Journal
METALS AND MATERIALS INTERNATIONAL
Volume 23, Issue 4, Pages 648-659Publisher
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-017-6730-9
Keywords
fatigue; mechanical properties; residual stress; Ti-6Al-4V; microstructure
Funding
- Engineering Research Center (ERC) Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2011-0030801]
- National Research Foundation of Korea (NRF) - Korean Government [NRF-2016H1D2A2916874]
- Industrial Technology Innovation Program - Ministry of Trade, industry Energy [10050561]
- Fundamental Research Program of the Korea Institute of Materials Science (KIMS)
- Korea Evaluation Institute of Industrial Technology (KEIT) [10050561] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [PNK5050] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2011-0030058, 2016H1D2A2916874, 21A20151713274] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The effects of stabilization annealing and cooling rate on high cycle fatigue (HCF) and fatigue crack propagation (FCP) behaviors of beta-processed Ti64 alloys were examined. After beta-process heating above beta transus, two different cooling rates of air cooling (beta-annealing) and water quenching (beta-quenching) were utilized. Selected specimens were then underwent stabilization annealing. The tensile tests, HCF and FCP tests on conducted on the beta-processed Ti64 specimens with and without stabilization annealing. No notable microstructural and mechanical changes with stabilization annealing was observed for the beta-annealed Ti64 alloys. However, significant effect of stabilization annealing was found on the FCP behavior of beta-quenched Ti64 alloys, which appeared to be related to the built-up of residual stress after quenching. The mechanical behavior of beta-processed Ti64 alloys with and with stabilization annealing was discussed based on the micrographic examination, including crack growth path and crack nucleation site, and fractographic analysis.
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