Effect of cooling rate during solution heat treatment on the microstructure and mechanical properties of SP-700 titanium alloys

Jo Kuang Nieh, Chih Ting Wu, Yen Lin Chen, Chao Nan Wei, Sheng Long Lee

研究成果: 雜誌貢獻期刊論文同行評審

7 引文 斯高帕斯(Scopus)

摘要

The relationship between the microstructures and the mechanical properties of solution-treated SP-700 titanium alloys, as obtained with different cooling rates, was investigated. The results indicate that the water-quenched alloy contains the primary α (αp), α"-martensite and residual β (βr) phases. Aging heat treatment can convert both α"-martensite and the βr phases to the fine-grained α + β equilibrium phases, resulting in a significant increase in tensile strength and hardness. Both the air-cooled and furnace-cooled alloys consist of the αp, α and β phases. The air-cooled alloy containing the fine-grained a phase has relatively higher hardness. Aging heat treatment causes only a slight enhancement in tensile properties because it cannot convert the phases in both alloys. Stress-induced martensitic phase transformation occurs in the water-quenched alloy under applied stress, after which the alloy exhibits higher tensile strength, higher ductility, and lower yield strength.

原文???core.languages.en_GB???
頁(從 - 到)99-106
頁數8
期刊Journal of Marine Science and Technology (Taiwan)
24
發行號2
DOIs
出版狀態已出版 - 2016

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