Effect of double annealing on microstructure and mechanical properties of near-α titanium alloys

YANG Ruize; LUAN Chao; HE Wenxuan; LI Xuqing; GUO Yifeng; XU Bin; SUN Mingyue

doi:10.7513/j.issn.1004-7638.2026.02.007

Volume 47 Issue 2

Apr. 2026

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YANG Ruize, LUAN Chao, HE Wenxuan, LI Xuqing, GUO Yifeng, XU Bin, SUN Mingyue. Effect of double annealing on microstructure and mechanical properties of near-α titanium alloys[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(2): 55-62, 131. doi: 10.7513/j.issn.1004-7638.2026.02.007

Citation:

YANG Ruize, LUAN Chao, HE Wenxuan, LI Xuqing, GUO Yifeng, XU Bin, SUN Mingyue. Effect of double annealing on microstructure and mechanical properties of near-α titanium alloys[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(2): 55-62, 131. doi: 10.7513/j.issn.1004-7638.2026.02.007

Citation:

YANG Ruize, LUAN Chao, HE Wenxuan, LI Xuqing, GUO Yifeng, XU Bin, SUN Mingyue. Effect of double annealing on microstructure and mechanical properties of near-α titanium alloys[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(2): 55-62, 131. doi: 10.7513/j.issn.1004-7638.2026.02.007

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Effect of double annealing on microstructure and mechanical properties of near-α titanium alloys

doi: 10.7513/j.issn.1004-7638.2026.02.007

YANG Ruize^1
,,
LUAN Chao^{1, 2},
HE Wenxuan^{3, 4},
LI Xuqing¹,
GUO Yifeng^{1, 2
,
,},
XU Bin^{3, 4},
SUN Mingyue^{1, 3, 4}

1.
JITRI Advanced Materials R&D Co., Ltd., Suzhou 215131, Jiangsu, China
2.
Suzhou National Laboratory, Suzhou 215123, Jiangsu, China
3.
Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China
4.
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China

More Information

Received Date: 2026-01-26
Accepted Date: 2026-03-10
Rev Recd Date: 2026-03-04

Available Online: 2026-04-20

Publish Date: 2026-04-20

Abstract

Abstract

Ti6321 alloy, a near-α titanium alloy independently developed in China, has become a key structural material for marine engineering because of its high strength, high toughness and outstanding seawater-corrosion resistance. Nevertheless, under conventional heat treatment its strength and ductility are difficult to balance, restricting its use in deep-sea extreme environments. In this work, ship-grade Ti6321 alloy was subjected to single annealing (970, 980, 990, 1000 ℃ for 2 h, air cooled) and duplex annealing (980 ℃ for 2 h, air cooled, then 550 ℃ or 600 ℃ for 2 h, air cooled). The effects of these annealing routes on microstructure and mechanical properties were systematically investigated by optical microscopy (OM), scanning electron microscopy (SEM) and mechanical testing. The results revealed that single annealing produced the typical α+β two-phase microstructural evolution, with the best strength–toughness combination obtained at 980 ℃. Duplex annealing refined the microstructure by precipitating secondary α phases within and along the boundaries of the β-transformed structure, annealing treatment at 980 ℃ + 550 ℃ markedly increased both strength and toughness. This study provides a theoretical basis for optimizing the heat treatment process of Ti6321 alloy for marine engineering applications.
- titanium alloy,
- double annealing,
- dual-phase microstructure,
- mechanical properties

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References(23)

References

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