티타늄 합금 분말 소결체의 고온 변형 거동 및 미세조직 연구
Hot Deformation Behavior and Microstructural Evolution of Powder Metallurgy Ti-6Al-4V Alloy
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The effects of processing parameters on the flow behavior and microstructures were investigated in hotcompression of powder metallurgy (P/M) Ti-6Al-4V alloy. The alloy was fabricated by a blended elemental (B/E)approach and it exhibited lamellar α+β microstructure. The hot compression tests were performed in the range of temperature800-1000oC with 50oC intervals, strain rate 10−4-10 s−1, and strain up to 0.5. At 800-950oC, continuous flowsoftening after a peak stress was observed with strain rates lower than 0.1 s−1. At strain rates higher than 1 s−1, rapiddrop in flow stress with strain hardening or broad oscillations was recorded. The processing map of P/M Ti-6Al-4V wasdesigned based on the compression test and revealed the peak efficiency at 850oC and 0.001 s−1. As the processing temperatureincreased, the volume fraction of β phase was increased. In addition, below 950oC, the globularization of phaseat the slower strain rate and kinking microstructures were found. Based on these data, the preferred working conditionof the alloy may be in the range of 850-950oC and strain rate of 0.001-0.01 s−1.
Abstract
The effects of processing parameters on the flow behavior and microstructures were investigated in hotcompression of powder metallurgy (P/M) Ti-6Al-4V alloy. The alloy was fabricated by a blended elemental (B/E)approach and it exhibited lamellar α+β microstructure. The hot compression tests were performed in the range of temperature800-1000oC with 50oC intervals, strain rate 10−4-10 s−1, and strain up to 0.5. At 800-950oC, continuous flowsoftening after a peak stress was observed with strain rates lower than 0.1 s−1. At strain rates higher than 1 s−1, rapiddrop in flow stress with strain hardening or broad oscillations was recorded. The processing map of P/M Ti-6Al-4V wasdesigned based on the compression test and revealed the peak efficiency at 850oC and 0.001 s−1. As the processing temperatureincreased, the volume fraction of β phase was increased. In addition, below 950oC, the globularization of phaseat the slower strain rate and kinking microstructures were found. Based on these data, the preferred working conditionof the alloy may be in the range of 850-950oC and strain rate of 0.001-0.01 s−1.
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