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

Li, Leijun; Ravikiran, Kopparthi; Sharma, Nitin Kumar; Choudhury, Suvan Dev; Kannan, Rangasayee; Gaudet, Michael J.; Anderson, Neil

doi:10.1007/s11661-024-07496-4

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

Journal Article · Wed Jun 26 04:00:00 EDT 2024 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-024-07496-4· OSTI ID:2378089

Li, Leijun ^[1]; Ravikiran, Kopparthi ^[1]; Sharma, Nitin Kumar ^[2]; Choudhury, Suvan Dev ^[1]; ^[3]; Gaudet, Michael J. ^[4]; Anderson, Neil ^[5]

Univ. of Alberta, Edmonton, AB (Canada)
Indian Inst. of Technology (IIT), Jodhpur (India)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
EVRAZ North America, Regina, SK (Canada)
Oak Forensic Engineering Ltd., Calgary, AB (Canada)

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. Notably, 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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2378089

Journal Information:: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Vol. 55; ISSN 1073-5623

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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