Influence of heat treatment on microstructure and mechanical properties of ZTC4 titanium alloy
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摘要: 采用金相显微镜(OM)研究了热处理制度对ZTC4钛合金显微组织的演变规律，以及显微组织对力学性能的影响关系。结果表明：ZTC4钛合金铸件由马氏体α′相组成，进行退火以及热等静压+退火热处理后，显微组织均为典型魏氏组织。ZTC4钛合金铸件退火后抗拉强度可达955 MPa，其延伸率和断面收缩率分别为8.8%和13.1%。采用热等静压+退火热处理后，抗拉强度降低至892 MPa，但其延伸率和断面收缩率升高至11.2%和21.4%。采用热等静压热处理，可破碎原始β相晶粒，形成破碎的晶界α相，提高ZTC4钛合金塑性性能。Abstract: The optical microscope (OM) was employed to investigate the influence of heat treatment on microstructure evolution of ZTC4 titanium alloy, and the relationship between microstructure and mechanical properties was discussed. The results showed that the ZTC4 titanium alloy casting was composed of martensitic phase α′. A typical Widmanstatten microstructure was always obtained after annealing or hot isostatic pressing followed by annealing heat treatment. The tensile strength of ZTC4 titanium alloy casting after annealing can reach 955 MPa, and its elongation and reduction of area were only 8.8% and 13.1%, respectively. After hot isostatic pressing followed by annealing heat treatment, the tensile strength was reduced to 892 MPa, but its elongation and reduction of area were increased to 11.2% and 21.4%. The hot isostatic pressing heat treatment can break the original β phase grains, which improve the plastic properties of ZTC4 titanium alloy.
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Key words:
- ZTC4 titanium alloy /
- heat treatment /
- microstructure /
- mechanical properties
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图 1 不同热处理工艺条件下ZTC4钛合金铸件显微组织
（a）铸态；(b)退火；(c)热等静压；(d)热等静压+退火
Figure 1. Microstructures of ZTC4 titanium alloy castings at various heat treatments
表 1 ZTC4钛合金铸件化学成分及验收标准
Table 1. Chemical compositions of ZTC4 titanium alloy casting and standard
% ZTC4钛合金 Ti Al V Fe Si C N H O 铸锭成分 Bal. 6.40 4.38 0.19 0.02 0.014 0.006 0.002 0.14 GB/T 15073—1994 Bal. 5.5～6.8 3.5～4.5 ≤0.3 ≤0.15 ≤0.10 ≤0.05 ≤0.015 ≤0.20 
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表 2 不同热处理工艺条件下ZTC4钛合金显微组织参数
Table 2. Microstructure parameters of ZTC4 titanium alloy at various heat treatments
热处理工艺 平均片层α相尺寸/μm 平均晶界α相尺寸/μm 铸态 1.1 3.5 退火态 2.5 4.8 热等静压态 4.6 7.6 热等静压+退火态 6.2 10.6
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表 3 ZTC4钛合金在不同热处理工艺条件下的室温力学性能
Table 3. Mechanical properties of ZTC4 titanium alloy castings at various heat treatments
热处理工艺 Rm/MPa Rp0.2/MPa A/% Z/% 铸态 942 860 8.0 12.2 退火态 955 897 8.8 13.1 热等静压态 911 851 9.5 15.3 热等静压+退火态 892 834 11.2 21.4
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