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Study On Milling Of Intermetallic Ti2AlNb Alloy

Posted on:2015-01-28Degree:MasterType:Thesis
Country:ChinaCandidate:X D MaFull Text:PDF
GTID:2181330422480638Subject:Mechanical Manufacturing and Automation
Abstract/Summary:PDF Full Text Request
Intermetallic Ti2AlNb alloy has broad application prospects in aerospace field due to it’s lowdensity, high specific strength at elevated temperature, excellent oxide and creep resistance. Currently,the machinability of Ti2AlNb is still lack in-depth study, which restricts the development of itsefficient processing technology. In this paper, the milling experiment of Ti2AlNb is carried out usingcoated cemented carbide tools, the cutting force, cutting temperature, tool wear and surface integrityare researched. The research results could provide some instructive information for thehigh-efficiency and precision milling of intermetallic Ti2AlNb alloy.The main contents are as follows:(1) The cutting force and temperature of Ti2AlNb and TC4are compared. Cutting force andtemperature of Ti2AlNb are higher than that of TC4because of the higher strength of Ti2AlNb thanthat of TC4at elevated temperature. The effects of cutting parameters and tool wear on cutting forceand temperature are investigated.(2) Three-dimensional microscope, SEM and EDS are utilized to analyze the wear feature andwear mechanism of tools. During high speed milling Ti2AlNb, the numerous of thermal cracking isthe main cause of tool wear. Beside, the empirical equation of tool life is established.(3) Surface integrity is analyzed through surface roughness, work hardening and surface residualstress. The results indicate that when high speed milling Ti2AlNb, the surface roughness Ra can becontrolled under0.4μm. Soften area is formed on the machined surface and the residual stress iscompression one.
Keywords/Search Tags:intermetallic, cutting force, cutting temperature, tool wear, surface integrity
PDF Full Text Request
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