On deformation characterisation of machined surfaces and machining-induced white layers in a milled titanium alloy

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NSTL
Elsevier

外文摘要：Machining-induced white layers and severely deformed layers are undesirable surface integrity features which can be formed when machining high-strength aerospace alloys. An orthogonal milling process has been designed and performed to assess the impact of cutting speeds, tool wear, cutting edge radius and climb vs conventional milling on white layer formation and plastic strain distribution. The plastic deformation in the machined surface associated with the formation of white layers in Ti-6Al-4V has been quantified using micro-grids of different length scales printed using the electron beam lithography technique. It was found that white layers formed via the severe plastic deformation mechanism, at equivalent plastic strain values in excess of 1.2 and in regions of the cutting arc with the instantaneous chip thickness of less than the cutting-edge radius and ploughing and rubbing being the dominant mechanisms. The results indicated that the magnitude of the measured strains and the depth of plastically deformed material was greater at lower cutting speeds, during climb milling and when machining with a larger cutting edge radius and tool flank wear land.

外文关键词：

White layerSwept grainMicro-gridMachiningPlastic strain

作者：

Brown, M.、M'Saoubi, R.、Crawforth, P.、Mantle, A.、McGourlay, J.、Ghadbeigi, H.

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作者单位：

Univ Sheffield, Ind Doctoral Ctr Machining Sci, Adv Mfg Res Ctr Boeing, Rotherham S60 5TZ, S Yorkshire, England

Seco Tools AB, R&D Mat & Technol Dev, SE-73782 Fagersta, Sweden

Univ Sheffield, Adv Mfg Res Ctr Boeing, Rotherham S60 5TZ, S Yorkshire, England

Rolls Royce PLC, Derby, England

Univ Sheffield, Dept Mech Engn, Sir Frederick Mappin Bldg,Mappin St, Sheffield S1 3JD, S Yorkshire, England

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出版年：

2022

DOI：

10.1016/j.jmatprotec.2021.117378

Journal of Materials Processing Technology

EISCI

ISSN：0924-0136

年,卷(期)：2022.299

被引量11
参考文献量39