Effect of rare earth on inclusions and low temperature impact properties of A572.Gr65 steel

doi:10.13251/j.issn.0254-6051.2020.11.004

Abstract

Abstract: In order to study the effect of mixed rare earth (Ce/La) with different content on the impact properties of the A572.Gr65 steel at low temperature, low temperature impact tests were conducted on A572.Gr65 steel at -40 ℃ and -60 ℃, the inclusions and fracture morphology were observed by OM and SEM combined with EDS, and the chemical composition was detected. The results show that the rare earth can significantly modify the inclusions in the A572.Gr65 steel, and the irregular-shaped Al₂O₃ and Al₂O₃-CaO inclusions are modified into spherical inclusions bearing rare earth, of which the size is reduced from 5 μm to less than 2 μm. When the rare earth content reaches 0.0057%, the impact absorbed energy of the steel at -40 ℃ increases from 317.4 J (without rare earth) to 343.6 J, which increases by 8.2%, and the impact absorbed energy at -60 ℃ increases by 13.9% from 288.0 J (without rare earth) to 328.1 J.

Key words: rare earth, inclusion, A572.Gr65 steel, low temperature impact properties

CLC Number:

TG142.1⁺2

Meng Xiaoliang, Yu Yanchong, Kang Jian, Su Cheng, Wang Shebin. Effect of rare earth on inclusions and low temperature impact properties of A572.Gr65 steel[J]. Heat Treatment of Metals, 2020, 45(11): 15-18.

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