Leijun Li, Kopparthi Ravikiran, Nitin Kumar Sharma, Suvan Dev Choudhury, Rangasayee Kannan, Michael J. Gaudet, Neil Anderson
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引用次数: 0
Abstract
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.
研究了焊后热处理（PWHT）的峰值温度对电阻焊（ERW）X70 级管线钢焊缝中富铌碳氮化物（Nb(C,N)）溶解的影响。选区电子衍射图和相应的电子能量损失谱图显示，在热处理至 1080 °C 峰值温度的样品中，既有富 Nb 的碳氮化物，也有富 Ti 的氮化物 (Ti,Nb)N。然而，在加热至 1220 °C 峰值温度的样品中，只发现了富钛氮化物。在持续加热到高于 Ac3 温度（即接近 1100 °C）的过程中，Nb(C,N)的溶解表现为扩张和扩张的衍生物。这一实验结果与 DICTRA 模型的预测结果一致。此外，还建立了一个现象学模型来解释 Nb（C，N）沉淀溶解过程中的体积收缩。
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