Investigation of characteristic and evolution of fine-grained bainitic microstructure in the coarse-grained heat-affected zone of super-high strength steel for offshore structure

Xiaolong Gan, Xiangliang Wan, Yongjie Zhang, Honghong Wang, Guangqiang Li, Guang Xu, Kaiming Wu

研究成果: Article査読

3 被引用数 (Scopus)

抄録

E690 steel is a novel developed super-high strength steel for offshore structure. The microstructure-property relationship in the coarse-grained heat-affected zone of E690 steel subjected to high heat input welding with rapid cooling are studied, and the evolution of fine-grained bainitic microstructure is in-situly and crystallographically characterized. The results reveal that the fine-grained bainitic microstructure with abundant high angle grain boundaries is obtained in the coarse-grained heat-affected zone, attributing to rapid cooling. The formation of fine-grained bainite is attributed to extensive impingements and intersections of bainite sheaves forming via both primary nucleation and sympathetic nucleation. Abundant of high angle grain boundaries exist between the sheaves of bainite. The fine-grained bainitic microstructure with abundant of high angle grain boundaries in the coarse-grained heat-affected zone of this super-high strength steel contributes to excellent low temperature impact toughness.

本文言語English
論文番号109893
ジャーナルMaterials Characterization
157
DOI
出版ステータスPublished - 2019 11

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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