Mechanism of Martensitic to Equiaxed Microstructure Evolution during Hot Deformation of a Near-Alpha Ti Alloy
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SCOPUS
- Title
- Mechanism of Martensitic to Equiaxed Microstructure Evolution during Hot Deformation of a Near-Alpha Ti Alloy
- Authors
- SHAMS, SEYED AMIR ARSALAN; MIRDAMADI, SHAMSODDIN; ABBASI, SEYED MAHDI; KIM DAEHWAN; LEE, CHONG SOO
- Date Issued
- 2017-06
- Publisher
- SPRINGER
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/39082
- DOI
- 10.1007/s11661-017-4065-2
- ISSN
- 1073-5623
- Article Type
- Article
- Citation
- METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 48A, no. 6, page. 2979 - 2992, 2017-06
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