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Refining As-cast β-Ti Grains Through ZrN Inoculation

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Abstract

The columnar-to-equiaxed transition and remarkable refinement of β-Ti grains occur in an as-cast Ti-13Mo alloy when a new grain refiner, ZrN, was inoculated at a nitrogen level as low as 0.4 wt pct. The grain refining effect is attributed to in situ-formed TiN particles that provide active nucleation sites and solute Zr that promotes constitutional supercooling. Reproducible orientation relationships were identified between TiN nucleants and β-Ti matrix, and well explained by the edge-to-edge matching model.

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The authors wish to acknowledge the Australian Research Council (ARC) for the financial support (DP160100560). The authors are indebted to Dr Daniel East and Dr Arvind Prasad for the sample preparation of ZrN-inoculated Ti button ingots. The authors would also like to acknowledge the technical assistance of the RMIT Microscope and Microanalysis Facility, RMIT University.

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Authors and Affiliations

  1. School of Engineering, RMIT University, Carlton, VIC, Australia

    Dong Qiu, Duyao Zhang, Mark A. Easton & Mark A. Gibson

  2. School of Mechanical and Mining Engineering, University of Queensland, St Lucia, QLD, Australia

    David H. St John

  3. CSIRO Manufacturing, Clayton, VIC, Australia

    Mark A. Gibson

Authors
  1. Dong Qiu
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  2. Duyao Zhang
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  3. Mark A. Easton
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  4. David H. St John
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  5. Mark A. Gibson
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Corresponding author

Correspondence to Dong Qiu.

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Manuscript submitted November 27, 2017.

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Qiu, D., Zhang, D., Easton, M.A. et al. Refining As-cast β-Ti Grains Through ZrN Inoculation. Metall Mater Trans A 49, 1444–1449 (2018). https://doi.org/10.1007/s11661-018-4531-5

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