TC18 titanium alloy basketweave microstructure fracture toughness prediction method

Abstract

A TC18 titanium alloy basketweave microstructure fracture toughness prediction method comprises the following steps: establishing a fracture toughness prediction model based on the tensile performance and the crack expansion path of titanium alloy through comprehensively considering influences of the intrinsic fracture resistance and external fracture resistance on the fracture toughness of the titanium alloy, and working out concrete enforcement standards for using the model to carry out titanium alloy fracture toughness prediction. Obtaining of the sinuosity of the crack expansion path of the titanium alloy is an important link in the fracture toughness predication of the titanium alloy in the invention. The method allows the fracture toughness of the TC18 titanium alloy to be successfully predicated, and the predication error is not greater than 8%. The method is suitable for any kind of titanium alloys with any microstructure.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for effectively predicting the fracture toughness of titanium alloys. Background technique [0002] Since the 1940s, due to the frequent accidents of passenger planes, the concept of aircraft structural parts has changed from the concept of pure static strength design to the concept of safety-life design, damage-safety design, and the modern damage tolerance design criterion. In the damage tolerance design criteria, fracture toughness is an important indicator, which characterizes the ability of materials to prevent crack propagation, so ensuring the fracture toughness of aerospace structural parts is crucial to its safe flight. Due to the importance of fracture toughness, domestic and foreign scholars have been trying to establish a prediction method for fracture toughness of materials. A lot of work has been done abroad on the prediction of fracture toughness. In 1964, Kraff...

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Problems solved by technology

It is well known that the fracture toughness of titanium alloys is particularly sensitive to the microstructure. However, the description of the fracture toughness variation law of titanium alloys under different microstructure characteristics at home and abroad is only in the qualitative category, and no fracture properties applicable to different microstructures of titanium alloys have been established. Toughness Quantitative Prediction Methods and Corresponding Specifications

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