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Metallurgical and Materials Transactions B

, Volume 48, Issue 1, pp 146–161 | Cite as

Simultaneous Modification of Alumina and MgO·Al2O3 Inclusions by Calcium Treatment During Electroslag Remelting of Stainless Tool Steel

  • Cheng-Bin ShiEmail author
  • Wen-Tao Yu
  • Hao Wang
  • Jing Li
  • Min Jiang
Article

Abstract

Calcium modification of both alumina and MgO·Al2O3 inclusions during protective gas electroslag remelting (P-ESR) of 8Cr17MoV stainless steel and its effect on nitrides and primary carbides were studied by analyzing the transient evolution of oxide and sulfide inclusions in the P-ESR process. The oxide inclusions that were not removed during P-ESR without calcium treatment were found to retain their original state until in as-cast ingot. Calcium treatment modified all MgO·Al2O3 and alumina inclusions that had not been removed in the P-ESR process to liquid/partially liquid CaO-Al2O3-(MgO) with uniformly distributed elements, in addition to a small proportion of partially modified inclusions of a CaO-MgO-Al2O3 core surrounded by a liquid CaO-Al2O3. The modification of low-MgO-containing MgO·Al2O3 inclusions involves the preferential reduction of MgO from the MgO·Al2O3 inclusion by calcium and the reaction of calcium with Al2O3 in the inclusion. It is the incomplete/complete reduction of MgO from the spinel by calcium that contributes to the modification of spinels. Alumina inclusions were liquefied by direct reaction with calcium. Calcium treatment during P-ESR refining also provided an effective approach to prevent the formation of nitrides and primary carbides in stainless steel through modifying their preferred nucleation sites (alumina and MgO·Al2O3 inclusions) to calcium aluminates, which made no contribution to improving the steel cleanliness.

Keywords

Liquid Steel Inductively Couple Plasma Atomic Emission Spectroscopy Calcium Aluminate Oxide Inclusion Sulfide Inclusion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The author (C.B. SHI) is grateful to Professor Jung-wook Cho, Pohang University of Science and Technology, for his fruitful discussions. Thanks are also extended to Senior Researcher Guangqi Lv and all other personnel of Zhejiang Zhengda Mould Corp., LTD, for their scientific input in the experimental operations. The financial support by the National Natural Science Foundation of China (Grant Nos. 51504019 and 51444004) and China Postdoctoral Science Foundation (2016T90035) is also greatly acknowledged.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2016

Authors and Affiliations

  • Cheng-Bin Shi
    • 1
    Email author
  • Wen-Tao Yu
    • 1
  • Hao Wang
    • 1
  • Jing Li
    • 1
  • Min Jiang
    • 1
  1. 1.State Key Laboratory of Advanced MetallurgyUniversity of Science and Technology Beijing (USTB)BeijingP.R. China

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