Effects of carbon microalloying on microstructure and mechanical properties of low-cost Ti-4.5Al-3.5Zr-2Fe titanium alloy
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摘要: 采用水冷铜坩埚真空感应悬浮熔炼炉制备了不同碳含量为0、0.1%、0.15%和0.3%的Ti-4.5Al-3.5Zr-2Fe低成本钛合金，研究了碳微合金化对钛合金铸态组织和力学性能的影响。结果表明：随着碳元素的引入，原始β晶粒以及α片层宽度尺寸有一定的细化，合金铸态凝固组织由魏氏组织逐渐转变为网篮组织，TiC在晶界析出。碳含量增加，合金强度增强，塑性降低，其中Ti-4.5Al-3.5Zr-2Fe-0.1C合金综合力学性能最佳，抗拉强度和屈服强度分别为 979 MPa 和 920 MPa，延伸率为 5.4%。Abstract: Low-cost Ti-4.5Al-3.5Zr-2Fe titanium alloys with different carbon content of 0, 0.1%, 0.15% and 0.3% were prepared in a water-cooled copper crucible vacuum induction levitation melting furnace. The effects of carbon microalloying on the as-cast microstructure and mechanical properties of the titanium alloys were investigated. The results show that with the introduction of carbon element, the original β grain and α lamellar width are refined to a certain extent, and the as-cast solidification microstructure of the alloy is gradually transformed from Widmanstätten microstructure to basket-weave microstructure, and TiC precipitates at grain boundary. Ti-4.5Al-3.5Zr-2Fe-0.1C alloy has the best comprehensive mechanical properties, with a tensile strength and yield strength of 979 MPa and 920 MPa, respectively, and an elongation of 5.4%.
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图 6 铸态合金中TiC形貌及分布
(a) TAZF-0.1C；(b) TAZF-0.15C；(c) TAZF-0.3C
Figure 6. Morphology and distribution of TiC in the as-cast alloys
图 7 铸态合金微观组织
(a) TAZF ；(b) TAZF-0.1C ；(c) TAZF-0.15C ；(d) TAZF-0.3C
Figure 7. Microstructures of the as-cast alloys
图 9 铸态合金的拉伸断口形貌
(a) TAZF；(b) TAZF-0.1C；(c) TAZF-0.15C；(d) TAZF-0.3C
Figure 9. Tensile fracture morphologies of the as-cast alloys
表 1 合金实际成分
Table 1. Chemical compositions of the alloys
% Ti Al Zr Fe C H O N TAZF Bal. 4.58 3.62 2.01 0 0.0045 0.036 0.005 TAZF-0.1C Bal. 4.66 3.5 1.98 0.11 0.0033 0.087 0.056 TAZF-0.15C Bal. 4.58 3.54 1.72 0.15 0.003 0.072 0.0045 TAZF-0.3C Bal. 4.78 3.49 2.14 0.31 0.0052 0.088 0.0054 
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表 2 铸态合金室温力学性能
Table 2. Mechanical properties of the as-cast alloys at RT
合金 σs/MPa σ0.2/MPa El/% TAZF 881.6 811.5 6.9 TAZF-0.1C 979 920 5.4 TAZF-0.15C 1005.7 930 3.8 TAZF-0.3C 1036 1003 1.3
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