期刊
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
卷 52, 期 7, 页码 3107-3121出版社
SPRINGER
DOI: 10.1007/s11661-021-06305-6
关键词
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资金
- Japan Science and Technology (JST) through Cross-ministerial Strategic Innovation Promotion Program Cabinet Office, Government of Japan, Structural Materials for Innovation (SIP-SM4I)
- ISIJ Innovative Program for Advanced Technology by Iron and Steel Institute of Japan (ISIJ)
This study investigates the effect of deformation temperature, strain rate, and strain on the deformation behavior and microstructure evolution in Ti-17 alloy. Dynamic recovery is the dominant restoration mechanism during deformation, while alpha precipitation occurs at beta boundaries during deformation at temperatures less than T-beta.
This study investigates the effect of deformation temperature, strain rate, and strain on the deformation behavior above and below the beta (beta) transus temperature (T-beta), as well as the alpha (alpha) + beta microstructure evolution, in Ti-17 alloy during deformation and subsequent cooling to room temperature. Dynamic recovery is the dominant restoration mechanism of the beta matrix during hot deformation above and below the T-beta, which leads to the formation of subgrain structure under applied conditions. During deformation at temperatures less than the T-beta, the alpha phase precipitates at beta grain boundaries initially in a globular or film shape (GB(alpha)), followed by the formation of Widmanstatten alpha (W-alpha) plates from the GB(alpha) and inside the beta grains. The alpha precipitation kinetics is accelerated by increasing the deformation strain during deformation at temperatures less than the T-beta. Even at temperatures greater than the T-beta, deformation is found to induce alpha-phase precipitation at beta boundaries. Further, alpha-phase precipitation occurs during slow cooling after deformation, whereas greater deformation strain leads to a decrease in the total alpha-phase fraction because the enrichment of Mo and Cr and the depletion of Al in the beta phase by the formation of W-alpha at higher temperatures stabilizes the beta phase and thus suppresses the subsequent beta -> alpha transformation during cooling.
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