β-Texture Evolution of a Near-β Titanium Alloy During Cooling After Forging in the β Single-Phase and (α + β) Dual-Phase Regions

L. Meng, T. Kitashima, T. Tsuchiyama, M. Watanabe

Research output: Contribution to journalArticlepeer-review

Abstract

β-Texture evolution during cooling after forging in the β single-phase region and (α + β) dual-phase region was investigated in Ti-6Al-2Sn-4Zr-6Mo alloy. Typical {001} and {111} β fiber textures of the β phase developed during forging. Dynamic-recrystallized β grains formed and inherited the orientation of their parent grains during forging in the β single-phase region. The {001} texture was enhanced with decreasing cooling rate after forging in the β region, that is, as cooling time in the β region increased. The results of the post-forging holding in the β region demonstrated that the recrystallized grains that grew in the β region consumed the adjacent {111}-oriented parent grains and initially enhanced the {001} texture. However, the enhancement of the {001} texture was moderated with increasing holding time because of the increased orientation deviation between the recrystallized grains and the parent grains. In addition, the {001} β texture was weakened by the growth of static-recrystallized grains after its incubation period during the holding time. These results indicate that growth of dynamic-recrystallized and static-recrystallized grains moderated the increase of the {001} texture intensity at low cooling rates of specimens forged in the β region. In specimens forged near the β-transus temperature and in the (α + β) dual-phase region, the {001} texture intensity was only slightly affected by the cooling rate. Recrystallization of the β phase was suppressed by the precipitation of the α phase during forging and cooling at low temperatures. A slow cooling rate of − 2 °C/s was determined by measuring the temperature change of a large specimen similar in size to those used in real-world applications.

Original languageEnglish
Pages (from-to)303-315
Number of pages13
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume52
Issue number1
DOIs
Publication statusPublished - Jan 2021

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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