A method for predicting the dynamic recrystallization fraction of highly alloyed materials under time-varying conditions

A recrystallization and alloying technology, applied in the field of forging, can solve problems affecting prediction accuracy and other issues

Inactive Publication Date: 2017-11-14
CENT SOUTH UNIV
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Problems solved by technology

[0004] In addition, the biggest disadvantage of the existing dynamic recrystallization kinetic model is that it can only be used to predict the dynamic recrystallization fraction under the condition of constant temperature and constant strain rate. The average value of the strain rate is used in the calculation, which greatly affects its prediction accuracy

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  • A method for predicting the dynamic recrystallization fraction of highly alloyed materials under time-varying conditions
  • A method for predicting the dynamic recrystallization fraction of highly alloyed materials under time-varying conditions
  • A method for predicting the dynamic recrystallization fraction of highly alloyed materials under time-varying conditions

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[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] The present invention predicts the method for the dynamic recrystallization fraction of highly alloyed material under a kind of time-varying working condition, below with predicting typical highly alloyed material GH4169 alloy (its initial structure is as follows figure 1 Shown) dynamic recrystallization fraction is example, introduces in detail the specific implementation details of the prediction method that the present invention relates to, and its method comprises:

[0026] Step 1: Obtain the true stress-true strain curves of the GH4169 alloy under different deformation conditions and thermal simulation samples retaining the deformed structure through thermal compression simulation experiments at constant temperature and constant strain rate. The process parameters of the thermal simulation experiment at constant temperature and co...

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Abstract

The invention discloses a method for predicting dynamic recrystallization fractions of high-alloy materials under time-varying working conditions. The method includes steps of (1), acquiring deformed test specimens of the materials through hot compression simulation experiments; (2), acquiring metallographs of the test specimens through metallographic experiments; (3), counting recrystallization fractions of the test specimens by the aid of Photoshop software; (4), acquiring equivalent strain values and average strain rate values of the test specimens by the aid of finite element simulation; (5), acquiring parameters of the traditional dynamic recrystallization kinetic model by means of regression; (6), improving the traditional dynamic recrystallization kinetic models to obtain novel models capable of predicting the dynamic recrystallization fractions under the time-varying working conditions. The method has the advantages that the method can be used for building the dynamic recrystallization kinetic models for the high-alloy materials and also can be used for predicting the dynamic recrystallization fractions under the time-varying working conditions.

Description

Technical field: [0001] The invention belongs to the technical field of forging, and relates to a method for predicting the dynamic recrystallization fraction of high-alloyed materials under time-varying working conditions. Background technique: [0002] High-alloyed metals, such as nickel-based superalloys and iron-based superalloys, are widely used in manufacturing due to their high strength, good fatigue resistance, creep resistance, oxidation resistance, and corrosion resistance at higher temperatures Key components in the fields of aviation, aerospace, ships, electric power and other fields with complex shapes and particularly high performance requirements. [0003] For high-alloyed materials such as nickel-based superalloys and iron-based superalloys, the flow stress during high-temperature deformation is not only affected by mechanisms such as dynamic recovery and dynamic recrystallization, but also has solid solution strengthening due to changes in the content of sol...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/20G01N25/00
CPCG01N25/00G01N33/20
Inventor 陈明松蔺永诚李阔阔
Owner CENT SOUTH UNIV
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