1. Influence of milling parameters on the microstructural evolution mechanism of 7075-T6 aluminum alloy.
- Author
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Zhang, Ping, Zhang, Songting, Zhang, Jinlong, Sun, Yajie, Zhou, Hanping, and Yue, Xiujie
- Subjects
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RECRYSTALLIZATION (Metallurgy) , *CRYSTAL grain boundaries , *GRAIN size , *MILLING (Metalwork) , *MICROSTRUCTURE , *HIGH temperatures , *ALUMINUM alloys - Abstract
This study evaluates the influence of milling parameters on the milling process and microstructural changes in 7075-T6 aluminum alloy using experimental and simulation methods. Key findings include a direct correlation between milling parameters and higher chip temperatures, particularly influenced by milling speed which at its third level can cause temperature elevations up to 36 °C, ordered by impact as ap > f > v.Increasing milling depth markedly affects grain recrystallization, especially near the tool's trailing face (P3), leading to a 45.8% reduction in dynamic recrystallization, whereas lower depths expedite this process. Additionally, grain size and number at the leading face (P1) are also depth-dependent, with larger grains diminishing in volume yet increasing in quantity as depth increases. Enhanced milling speeds up to 500 mm/min significantly refine grains to near 1 μm at P1, with an 80.7% rise in recrystallization numbers, while at P3, grain size initially contracts then enlarges at 416 mm/min. Feed rate primarily impacts the quantity of recrystallized grains at the tool tip (P2), with a notable 60.4% increment and a swift transition from larger to smaller grains. Both P1 and P2 experience about a 20% reduction in grain growth due to feed rate, with more pronounced effects at P1 and the fragmentation of larger boundary grains into smaller, irregular shapes. • 7075 aluminum alloy machining microstructure evolution law was explored. • The influence of cutting parameters on microstructure evolution was explored. • The microstructure evolution of different deformation zones was compared. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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