التفاصيل البيبلوغرافية
| العنوان: |
Dissolution of Nb(C,N) During Post-weld Heat-Treatment of Electric Resistance Welded X70 Line Pipe. |
| المؤلفون: |
Li, Leijun, Ravikiran, Kopparthi, Sharma, Nitin Kumar, Choudhury, Suvan Dev, Kannan, Rangasayee, Gaudet, Michael J., Anderson, Neil |
| المصدر: |
Metallurgical & Materials Transactions. Part A; Sep2024, Vol. 55 Issue 9, p3351-3363, 13p |
| مصطلحات موضوعية: |
ELECTRON energy loss spectroscopy, ELECTRIC welding, RESISTANCE welding, ELECTRIC resistance, HEAT treatment |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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