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The effects of adding different mass fractions of rare earth La on the inclusions, microstructure, and mechanical properties of 2.0 GPa ultra-high strength steel, which was smelted by a vacuum induction furnace, have been investigated by means of a metallographic microscope, scanning electron microscope, EBSD analysis, XRD diffraction, and tensile and impact tests. The results reveal that as the mass fraction of La increases from 0(no addition) to 0.003 2% and then further to 0.022% in the steel, inclusions evolve from MgO·Al_2O3 to LaAlO3-La_2O_2S complex, and later to rare earth composite oxysulfides LaS-La_2O_2S. The volume fraction of retained austenite after aging is from 1.85% to 3.05% and then to 5.17%, with the improvement rates of 64.9% and 69.5%, respectively. The Charpy impact energy increases from 11.9 J to 14.1 J and then to 15.3 J, with the improvement rates of 18.5% and 8.5%, respectively. Rare earth La plays a key role in modifying and spheroidizing inclusions in the steel, and increases the volume fraction of retained austenite, leading to a significant increase in impact energy. However, when La is excessively added to a mass fraction of 0.022%, the yield strength of the steel decreases from 1.596 GPa to 1.476 GPa, with a decrease of 0.120 GPa. It is concluded that the optimal addition of rare earth La is 0.003 2%, in this case, contributing to a noticeable increase in the toughness of 2.0 GPa ultra-high strength steel.
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Basic Information:
DOI：10.14186/j.cnki.1671-6620.2026.01.002
China Classification Code:TF741.7
Citation Information:
[1]Zhang Yunfei,Zhan Dongping,Li Jihang ,et al.Influence of rare earth lanthanum addition on inclusions and mechanical properties of 2.0 GPa ultra-high strength steel[J].Journal of Materials and Metallurgy,2026,25(01):12-19.DOI:10.14186/j.cnki.1671-6620.2026.01.002.
Fund Information:
山西省吕梁市校地合作重点研发专项项目(2023XDHZ05); 黑龙江省揭榜挂帅科技攻关项目(2022ZXJ03A02)