Multi-scale modeling calculation method for bearing steel material M50 alloy

Abstract

The invention discloses a multi-scale modeling calculation method of a bearing steel material M50 alloy, and belongs to the field of multi-phase alloy multi-scale modeling. Comprising the following steps: delimiting a sample observation area; carrying out phase type and distribution identification and elemental composition and crystal structure analysis on the sample in the observation area to obtain a mesoscopic element mass ratio and elemental compositions of different phases; establishing an atomic scale model of a single phase according to the phase type and the crystal structure; establishing an equation through the mesoscopic element mass ratio and phase element composition, and solving the number of each phase in the atomic model and the proper size of an iron matrix; randomly inserting several phase structures into the iron matrix according to the obtained phase proportion, and optimizing the structure to obtain a micro-mesostructure model of the bearing steel material M50 alloy; various properties of the alloy can be simulated on the mesoscale based on the model, and the structural transformation process of the alloy on the atomic scale during heat treatment and damage and the damage mechanism of the M50 alloy can be simulated and observed.

Description

technical field [0001] The invention belongs to the field of bearing steel multi-scale simulation, in particular to a multi-scale modeling calculation method of bearing steel material M50 alloy. Background technique [0002] The main bearing of aero-engine works in the environment of high temperature, high speed, lack of oil, and time-varying impact load, and is prone to damage and failure, which is a weak link in aero-engine. From the perspective of macro failure of rolling bearings, there are failure modes such as pitting and spalling, slipping damage, friction and wear, and corrosion. From the perspective of material structure, the failure of materials has point defects such as atomic vacancies, gaps and substitutions and dislocations at the microscopic scale. Contour defects; at the mesoscopic scale, there are defects such as grain boundaries, phase boundaries and stacking faults. The failure process of the bearing involves the coupling effect at multiple scales. It is d...

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Problems solved by technology

At present, the existing research on M50 alloy mainly focuses on its treatment method, strengthening method and its optimization of its element ratio, and there are few researches on its micro-scale and multi-scale modeling.

For the multi-scale research field of metals, the research objects are mostly pure metals or alloys with fewer elements, and there are fewer studies on alloys with many elements and complex dopant phases; the research methods are mostly based on various theories of molecular dynamics The simulation calculation of the simulation calculation, the experiment is the final verification method, the combination of simulation and experiment is low, and it is not completely applicable to the M50 alloy; therefore, the existing multi-scale modeling technology of the bearing steel material M50 alloy needs to be further improved

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