As-cast strong and tough ti3al intermetallic compound and its manufacturing method and application

Abstract

The invention belongs to the field of Ti-Al intermetallic compounds, and in particular relates to a cast toughened Ti3Al intermetallic compound as well as a preparation method and application thereof. The cast toughened Ti3Al intermetallic compound comprises constitution factors such as alloy components, smelting, precise casting and thermal treatment. The alloy components comprise 10.2-11.8 percent by weight of Al, 26.0-29.0 percent by weight of Nb, 1.0-3.0 percent by weight of Mo, and the balance of Ti and inevitable impurity elements, wherein the inevitable impurity elements comprise Fe, Si, O, N and H; Fe is less than or equal to 0.3%; Si is less than or equal to 0.3%, O is less than or equal to 0.15%; N is less than or equal to 0.04%; and H is less than or equal to 0.01%. Therefore, with the combination of the component optimization process and the thermal treatment processes, different matches between tensile strength and plasticity and between fatigue strength and thermal stability can be achieved, and the compound can be also used for manufacturing precise cast parts such as high-temperature parts of aero-engines, and can be used for a long time at 600-700 DEG C; and the alloy can be also used for manufacturing high-temperature resistant structural parts of aerospace crafts, and can be used for a short time at 650-750 DEG C.

Description

technical field

[0001] The invention belongs to the field of Ti-Al intermetallic compounds, and specifically relates to a new type of cast tough Ti which can be used for a long time (≥500 hours) at 600°C to 700°C or for a short time at 650°C to 750°C. 3 Al intermetallic compound and its manufacturing method and application. Background technique

[0002] In order to improve the thrust-to-weight ratio of aero-engines, it is necessary to focus on breakthroughs in key technologies such as aerodynamic design, structural design, materials, and processes of engine components. One of the main ways to reduce the weight of the engine structure is to use as many lightweight materials as possible, but currently The maximum service temperature of deformed titanium alloy is 600°C, and the maximum service temperature of cast titanium alloy is only 500°C. The service temperature limits the expansion of the use range of titanium alloy. Ti 3 Al alloy density is low (less than 5g / cm 3 ), hi...

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