Investigation on the Origin of Al 2 O 3 ‐Rich Inclusions in Valve Spring Steel under Vacuum Condition | Zendy

Chen Liangjun | Zendy; Chen Weiqing | Zendy; Hu Yang | Zendy; Chen Zhaoping | Zendy; Xu Yingtie | Zendy; Yan Wei | Zendy

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Investigation on the Origin of Al 2 O 3 ‐Rich Inclusions in Valve Spring Steel under Vacuum Condition

Author(s) -

Chen Liangjun,

Chen Weiqing,

Hu Yang,

Chen Zhaoping,

Xu Yingtie,

Yan Wei

Publication year - 2017

Publication title -

steel research international

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.603

H-Index - 49

eISSN - 1869-344X

pISSN - 1611-3683

DOI - 10.1002/srin.201600376

Subject(s) - materials science , metallurgy , spring steel , crucible (geodemography) , slag (welding) , refractory (planetary science) , levitation , spring (device) , liquid steel , thermodynamics , chemistry , mechanical engineering , engineering , computational chemistry , physics , magnet

Hard and non‐deformable Al 2 O 3 ‐rich (>70 mass%) inclusions are extremely detrimental for valve spring wire. In order to explore the origin of Al 2 O 3 ‐rich inclusions and provide solutions, an investigation on the effects of Al‐containing MgO–C refractory and refining slag on the generation of Al 2 O 3 ‐rich inclusions in valve spring steel deoxidized by Si and Mn under different vacuum conditions is carried out on a laboratorial scale by a cold crucible levitation melting (CCLM) furnace. The experimental results indicate that the refractory/steel interaction under vacuum conditions has a far more significant contribution to the increase of [Al] S (Acid‐soluble Al) content in steel compared with slag/steel interaction, which further leads to the generation of Al 2 O 3 ‐rich inclusions. Based on the experimental results and thermodynamic calculations, the mechanisms of refractory/steel interaction and slag/steel interaction under vacuum conditions are deduced to provide a reference for the control of Al 2 O 3 ‐rich inclusions in valve spring steel deoxidized by Si and Mn.

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