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Inclusion Characterization and Formation Mechanisms in Spring Steel Deoxidized by Silicon

  • Sha LyuEmail author
  • Xiaodong Ma
  • Zongze Huang
  • Zan Yao
  • Hae-Geon Lee
  • Zhouhua Jiang
  • Geoff Wang
  • Jin Zou
  • Baojun Zhao
Article
  • 95 Downloads

Abstract

To elucidate the mechanism of formation of inclusions in microalloyed spring steel deoxidized by Si, their number, morphology, and chemical compositions were analyzed by electron probe X-ray microanalysis. Wavelength-dispersive spectrometry and Monte Carlo simulation were used to confirm the existence of inherent FeO in the inclusions. Additions of Nb and V did not have an observable influence on the formation of inclusions. Based on the major chemical compositions, the inclusions in spring steel were classified into four types: CaO-SiO2, Al2O3-SiO2, Al2O3-SiO2-CaO, and MnS. Most CaO-SiO2 inclusions were around 10 μm in diameter, with their composition close to that of the refining slag and liquidus temperatures all below 1400 °C. The Al2O3-SiO2 inclusions were mainly attributed to deoxidization products. They were usually multiphased with liquidus temperatures higher than 1500 °C and smaller than 10 μm in diameter. Most Al2O3-SiO2-CaO inclusions with high Al2O3 and SiO2 contents originated from the coalescence of CaO-SiO2 and Al2O3-SiO2 inclusions; those with high CaO and SiO2 contents were considered to form via reduction of CaO-SiO2 inclusions by Al dissolved in the steel.

Notes

Acknowledgments

This work was supported by the Australian Research Council and Baosteel Australia Research and Development Centre. The University of Queensland International Research Tuition Award and China Scholarship Council provided scholarships for Mr Sha Lyu. The Australian Microscopy & Microanalysis Research Facility is thanked for providing characterization facilities. Technical supports for the EPMA facility from Mr. Ron Rasch and Ms. Ying Yu of the Centre for Microscopy and Microanalysis at the University of Queensland are gratefully acknowledged. We thank Kathryn Sole, PhD, from Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  • Sha Lyu
    • 1
    Email author
  • Xiaodong Ma
    • 1
  • Zongze Huang
    • 2
  • Zan Yao
    • 2
  • Hae-Geon Lee
    • 1
  • Zhouhua Jiang
    • 3
  • Geoff Wang
    • 1
  • Jin Zou
    • 1
  • Baojun Zhao
    • 1
  1. 1.University of QueenslandBrisbaneAustralia
  2. 2.Baoshan Iron and Steel Co. LtdShanghaiChina
  3. 3.Northeastern UniversityShenyangChina

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