Interfacial reaction between oxide inclusion and steel matrix deoxidized by Si and Mn at 1473 K

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Abstract

An improved diffusion couple method was used to simulate the dynamic process of the solid-state reaction at the interface between oxide inclusions and a steel matrix deoxidized by Si and Mn during heat treatment at 1473 K. Experimental results indicated that good contact between the oxide and steel matrix was attained after pre-treatment at 1673 K. In addition, the reaction between the oxide and steel matrix at 1673 K was suppressed, and the effect of this reaction on the diffusion couple experiments at 1473 K was minimized. In the diffusion couple experiments, the diffusion of oxygen from the oxide to the steel matrix resulted in the precipitation of fine oxide particles and a decrease in the Mn content in the steel matrix near the interface after heat treatment at 1473 K. With increasing heat treatment time, the widths of the particle precipitation zone (PPZ) and Mn-depleted zone (MDZ) gradually increased. In addition, the solid-state reaction at the interface between the oxide and steel matrix was intense, and the widths of the PPZ and MDZ increased rapidly during the 0–20 h stage of heat treatment, especially during the 0–5 h stage. The interfacial reaction was retarded, and the rates of width expansion of PPZ and MDZ decreased with increasing heat treatment time.

Keywords

Oxide inclusion Diffusion couple Heat treatment Solid-state reaction Interfacial reaction 

Notes

Acknowledgements

The authors are grateful to the financial support from the National Natural Science Foundation of China (Nos. 51574020, 51674023, and 51604201).

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Copyright information

© China Iron and Steel Research Institute Group 2018

Authors and Affiliations

  1. 1.School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.Beijing Key Laboratory of Special Melting and Preparation of High-End MetalsBeijingChina
  3. 3.The State Key Laboratory of Refractories and MetallurgyWuhan University of Science and TechnologyWuhanChina

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