Abstract

The morphology and orientation relationship between carbide precipitated at grain boundary and both side matrixes in nickel base alloy 690 aged at 715℃for 2—200 h after solution treated were investigated by HRTEM,SEM and EBSD.The results show that the boundary carbide is easy to nucleate in the grain with high indexed crystal plane parallel to boundary,and the carbide has coherent orientation relationship(COR) with this grain.The carbide grows preferentially into the grain without COR between carbide and grain,which leads to lower chromium concentration in this side matrix near boundary.The asymmetry of chromium concentration profile leads to the different corrosion resistance of the two side grains nearby the grain boundary.

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 call

Disclaimer: 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.