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Tool wear in turning of titanium alloy Ti–6Al–4V: Challenges and potential solutions for crater wear, diffusion and chip formation
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
2016 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Verktygsslitage vid svarvning av titanlegeringen Ti–6Al–4V : Utmaningar och möjliga lösningar för gropförslitning, diffusion och spånbildning (Swedish)
Abstract [en]

Titanium alloys are major materials used in the airplane industry, and prospects show that airplane production will double in the next 20 years. Consequently, the demand for cutting tools for machining of titanium alloys will increase. The primary problem when machining titanium alloys is their low thermal conductivity. Crater wear is the main factor limiting tool life, and is generally caused by thermal diffusion due to high temperatures in the tool-chip interface.

This master’s thesis was performed in collaboration with Sandvik Coromant, with the prospect to increase knowledge of how diffusion and chip formation influences crater wear progression. The aim was to study tool wear of cutting tools when turning Ti–6Al–4V. This was done by testing two different rake face geometries, both coated and uncoated, at cutting speeds of 30–115 m/min. Diffusion was investigated to learn about the impact it has on crater wear. Chips were examined to investigate chip formation and shear strain.

The coated modified rake face insert showed less crater wear only for the initial few seconds of machining. Uncoated inserts with a modified rake face showed higher diffusion rate and faster crater wear progression than did standard inserts. The standard inserts showed twice as long tool life as did the modified inserts. No significant differences in the chip formation mechanism were found between modified and standard inserts. Cracks were found within shear bands that were thinner than usual, which suggest that the generation of cracks allows less shear deformation.

Place, publisher, year, edition, pages
2016. , 149 p.
Series
UPTEC K, ISSN 1650-8297 ; 16021
Keyword [en]
Wear, Titanium, Ti6Al4V, Diffusion, Crater Wear, Chip Formation, Shear Strain, Cracks, Turning, Cutting Tools, Cemented Carbide, TiCN, Coating, Sandvik, Coromant
National Category
Materials Engineering Materials Chemistry Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-306373OAI: oai:DiVA.org:uu-306373DiVA: diva2:1040466
External cooperation
Sandvik Coromant, Västberga
Subject / course
Material
Educational program
Master Programme in Chemical Engineering
Supervisors
Examiners
Available from: 2016-10-28 Created: 2016-10-27 Last updated: 2016-10-28Bibliographically approved

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Applied Materials Sciences
Materials EngineeringMaterials ChemistryManufacturing, Surface and Joining TechnologyMetallurgy and Metallic MaterialsInorganic Chemistry

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