Estimation of Lankford Coefficients of Austenitic and Ferritic Stainless Steels using Mean Grain Orientations from Micro-texture Measurements
- Resource Type
- Journal Article
- Authors
- David Porter; Suresh Kodukula; Timo Manninen
- Source
- ISIJ International. 2021, 61(1):401
- Subject
- Lankford coefficient
Schmid factor
austenitic stainless steels
ferritic stainless steels
mean grain orientation
orientation density function
planar anisotropy
r-value
- Language
- English
- ISSN
- 0915-1559
1347-5460
A new method to calculate the plastic anisotropy r-values of austenitic and ferritic stainless steels has been developed. The mean orientation of individual grains is obtained from SEM-EBSD data and r-values for individual grains are calculated by weighting all slip systems according to their Schmid factors. Calculated and measured r-values are in good agreement for austenitic stainless steels. However, in ferritic stainless steels, which are highly anisotropic, good agreement requires the introduction of a Schmid factor threshold below which slip systems are inactive. The present method can be used to estimate local differences in r-values in ferritic stainless steels showing the local variations in texture responsible for ridging.