graphics (images) , organic chemistry , computer science
The effect of nitrogen content and initial orientation on the deformation mechanisms of austenitic single crystals was investigated. From a nitrogen alloyed and a nitrogen free single crystal two initial orientations were cut out and cold rolled up to 90% thickness reduction, the corresponding {111} pole figures were measured and the slip traces were analyzed from the longitudinal section. In one of the nitrogen alloyed austenitic single crystals massive microcrack formation was observed. This observation was discussed in terms of the planarity of slip caused by the interstitially solved alloying element nitrogen. Nitrogen has a strong affinity to dislocations and thus alters the slip character from homogeneous to planar and the slip distribution from single slip to coarse slip. The present investigation proves that the coarse planar slip caused by the alloying element nitrogen in dependency of the initial orientation is responsible for the observed crack formation during rolling. The planarity of slip is also reflected in the measured pole figures. The {111} poles of the nitrogen alloyed single crystals show less scattering and higher maximum intensities than the poles of the nitrogen free single crystals. The differences were attributed to the influence of the nitrogen content on deformation mechanisms.