Effects of solution and aging temperature on microstructure and properties of as-cast TC18 alloy
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摘要: 钛合金具有相变复杂性以及相变敏感性，制备状态下的高强钛合金其显微组织及力学性能与对应的固溶-时效工艺直接相关。该研究对名义成分为Ti-5Al-5Mo-5V-1Cr-1Fe的TC18钛合金进行固溶-时效处理，对比研究不同固溶温度以及时效温度对其显微组织及力学性能的影响。结果表明，固溶-时效热处理对合金性能提升效果显著，固溶处理使合金基体中残存的初生α相粗化，其他区域形成过饱和固溶体，在接下来的时效过程中，β基体析出细小针状次生α相。在两种α相的配合影响下，合金整体强度提升明显。Abstract: Titanium alloys have phase transformation complexity and phase transformation sensitivity, and the influence factors of solution aging process corresponding to microstructure and mechanical properties of high-strength titanium alloys after heat treatment need to be further studied. The TC18 titanium alloy with nominal composition of Ti-5Al-5Mo-5V-1Cr-1Fe was subjected to solution-aging treatment, and the effects of different solution temperatures and aging temperatures on microstructure and mechanical properties were comparatively studied. The research results show that the solution-aging heat treatment method has a significant effect on improving the properties of the alloy. The solution treatment leads to coarsening primary α phase remaining in the alloy matrix, and supersaturated solid solution in other areas. During the subsequent aging process, needle-like secondary alpha phase precipitates in the β matrix s. Combination of the primary and secondary α phases significantly contributes to the improved overall strength of the alloy.
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Key words:
- TC18 titanium alloy /
- solution /
- aging /
- secondary α phase /
- mechanical properties /
- microstructure
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图 2 TC18钛合金热处理工艺示意
Figure 2. Schematic diagram of heat treatment process of TC18 alloy
图 3 TC18合金固溶处理后的显微组织SEM形貌
Figure 3. SEM impages of TC18 alloy after solution treatment at different temperatures
(a)(d) 750 ℃; (b)(e) 800 ℃; (c)(f) 850 ℃
图 4 TC18合金不同固溶处理后的力学性能
Figure 4. Mechanical properties of TC18 alloy after different solution treatments
图 5 750 ℃固溶后不同时效温度的显微组织SEM形貌
Figure 5. SEM images of TC18 after 750 °C solution and then aging at different temperatures
(a)(d) 750 ℃+490 ℃; (b)(e) 750 ℃+530 ℃; (c)(f) 750 ℃+570 ℃
图 6 800 ℃固溶后不同时效温度的显微组织SEM形貌
Figure 6. SEM images of TC18 after 800 ℃ solution and then aging at different temperatures
(a)(d) 800 ℃+490 ℃; (b)(e) 800 ℃+530 ℃; (c)(f) 800 ℃+570 ℃
图 7 850 ℃固溶时效后的显微组织SEM形貌
Figure 7. SEM images of TC18 after 850 ℃ solution then aging at different temperatures
(a)(d) 850 ℃+490 ℃; (b)(e) 850 ℃+530 ℃; (c)(f) 850 ℃+570 ℃
图 9 不同固溶温度时效后拉伸曲线
Figure 9. Tensile curves of TC18 after heat treatment with different solution and aging temperatures
固溶温度：(a) 750 ℃; (b) 800 ℃; (c) 850 ℃
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