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| Application of EBSD technology on microstructure
characterization of X80 grith welding heat affected zone |
| ZHAO Gang |
| Construction Project Management Branch of China National Petroleum Pipeline
Network Group Co., Ltd., Langfang 065000, China |
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| Guide |
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Abstract The optical microscopy (OM), scanning electron microscopy (SEM) and electron back-scattered diffraction (EBSD) technology were used to systematically characterized and contrastively analyzed the size, distribution, morphology and crystallographic characteristics of the M/A constituent microstructure in the intercritical coarse grain zone of X80 grith heat affected zone. The results showed that the M/A constituent was distributed along the parent austenite grain boundary in the form of island chain in the intercritical coarse grain zone of X80 grith heat affected zone. The island chain M/A constituent was surrounded by the high angle grain boundary, and a stress field generated around it. The OM and SEM could only present the size, distribution and morphology of this M/A constituent in matrix. In contrast, the use of the grain boundary map and band slope map of EBSD could further characterize the interface information and stress field distribution of this island-type M/A constituent. Moreover, compared with the inverse pole figure map and band contrast map of EBSD, the band slope map was more suitable for the characterization of the M/A island chain structure distributed along grain boundaries.
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Received: 10 February 2022
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2022, Vol. 40 
