Secondary Precipitation Behavior of Nitride in the Electro-slag Remelted Structure of Alloy 690

The precipitation and evolution of secondary nitrides （S-nitrides） in the Alloy 690 electro-slag remelted （ESR） structure were investigated. Experimental results indicate that S-nitrides precipitated in the interdendritic region of the ESR structure at temperatures higher than 1100 ℃. S-nitrides cou...

Full description

Saved in:
Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2017-08, Vol.30 (8), p.771-780
Main Authors: Wang, Min, Chen, Bo, Hao, Xian-Chao, Ma, Ying-Che, Liu, Kui
Format: Article
Language:English
Subjects:
Alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Corrosion resistance
Evolution
Grain boundaries
Materials Science
Metallic Materials
Nanotechnology
Nickel base alloys
Nitrides
Organometallic Chemistry
Scanning electron microscopy
Slag
Spectroscopy/Spectrometry
Statistical analysis
Superalloys
Titanium
Tribology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The precipitation and evolution of secondary nitrides （S-nitrides） in the Alloy 690 electro-slag remelted （ESR） structure were investigated. Experimental results indicate that S-nitrides precipitated in the interdendritic region of the ESR structure at temperatures higher than 1100 ℃. S-nitrides could spread throughout the entire interdendritic area after sufficient exposure, and they were more numerous and much finer than primary nitrides. Furthermore, after studying the evolution of S-nitride particles at 1100, 1200 and 1300℃, it was determined that the precipitation of S-nitrides was controlled by the diffusion of nitrogen. In addition, by investigating the elemental segregation of ESR structure and calculating critical Ti concentrations, S-nitride precipitation was found to be thermodynamically inevitable in the Alloy 690 ESR structure.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-017-0541-3