Development of high impact toughness offshore engineering steel by yttrium-based rare earth addition. (26th November 2021)

• Record Type: Journal Article
• Authors: Luo, Diqiang; Yu, Yinhong; Zhang, Zhenming; Sun, Lefei; Feng, Xiaoming; Lai, Chaobin
• Is Part Of: Ironmaking & steelmaking. Volume 48:Number 10(2021)
• Page Start: 1247
• Page End: 1253
• Publication Date: 2021-11-26
• Subjects: Offshore engineering steel -- EH36 steel -- yttrium-based rare earth -- inclusions -- impact toughness -- grain size; Iron industry and trade -- Periodicals; Steel industry and trade -- Periodicals; 669.1
• DOI: 10.1080/03019233.2021.1996181
• Languages: English
• ISSNs: 0301-9233

Abstract

ABSTRACT: The effect of yttrium-based rare earth on the inclusions and impact toughness of EH36 offshore engineering steel were investigated by scanning electron microscopy, electron backscattered diffraction and electron probe x-ray microanalysis techniques. It was found that impact toughness and isotropy of EH36 were enhanced significantly by rare earth addition. The longitudinal and transverse impact toughness at −60°C were increased by 33.5% and 113.7%, respectively. Moreover, the differences between the longitudinal and transverse textures decrease significantly with the addition of rare earth, the low-temperature impact property isotropy increased by 61.1%. Meanwhile, rare earth can modify elongated irregular MnS inclusions into small spherical regular RE-inclusions. Most of the RE-inclusions are within 3μm in diameter, which account for 97.84% of total inclusions. With the addition of rare earth in EH36 offshore engineering steel, the average effective grain size was reduced by 9.7%.