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Metallurgical and Materials Transactions B

, Volume 50, Issue 5, pp 2284–2295 | Cite as

Sulfide Transformation with Tellurium Treatment for Y15 Free-Cutting Steel

  • Shuo Zhang
  • Feng Wang
  • Shufeng YangEmail author
  • Jianhua Liu
  • Jingshe Li
Article
  • 116 Downloads

Abstract

To investigate the effect of tellurium on the morphology of sulfide, various amounts of tellurium powders were added to the Y15 free-cutting commercial steel melt and then the melt was cooled in different cooling modes. The composition and morphology of sulfide and telluride in steel were analyzed to investigate the mechanism of MnS transformation combined with in situ observation. The results showed that the precipitation of chain-like MnS inclusions was significantly inhibited due to the addition of tellurium, and these MnS inclusions were transformed into complex inclusions with lower aspect ratios, which were composed of MnS and MnTe. In air-cooling mode, the MnS inclusions were effectively spheroidized when the w([Te])/w([S]) in steel was 0.2, whereas tellurium had almost no effect on the morphology of sulfide in furnace-cooling mode. The mechanism of sulfide spheroidization is discussed. The mechanism was verified by in situ observation experiment through high-temperature laser confocal microscopy.

Notes

Acknowledgment

This research is supported by the National Science Foundation of China (Nos. 51574190 and 51574020).

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Copyright information

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

Authors and Affiliations

  • Shuo Zhang
    • 1
  • Feng Wang
    • 1
  • Shufeng Yang
    • 2
    Email author
  • Jianhua Liu
    • 1
  • Jingshe Li
    • 2
  1. 1.Institute of Engineering TechnologyUniversity of Science and Technology BeijingBeijingChina
  2. 2.School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijingChina

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