Effects of volume fraction of tempered martensite on dynamic deformation properties of a Ti-6Al-4V alloy having a bimodal microstructure
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- Title
- Effects of volume fraction of tempered martensite on dynamic deformation properties of a Ti-6Al-4V alloy having a bimodal microstructure
- Authors
- Lee, DG; Lee, YH; Lee, CS; Lee, S
- Date Issued
- 2005-03
- Publisher
- MINERALS METALS MATERIALS SOC
- Abstract
- The effects of the volume fraction of tempered martensite on the tensile and dynamic deformation properties of a Ti-6A1-4V alloy having a bimodal microstructure were investigated in this study. Five microstructures having various tempered-marten site volume fractions were obtained by varying heat-treatment conditions. Dynamic torsional tests were conducted on them using a torsional Kolsky bar. The test data were analyzed in relation to microstructures, tensile properties, and adiabatic shear-band formation. Under a dynamic loading condition, the maximum shear stress increased with increasing ternpered-martensite volume fraction, whereas the fracture shear strain decreased. Observation of the deformed area after the dynamic torsional test indicated that a number of voids initiated mainly at alpha-phase/tempered-martensite interfaces, and that the number of voids increased with increasing : martensite volume fraction. Adiabatic shear bands of 6 to 10 mum in width were formed in the specimens having lower martensite volume fractions, while they were not formed in those having higher martensite volume fractions. The possibility of adiabatic shear-band formation was explained by concepts of absorbed deformation energy and void initiation.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/24727
- DOI
- 10.1007/s11661-005-1005-3
- ISSN
- 1073-5623
- Article Type
- Article
- Citation
- METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 36A, no. 3A, page. 741 - 748, 2005-03
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