Journal
MATERIALS LETTERS
Volume 304, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2021.130603
Keywords
Welding; Metals and alloys; Metal forming and shaping
Funding
- National Natural Science Foundation of China [51775102, 51975391]
- Qinglan Project of Jiangsu Province
- Open Research Fund from the State Key Laboratory of Rolling and Automation, Northeastern University [2016005]
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The study focuses on the acicular ferrite nucleation mechanism in laser-MAG hybrid welding of X100 pipeline steel. Experimental results show that inclusions mainly composed of Ti2O3 and Al2O3 induce the nucleation of acicular ferrite. A Mn-depleted zone (MDZ) near the inclusions plays a significant role in the nucleation process, requiring inclusions with a high mole fraction of Ti2O3 for its formation.
Acicular ferrite nucleation mechanism in laser-MAG hybrid welding of X100 pipeline steel is studied in this paper. The experimental results show that the inclusions are mainly composed of Ti2O3 and Al2O3 in the weld, which induce the nucleation of acicular ferrite. There is Mn-depleted zone (MDZ) near the inclusions. Therefore, MDZ mechanism is responsible for the acicular ferrite nucleation in the laser-MAG hybrid weld of X100 pipeline steel. In addition, inclusions should contain a high mole fraction of Ti2O3 in order to form MDZ and consequentially induce acicular ferrite nucleation.
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