Open AccessEffect of tool wear on quality in drilling of titanium alloy Ti6Al4V, Part II: Microstructure and Microhardness
Author(s) -
Kaushik Das,
Mahdi Eynian,
Anders Wretland
Publication year - 2017
Publication title -
high-speed machining
Language(s) - English
Resource type - Journals
ISSN - 2299-3975
DOI - 10.1515/hsm-2017-0002
Subject(s) - indentation hardness , microstructure , titanium alloy , metallurgy , drilling , materials science , tool wear , titanium , alloy , machining
Drilling of Ti6Al4V with worn tools can introduce superficial and easily measured features such as increase of cutting forces, entry and exit burrs and surface quality issues and defects. Such issues were presented in the part I of this paper. In part II, subsurface quality alterations, such as changes of the microstructure and microhardness variation is considered by preparing metallographic sections and measurement, mapping of the depth of grain deformation, and microhardness in these sections. Drastic changes in the microstructure and microhardness were found in sections drilled with drills with large wear lands, particularly in the dry cutting tests. These measurements emphasize the importance of detection of tool wear and ensuring coolant flow in drilling of holes in titanium components.