Work

Simulation and Experimental Study of γ-TiAl Alloy Cutting with scCO2-MQL Based on Modified Heat Transfer Coefficient

Year: 2025

Type: article

Abstract: Current heat transfer coefficient models for scCO2-MQL exhibit critical limitations because they neglect the Mach disk phenomenon and the effects of radial velocity distribution in the scCO2 jets. These theoretical deficiencies result in significant deviations in the thermal predictions, limiting the application potential of scCO2-MQL technology in γ-TiAl machining applications. This study establishes a modified heat transfer coefficient model incorporating Mach disk and radial velocity distribution correction factors to characterise complex jet flow behaviour. Based on the modified heat transfer coefficient model, comprehensive simulation and experimental investigations were conducted to analyse cutting forces, cutting temperatures, stress distributions, and serrated chip formation during scCO2-MQL machining of γ-TiAl alloys. Results demonstrate that the modified model achieves superior predictive accuracy, with average relative error reductions of 21.8% for cutting force predictions and 37.3% for temperature predictions compared to conventional models. The developed modified heat transfer coefficient model establishes a foundation for the widespread application of scCO2-MQL cutting of γ-TiAl alloys.

Source: Coatings

DOI: 10.3390/coatings15101215

Authors: Limin Shi, Xuehao Zhao, Lixin Cui, Haonan Chen, Erliang Liu

Institutions: Tianshui Normal University, Changzhou University

Language: English

Topic: Advanced machining processes and optimization

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,137

Funders: National Natural Science Foundation of China, Natural Science Foundation of Gansu Province