Abstract
Electron backscattered diffraction (EBSD) techniques have been used to measure the plastic zones of fatigue cracks in a powder, nickel based superalloy with an average grain size of 5 μm. Two main approaches were taken: misorientation measurements and pattern quality analysis. Calculation of misorientations from EBSD orientation mapping was found to identify only a heavily deformed plastic region bordering the crack and not the entire plastic zone. This disappointing result was explained by reference to dislocation theory and which suggests that more sensitive methods of measuring the misorientations are required. By comparison the dimensions of the plastic zone measured by direct observations of the EBSD pattern quality were very close to the values predicted by elastic–plastic fracture mechanics.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
