Method for evaluating influence on mechanical property of material by ultralow-temperature cooling

Abstract

The invention belongs to the field of low temperature engineering and relates to a method for evaluating the influence on the mechanical property of a material by ultralow-temperature cooling. The method comprises the following steps: designing a Taguchi experiment by taking a cooling factor as an experimental variable, making an ultralow-temperature cooling scheme of a test piece, implementing ultralow-temperature cooling treatment on the test piece according to the scheme and performing mechanical property test; analyzing test data by a variance analysis method and calculating the contribution rate of the cooling factor on the mechanical property influence; constructing a relative importance ratio scale table and quantitatively calculating the weight of the cooling factor on the mechanical property influence by virtue of a level analysis method; calculating the weight that a certain mechanical property of the material accounts for the comprehensive properties; and determining the weight of the cooling factor on the influence on the comprehensive properties of the material so as to represent the influence on the mechanical property of the material by ultralow-temperature cooling.By the method, quantitative analysis on the weight of the cooling factor on the influence on the comprehensive mechanical properties of the material is realized, and the evaluation result is accurateand reliable.

Description

technical field [0001] The invention belongs to the field of low-temperature engineering, and in particular relates to an evaluation method for the influence of ultra-low temperature cooling on the mechanical properties of materials. Background technique [0002] In the process of material processing, applying ultra-low temperature cooling (less than -150°C) to the tool-material interaction area can not only greatly reduce the temperature of the cutting local area, but also significantly improve the machinability of the material, further improve the quality of the processed surface, and prolong the tool life. life. Moreover, liquid nitrogen is used as the cooling medium, which is green and environmentally friendly. For this reason, ultra-low temperature cooling has become one of the effective means of modification and processing of difficult-to-machine materials. [0003] However, during the ultra-low temperature cooling process, the processed material is inevitably modifi...

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Problems solved by technology

However, none of the above methods involves the evaluation of the influence of ultra-low temperature cooling on the mechanical properties of materials.

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