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INVESTIGATING TOOL WEAR MECHANISM AND MICROSTRUCTURAL CHANGES FOR CONVENTIONAL AND SUSTAINABLE MACHINING OF TITANIUM ALLOY

Khatri, Ashutosh Mahesh
http://rave.ohiolink.edu/etdc/view?acc_num=miami1533287855502478

Abstract Details

2018, Master of Science, Miami University, Mechanical and Manufacturing Engineering.
Titanium alloy (Ti-6Al-4V) has become an important choice of material for aerospace, automotive, and biomedical applications for its high strength-to-weight ratio and excellent corrosion resistance. However, machining of titanium alloy is still considered to be one of the major challenges to the industries. The objective of this study is to focus on two important aspects of titanium machining: tool wear and microstructural changes in the tool, workpiece, and chips during both conventional and sustainable machining processes. A series of experiments were conducted using end milling of Ti-6Al-4V with three different conditions namely dry, flood coolant, and minimum quantity lubrication (MQL). Both uncoated and titanium aluminum nitride (TiAlN)-coated carbide tools were used for machining Ti-6Al-4V at the same parameter settings. It was observed that abrasion was the dominant tool wear mechanism for all dry, flood coolant and MQL machining conditions. Adhesion and chipping were found to be two significantly dominant modes of tool failure in dry machining. The MQL machining conditions resulted in fewer occurrences of tool wear in most of the studied wear mechanisms. The chips were found to be serrated in nature regardless of the machining conditions and underwent microstructural and phase changes due to the machining conditions. The microstructure of Ti-6Al-4V workpiece revealed deformation at the subsurface of the machined face and the changes MQL machining were such that they enhance the material properties. The microstructure of the uncoated cutting tool revealed deformation near the cutting edges, and the microstructure of TiAlN-coated tool showed depletion in the coating layer from the cutting edges. Overall MQL machining condition proved to be better with respect to tool wear occurrences and machining performance.
Muhammad Jahan (Advisor)
Corti Giancarlo (Committee Member)
Khan Fazeel (Committee Member)
75 p.
Mechanical Engineering
Milling, titanium, machining, dry, flood coolant, MQL, chip morphology, chip microstructure, EDS, TiAlN, tool microstructure

Recommended Citations

Citations

  • Khatri, A. M. (2018). INVESTIGATING TOOL WEAR MECHANISM AND MICROSTRUCTURAL CHANGES FOR CONVENTIONAL AND SUSTAINABLE MACHINING OF TITANIUM ALLOY [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1533287855502478

    APA Style (7th edition)

  • Khatri, Ashutosh. INVESTIGATING TOOL WEAR MECHANISM AND MICROSTRUCTURAL CHANGES FOR CONVENTIONAL AND SUSTAINABLE MACHINING OF TITANIUM ALLOY. 2018. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1533287855502478.

    MLA Style (8th edition)

  • Khatri, Ashutosh. "INVESTIGATING TOOL WEAR MECHANISM AND MICROSTRUCTURAL CHANGES FOR CONVENTIONAL AND SUSTAINABLE MACHINING OF TITANIUM ALLOY." Master's thesis, Miami University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=miami1533287855502478

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Miami University and OhioLINK.