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Application of Thermohydrogen Processing for Formation of Ultrafine Equiaxed Grains in Near α Ti600 Alloy

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Abstract

In this article, the grain refinement of the near α Ti600 alloy by thermohydrogen processing (THP) is investigated. The THP processing includes hydrogenation, high-temperature deformation, and vacuum dehydrogenation. The microstructural evolution in each stage of THP processing was carefully investigated by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The experimental results show that face-centered-cubic (fcc) hydride (δ phase) precipitates in the hydrogenated Ti600 alloy at the hydrogen contents of 0.31 wt pct and above. The critical role of hydrides in the processing of grain refinement is clearly demonstrated. The hydrides divided the α grains in hydrogenation treatment, promoted α-phase recrystallization, and facilitated the stabilization of finer α grain size in isothermal compression.

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Acknowledgments

The authors thank the National Natural Science Foundation of China for the financial support through Grant No. 50371068 and the State Key of Laboratory of Solidification Processing in NWPU through Grant No. KP200905.

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Authors and Affiliations

  1. Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    Yong Niu (Ph.D. Candidate) & Miaoquan Li (Professor)

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  1. Yong Niu
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  2. Miaoquan Li
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Correspondence to Yong Niu.

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Manuscript submitted October 25, 2008.

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Niu, Y., Li, M. Application of Thermohydrogen Processing for Formation of Ultrafine Equiaxed Grains in Near α Ti600 Alloy. Metall Mater Trans A 40, 3009–3015 (2009). https://doi.org/10.1007/s11661-009-0002-3

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