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Ti-1300合金是一种亚稳β钛合金,为了从组织形貌方面解释其高强高韧的特性,对此钛合金的相变特征进行了研究。研究结果表明,由于α相的球化,此钛合金抗拉强度可达1400MPa以上,同时发现特定的板条状α相有利于保持此钛合金较高的断裂韧性(KQ≥81MPa·m1/2),与针状二次α相相比,板条状二次α相应力集中程度较轻,因此有利于获得较高的韧性。对时效过程中α相的形貌变化进行了研究,并从热力学和动力学上进行了描述,同时给出了一种比较合理的热处理制度。
Ti-1300 alloy is a metastable β-titanium alloy. In order to explain its high-strength and high-toughness characteristics from the aspects of the microstructure, the phase transition characteristics of the titanium alloy were studied. The results show that due to the α-phase spheroidization, the tensile strength of the titanium alloy can reach over 1400MPa, and the specific lamellar α phase is found to be beneficial to maintain the high fracture toughness of the titanium alloy (KQ≥81MPa · m1 / 2 ), Compared with acicular secondary α phase, slab-like secondary α concentration of light stress is less, so help to obtain higher toughness. The phase change of α phase in aging process was studied and described from thermodynamics and kinetics. At the same time, a more reasonable heat treatment system was given.