随着飞机结构件用钛量的大幅度增加,对钛合金的性能要求也随飞机设计概念的改变而改变,在追求钛合金高强度的同时,也要求合金具有高的韧性。为设计一种强度高于1200 MPa、断裂韧性大于65 MPa·m1/2的新型高强高韧钛合金,在计算合金Mo当量的基础上,合金设计时综合考虑了合金元素对α相、β相的强化和韧化的影响,以及微观组织对强韧性的影响,设计获得一种新型高强高韧富β型的钛合金Ti-5321。实验室条件下30 kg铸锭和中试条件下500 kg铸锭试制的棒材在较理想的显微组织下,新设计的合金室温抗拉强度大于1200 MPa、延伸率大于8%、断裂韧性大于65 MPa·m1/2,相比于现有高强高韧钛合金,显示出明显优势。
Ti usage in airplane is obviously increasing, the requirements for Ti-alloys are changing to high strength and high toughness with the changing of airplane design concept. In order to design a new Ti-alloy with tensile strength over 1200 MPa and fracture toughness over 65 MPa · m1/2 , the following factors should be paid attention to: Mo equivalent, effects of alloying elements and microstructures on strength and toughness ofαphase andβphase. A new Ti alloy named as Ti-5321 was designed, which is a rich-β alloy. Bars were forged from 30 kg and 500 kg ingots. With the ideal microstruc-ture, the bars of the new alloy have a good match between strength and toughness, that is , tensile strength over 1200 MPa, e-longation over 8% and fracture toughness over 65 MPa·m1/2 . Compared with the TC21, Ti-5553 and Ti-55531 alloy, the new alloy possesses obvious advantages.
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