Microstructure and Properties of SP-700 Titanium Alloy after High Temperature Solid Solution and Aging with Different Processes

LI Cong; DING Zhili; HUANG Can; ZHOU Libo; CHEN Wei; CHEN Jian

doi:10.11973/jxgccl202301007

Materials and Mechanical Engineering > 2023 > 47(1): 48-55,64. > DOI: 10.11973/jxgccl202301007

LI Cong, DING Zhili, HUANG Can, ZHOU Libo, CHEN Wei, CHEN Jian. Microstructure and Properties of SP-700 Titanium Alloy after High Temperature Solid Solution and Aging with Different Processes[J]. Materials and Mechanical Engineering, 2023, 47(1): 48-55,64. DOI: 10.11973/jxgccl202301007

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Microstructure and Properties of SP-700 Titanium Alloy after High Temperature Solid Solution and Aging with Different Processes

School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China

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Received Date: January 07, 2022
Revised Date: November 30, 2022

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Abstract

SP-700 titanium alloy was treated by solid solution in β phase region at 1 000℃ for 15 min, and then was cooled to (α+β) phase region for solid solution at different temperatures (650-900℃) for different times (3-10 min) or was treated by single stage aging and or double stage aging including 280℃ low temperature pre-aging and the second aging at different temperatures (370-650℃) for different times (15, 90 min). The microstructure and properties of the alloy under different processes were studied. The results show that the volume fraction of α phase in the alloy after 850℃ solid solution increased with the solid solution time; when the solid solution time was 5 min, the alloy had good strong plastic matching. Under solid solution time of 5 min, the volume fraction of α phase decreased with increasing solid solution temperature; when the solid solution temperature was 650℃, the alloy had good strong-plastic matching. After β phase region solid solution and single/double stage aging, the alloy was basically composed of β grain, α phase and acicular martensite. After single stage aging at aging temperature of 650℃ for 90 min or double stage aging at aging temperature of 650℃ for 15 min, the alloy showed good strong-plastic matching.
- SP-700 titanium alloy,
- solid solution and aging,
- microstructure,
- compression property

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