Microstructure and properties of ultra-high strength diffusion-bonded joint between TC21 titanium alloy and G50 steel

LIU Jiao; CHENG Peixin; XI Jinhui

doi:10.7513/j.issn.1004-7638.2025.03.007

Volume 46 Issue 3

Jun. 2025

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LIU Jiao, CHENG Peixin, XI Jinhui. Microstructure and properties of ultra-high strength diffusion-bonded joint between TC21 titanium alloy and G50 steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 41-44, 52. doi: 10.7513/j.issn.1004-7638.2025.03.007

Citation:

LIU Jiao, CHENG Peixin, XI Jinhui. Microstructure and properties of ultra-high strength diffusion-bonded joint between TC21 titanium alloy and G50 steel[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(3): 41-44, 52. doi: 10.7513/j.issn.1004-7638.2025.03.007

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Microstructure and properties of ultra-high strength diffusion-bonded joint between TC21 titanium alloy and G50 steel

doi: 10.7513/j.issn.1004-7638.2025.03.007

Western Metal Materials Co., Ltd., Xi’an 710201, Shaanxi, China

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Received Date: 2024-12-16
Available Online: 2025-06-30
Publish Date: 2025-06-30

Abstract

Abstract

An ultra-high strength joint between TC21 titanium alloy and G50 high-strength steel had been prepared by an improved diffusion bonding in this study. Under the constraints of a rigid mold, the diffusion bonding using the V and Cu as interlayers was carried out at 915 ℃ for 60 minutes with an axial load of 20 MPa. Unlike the traditional diffusion bonding processes where the joint was under unidirectional compressive stress, the bonded samples in this study were subjected to triaxial compressive stress state, which promoted more sufficient metal flow and elemental diffusion at the interfaces. This effectively eliminated interfacial defects such as voids and micro-pores. The tensile strength of the joint was as high as 752 MPa, which was so far the highest that have been reported in the literature for the joints between titanium and steel prepared by diffusion bonding. The interface analysis showed that there were no precipitates at the TC21/V and V/Cu interfaces, and Fe-rich precipitates were observed at the Cu/G50 interface. In the tensile test, the fracture occurred in the interface between Cu and G50, resulting from the Fe-rich precipitates.
- TC21 titanium alloy,
- G50 high-strength steel,
- diffusion bonding,
- ultra high strength joint

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References(14)

References

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