Dissolution of Nb(C,N) During Post-weld Heat-Treatment of Electric Resistance Welded X70 Line Pipe

The effect of peak temperature for post-weld heat treatment (PWHT) on the dissolution of Nb-rich carbonitrides, Nb(C,N), in the weldline of an electric resistance welded (ERW) X70 grade pipeline steel was investigated. Selected-area electron diffraction patterns and corresponding electron energy los...

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Veröffentlicht in:	Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2024-09, Vol.55 (9), p.3351-3363
Hauptverfasser:	Li, Leijun, Ravikiran, Kopparthi, Sharma, Nitin Kumar, Choudhury, Suvan Dev, Kannan, Rangasayee, Gaudet, Michael J., Anderson, Neil
Format:	Artikel
Sprache:	eng
Schlagworte:	Characterization and Evaluation of Materials Chemistry and Materials Science Cooling Diffraction patterns dilatometry Dissolution Electrical resistance Electron diffraction Electron energy loss spectroscopy Grain growth Heat treating heat-treatment Investigations MATERIALS SCIENCE Metallic Materials Microscopy Microstructure Nanotechnology Nb(C,N) Niobium carbonitride Original Research Article Post-weld heat treatment Precipitates R&D Research & development Spectrum analysis Steel pipes Structural Materials Structural steels Surfaces and Interfaces Temperature Thin Films welding
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Zusammenfassung:	The effect of peak temperature for post-weld heat treatment (PWHT) on the dissolution of Nb-rich carbonitrides, Nb(C,N), in the weldline of an electric resistance welded (ERW) X70 grade pipeline steel was investigated. Selected-area electron diffraction patterns and corresponding electron energy loss spectroscopy mappings revealed both Nb-rich carbonitrides and Ti-rich nitrides, (Ti,Nb)N, in the sample heat-treated to 1080 °C peak temperature. However, only Ti-rich nitrides were revealed in the sample heat-treated to 1220 °C peak temperature. During continuous heating to higher than the Ac3 temperature, i.e ., near 1100 °C temperature, the dissolution of Nb(C,N) was observed in dilation and derivative of dilation. This experimental result agreed with the predictions by a DICTRA model. Furthermore, a phenomenological model was developed to explain the volume shrinkage during the dissolution of Nb(C,N) precipitates.
ISSN:	1073-5623 1543-1940
DOI:	10.1007/s11661-024-07496-4