激光增材制造高强高韧TC11钛合金力学性能及航空主承力结构应用分析

doi:10.7527/S1000-6893.2021.25430

Abstract

Abstract: With the development of damage tolerance design concept and increasing requirement for lightweight, the high strength-toughness titanium alloy has been the main airframe material of load-bearing structure. Laser additive manufacturing has the advantages of digitization, short period and low cost in deposition of the large load bearing structure. Especially, the dynamics of solid phase transformation in the laser additive manufacturing process provide a new opportunity for the preparation of high strength-toughness titanium alloy. In this paper, the static strength, fatigue and damage tolerant properties of the laser additive manufactured TC11 titanium alloy were reported and analyzed according to the design requirements of airframe load-bearing structure. The prospects of using the alloy for the airframe load-bearing structure are then discussed. The results show that the alloy is characterized by high strength-toughness and low yield strength ratio. With low fatigue notch sensitivity, low fatigue crack growth rate and small dispersibility, the alloy can meet the requirements of mechanical properties of the airframe load-bearing structure. Compared with the damage tolerant TC4-DT titanium alloy that is now widely used for the airframe load-bearing structure, the laser additive manufactured TC11 titanium alloy shows similar damage tolerant properties, better fatigue performance, and improved static strength (by 23%). The excellent strength/toughness matching of the laser additive manufactured TC11 titanium alloy can avoid the occurrence of low stress brittle fracture in large thickness components, and low fatigue notch sensitivity and fatigue crack growth rate of the alloy are critical for ensuring service safety of the airframe load-bearing structure.

Key words: laser additive manufacture, titanium alloy, load-bearing structure, static strength, fatigue, damage tolerance

CLC Number:

V222

ZHANG Jikui, KONG Xiangyi, MA Shaojun, LIU Dong, WANG Xinbo, FENG Jun, WANG Huaming. Laser additive manufactured high strength-toughness TC11 titanium alloy: Mechanical properties and application in airframe load-bearing structure[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(10): 525430-525430.

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Laser additive manufactured high strength-toughness TC11 titanium alloy: Mechanical properties and application in airframe load-bearing structure

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