Forging property, processing map, and mesoscale microstructural evolution modeling of a Ti-17 alloy with a lamellar (α+β) starting microstructure

Hiroaki Matsumoto, Daiki Naito, Kento Miyoshi, Kenta Yamanaka, Akihiko Chiba, Yoko Yamabe-Mitarai

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

This work identifies microstructural conversion mechanisms during hot deformation (at temperatures ranging from 750 °C to 1050 °C and strain rates ranging from 10−3 s−1 to 1 s−1) of a Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti-17) alloy with a lamellar starting microstructure and establishes constitutive formulae for predicting the microstructural evolution using finite-element analysis. In the α phase, lamellae kinking is the dominant mode in the higher strain rate region and dynamic globularization frequently occurs at higher temperatures. In the β phase, continuous dynamic recrystallization is the dominant mode below the transition temperature, Tβ (880~890 °C). Dynamic recovery tends to be more active at conditions of lower strain rates and higher temperatures. At temperatures above Tβ, continuous dynamic recrystallization of the β phase frequently occurs, especially in the lower strain rate region. A set of constitutive equations modeling the microstructural evolution and processing map characteristic are established by optimizing the experimental data and were later implemented in the DEFORM-3D software package. There is a satisfactory agreement between the experimental and simulated results, indicating that the established series of constitutive models can be used to reliably predict the properties of a Ti-17 alloy after forging in the (α+β) region.

Original languageEnglish
Pages (from-to)893-904
Number of pages12
JournalScience and Technology of Advanced Materials
Volume18
Issue number1
DOIs
Publication statusPublished - 2017 Dec 31

Keywords

  • Ti-5Al-2Sn-2Zr-4Mo-4Cr alloy
  • dynamic globularization
  • finite element simulation
  • microstructural prediction
  • processing map

ASJC Scopus subject areas

  • Materials Science(all)

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