The Evolution and Distribution of Microstructures in High-Energy Laser-Welded X100 Pipeline Steel
| Autor: | Zongxiang Yao, Jiang Shan, Gang Wang, Zhongwen Zhang, Yin Limeng, Jinzhao Wang, Cunguo Zuo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Toughness
Materials science Scanning electron microscope grain orientation 02 engineering and technology Welding X100 pipeline steel lcsh:Technology 01 natural sciences Article law.invention Optical microscope law 0103 physical sciences CSL General Materials Science Composite material lcsh:Microscopy lcsh:QC120-168.85 010302 applied physics lcsh:QH201-278.5 lcsh:T Laser beam welding 021001 nanoscience & nanotechnology Microstructure lcsh:TA1-2040 laser welding lcsh:Descriptive and experimental mechanics Grain boundary lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology lcsh:TK1-9971 recrystallization texture Electron backscatter diffraction |
| Zdroj: | Materials Volume 12 Issue 11 Materials, Vol 12, Iss 11, p 1762 (2019) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma12111762 |
| Popis: | High-energy beam welding was introduced for pipeline steel welding to reduce pipeline construction costs and improve the efficiency and safety of oil and gas transportation. Microstructures and their distribution in X100 laser-welded joints, which determine the joints&rsquo strength and toughness, are discussed in this paper. Welded joints were prepared by an automatic 10,000-watt robot-based disc laser-welding platform for 12.8 mm thick X100 pipeline steel. Then, the grain, grain boundary, orientation, and distribution pattern of each zone of the welded joints were studied by optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and electron backscattered diffraction (EBSD) analysis techniques. The results showed that the grain boundary density, contents of the high-angle and low-angle grain boundaries, distribution states, and evolution trends of coincident site lattice (CSL) grain boundaries were essentially the same in each zone from the base metal (BM) to the weld of the X100 pipeline steel laser-welded joint. The relative content of grain boundaries above 55° which were composed of the &Sigma 3 type CSL grain boundary, showed a considerable impact on the mechanical properties of the joint. The content of twin grain boundaries was closely related to the thermal cycles of laser welding, and the effect of the cooling rate was greater than that of the process of austenization. |
| Databáze: | OpenAIRE |
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