Effect of yttrium-based rare earth on inclusions and cryogenic temperature  impact property of high strength shipbuilding steel

doi:10.13251/j.issn.0254-6051.2022.03.027

Abstract

Abstract: Effect of yttrium-based rare earth content on inclusions and cryogenic temperature impact property of the EH36 high strength shipbuilding steel was studied by means of scanning electron microscope and energy dispersive spectroscopy. The results show that the addition of proper amount of rare earth can significantly improve the low temperature impact property of the EH36 steel. When the rare earth content in the steel is 0.018%(mass fraction), the transverse impact property at -40 ℃ and -60 ℃ are increased by 59.4% and 65.7%, respectively. After the rare earth is added, the low temperature impact fracture morphology changes from the cleavage type without rare earth to the dimple fracture, and the small spherical rare earth composite inclusions at the bottom of the dimple buffers and hinders the crack growth. Meanwhile, the rare earth can modify long strip-like Al₂O₃-CaO-MnS inclusions in the EH36 steel into fine spherical rare earth inclusions, and the particle size of inclusions is refined from about 5 μm to less than 3 μm.

Key words: high strength shipbuilding steel, yttrium-based rare earth, inclusion, cryogenic temperature impact property

CLC Number:

TG142.1⁺2

Luo Diqiang, Yu Yinhong, Zhang Zhenming, Feng Xiaoming, Liu Min, Lai Chaobin. Effect of yttrium-based rare earth on inclusions and cryogenic temperature impact property of high strength shipbuilding steel[J]. Heat Treatment of Metals, 2022, 47(3): 142-146.

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Effect of yttrium-based rare earth on inclusions and cryogenic temperature impact property of high strength shipbuilding steel

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