Evolution mechanism of inclusions and microstructure in low-alloy cast steel with cerium addition
Year: 2024
Type: article
Abstract: Rare earth (RE) elements not only modify inclusions but also refine the steel's microstructure. This study investigates the evolution mechanism of cerium on inclusions and microstructure in low-alloy cast steel through experimental and thermodynamic analyses. After cerium is added to the steel, strip-like inclusions transform into spherical ones, accompanied by a reduction in size. The evolution path of inclusions follows MnS + MnS–Al 2 O 3 →Ce 2 O 2 S–Ce 2 S 3 –MnS + CeAlO 3 –Ce 2 S 3 –MnS with cerium addition. Notably, Ce 2 S 3 and Ce 2 O 2 S exhibit an orientation relationship, with [ 1 ‾ 22] Ce2S3 //[01 1 ‾ 1] Ce2O2S and (02 2 ‾ ) Ce2S3 //( 1 ‾ 011) Ce2O2S . Compared to Ce-free steel, the Ce-0.06 steel shows a reduced grain size and the absence of needle-shaped Widmanstätten structures, which may be mainly attributed to rare earth inclusions as heterogeneous nucleation of δ-Fe. This work can provide a theoretical basis for improving the overall mechanical properties of low-alloy cast steel by adding cerium.
Authors: Long Zhao, Ganchao Zhai, Jiadong Wu, Xiangru Chen, Qijie Zhai
Institution: Shanghai University
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,430
Awards: G2381843383, G349041337
OpenAlex ID: W4402546633