Prediction method for titanium alloy die forging part basket-weave microstructure distribution

Abstract

The invention provides a prediction method for titanium alloy die forging part basket-weave microstructure distribution. The prediction method comprises the following steps: S1, performing tissue teston a material under different deformation conditions; S2, obtaining rheological curve through thermal compression deformation experiments under different deformation parameters, obtaining a constitutive model capable of predicting titanium alloy deformation resistance through numerical analysis and simultaneously analyzing effects of deformation parameters on a microstructure evolvement rule; S3,establishing critical criterion; S4, establishing a visual prediction model of die forging part basket-weave microstructure distribution through finite element software secondary development based onthe critical technological conditions of basket-weave microstructure formation and comparing, analyzing and verifying the visual prediction model with actual results. The established prediction method for titanium alloy die forging part basket-weave microstructure distribution disclosed by the invention disclosed by the invention can effectively reveal microstructure change of titanium alloy after forged hardening and can predict basket-weave tissue distribution in forged pieces under the certain conditions.

Description

technical field [0001] The invention relates to the technical field of forging forming microstructure prediction models of titanium alloy die forgings, and in particular provides a method for predicting the distribution of net basket structures of titanium alloy forgings. Background technique [0002] Due to its low density, high specific strength, good heat resistance and good low temperature performance, titanium alloys have been widely used in the aerospace industry, which has a strong demand for high life and light weight. In the 1960s, the amount of titanium alloy used on aircraft increased rapidly, and important load-bearing components such as bulkheads and beams were made of titanium alloy instead of structural steel. For example, the amount of titanium alloy used in the Boeing 757 airliner accounts for 5% of the entire structure, and the DC10 aircraft produced by McDonnell Douglas has a titanium alloy amount of 5500Kg. [0003] With the vigorous development of the n...

AI Technical Summary

Problems solved by technology

In order to ensure the performance requirements of certain types of titanium alloy large-scale die forgings, all positions of the forgings after forging are required to be net basket structures, and the non-net basket structures are required to be completely removed, but because it is difficult to completely avoid, it is hoped that the non-network The thickness of the basket structure layer should be reduced as much as possible to keep the layer thickness within the range of machining allowance. Therefore, strict control of the forming process is required, which is of great significance for improving the yield of titanium alloy die forgings, and there are huge challenges

In addition, the quantitative dependence of the structure of the titanium alloy basket on the deformation parameters during die forging, such as temperature and deformation, is still unclear, and there is a lack of a visual model that can directly determine the distribution of the basket structure in the forging

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