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Mechanism of Martensitic to Equiaxed Microstructure Evolution during Hot Deformation of a Near-Alpha Ti Alloy

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Abstract

In this study, mechanisms of microstructural evolution during hot deformation of Ti-1100 were investigated by EBSD analysis. Misorientation angle distribution of initial microstructure showed that diffusionless martensitic phase transformation in Ti-1100 obeys Burgers orientation relationship, and most of the high-angle-grain boundaries consist of angles of 60 and 63 deg. Calculated activation energy of hot deformation (~338 kJ/mol) and EBSD grain boundary maps revealed that continuous dynamic recrystallization (CDRX) is the dominant mechanism during hot compression at 1073 K (800 °C) and strain rate of 0.005 s−1. At a temperature range of 1073 K to 1173 K (800 °C to 900 °C), not only the array of variants lying perpendicular to compression axis but also CDRX contributes to flow softening. Increasing the rolling temperature from 1123 K to 1273 K (850 °C to 1000 °C) brought about changes in spheroidization mechanism from CDRX to conventional boundary splitting and termination migration correlated with the higher volume fraction of beta phase at higher temperatures.

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Acknowledgments

The work has been based on a project proposed by the School of Metallurgy and Materials Engineering of the Iran University of Science and Technology as the Ph.D. thesis of Seyed Amir Arsalan Shams, who was granted permission to perform his experiments at the facilities and under co-supervision of Professor Chong Soo Lee at the Graduate Institute of Ferrous Technology (GIFT), POSTECH, Republic of Korea.

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Authors and Affiliations

  1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, 16846-13114, Iran

    Seyed Amir Arsalan Shams & Shamsoddin Mirdamadi

  2. Metallic Materials Research Center (MMRC), Maleke Ashtar University of Technology, Tehran, 16788-15611, Iran

    Seyed Mahdi Abbasi

  3. Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea

    Daehwan Kim & Chong Soo Lee

Authors
  1. Seyed Amir Arsalan Shams
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  2. Shamsoddin Mirdamadi
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  3. Seyed Mahdi Abbasi
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  4. Daehwan Kim
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  5. Chong Soo Lee
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Correspondence to Chong Soo Lee.

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Manuscript submitted July 27, 2016.

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Shams, S.A.A., Mirdamadi, S., Abbasi, S.M. et al. Mechanism of Martensitic to Equiaxed Microstructure Evolution during Hot Deformation of a Near-Alpha Ti Alloy. Metall Mater Trans A 48, 2979–2992 (2017). https://doi.org/10.1007/s11661-017-4065-2

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  • DOI: https://doi.org/10.1007/s11661-017-4065-2

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