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首页> 外文期刊>ISIJ international >Strength-ductility relationship in solution treated and aged alpha plus beta type Ti-4.5%Al-3%V-2%Fe-2%Mo titanium alloy
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Strength-ductility relationship in solution treated and aged alpha plus beta type Ti-4.5%Al-3%V-2%Fe-2%Mo titanium alloy

机译：固溶处理和时效的Al加β型Ti-4.5％Al-3％V-2％Fe-2％Mo钛合金的强度-延性关系

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摘要

The microstructural variation with solution treating or aging conditions in SP-700 alloy with Ti-4.5%Al3%V-2%Fe-2%Mo was investigated, and the effect of the microstructure on strength-ductility balance of this alloy was studied by tensile testing using both the smooth and notched specimens. Solution treating in the alpha+beta region formed a two-phase microstructure consisting of the primary a and transformed P phases, and the microstructure and hardness of the latter were widely varied by the cooling rate. The microstructures of the transformed beta obtained by water quenching were alpha" athermal omega and retained beta phases, while air cooling formed acicular alpha in beta matrix and its width became thicker with reduction of cooling rate. Waterquenched and aged alloy exhibited better strength-ductility balance compared with air-cooled and aged one, which appeared to be due to retardation of void formation during straining. Strength after aging in this alloy could be analyzed by a law of mixture, and micro-hardness and the volume fraction of the transformed beta phase were found primarily to control strength. Reduction of hardness difference between the.primary alpha and transformed beta phases by the increase of the oxygen content of this alloy improved strength-ductility balance. Notch tensile strength increased with strengthening due to age-hardening and also the increase of cooling rate after solution treating, and showed a peak value at tensile strength of around 1 300 MPa.
机译：研究了Ti-4.5％Al3％V-2％Fe-2％Mo的SP-700合金在固溶或时效条件下的显微组织变化，并研究了显微组织对这种合金强度-延展性平衡的影响。使用光滑和缺口样品进行拉伸测试。在α+β区域中进行固溶处理，形成了由初级a相和转化P相组成的两相微观结构，而后者的微观结构和硬度因冷却速率而有很大差异。通过水淬获得的转变后的β的微观结构为α”无热ω并保留β相，而空气冷却在β基体中形成针状α，其宽度随着冷却速率的降低而变厚。经水淬和时效的合金表现出更好的强度-延展性平衡与风冷和时效的相比，这似乎是由于应变过程中空隙形成的延迟所致，该合金的时效后强度可以通过混合定律，显微硬度和相变β相的体积分数进行分析。被发现主要是控制强度，通过增加该合金的氧含量来减少初生α相和相变β相之间的硬度差，改善了强度-延展性的平衡，缺口时的抗拉强度随着时效硬化的增加而增强。固溶处理后冷却速率增加，并且在抗张强度处显示出约1300MPa的峰值。

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