Optimising inclusion and toughening the heat-affected zone of ship plate steel with MgO nanoparticles. Issue 14 (21st September 2020)

• Record Type: Journal Article
• Authors: Yuan, Hang; Yang, Shufeng; Li, Jingshe; Guo, Hao; Liu, Wei; Wang, Tiantian
• Is Part Of: Materials science and technology. Volume 36:Issue 14(2020)
• Page Start: 1574
• Page End: 1586
• Publication Date: 2020-09-21
• Subjects: Nanoparticles -- inclusion -- microstructure -- acicular ferrite -- HAZ; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2020.1808387
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : The effect of adding MgO nanoparticles to ship plate steel at welding heat-affected zones (HAZs) was experimentally studied. The results showed that the added nanoparticles obviously optimised the inclusions; the average size of the inclusions was significantly reduced, and the distribution was relatively uniform. The toughness of the base metal and HAZ increased by 20–60 J, apart from a slight decrease in the strength of the fine-grained heat-affected zone and a nearly unchanged strength in the coarse-grained heat-affected zone, and approximately ∼2 μm (Mg–Al–Ti)O-containing inclusions induced acicular ferrite effectively, thereby simultaneously enhancing the strength and toughness of the inter-critical heat-affected zone. In conclusion, these performance improvements in both the base metal and HAZ could be attributed to grain refinement and inclusion optimisation.