Metallurgical analysis and nanoindentation characterization of Ti-6Al-4V workpiece and chips in high-throughput drilling

Rui Li; Laura Riester; Thomas R. Watkins; Peter J. Blau; Albert J. Shih

doi:10.1016/j.msea.2007.03.054

Metallurgical analysis and nanoindentation characterization of Ti-6Al-4V workpiece and chips in high-throughput drilling

Rui Li, Laura Riester, Thomas R. Watkins, Peter J. Blau, Albert J. Shih

Neutron & X-Ray Scattering, & Thermophys

Research output: Contribution to journal › Article › peer-review

67 Scopus citations

Abstract

The metallurgical analyses, including scanning electron microscopy (SEM), X-ray diffraction (XRD), electron microprobe, and nanoindentation characterization are conducted to study the Ti-6Al-4V hole surface and subsurface and the chips in high-throughput drilling tests. The influence of high temperature, large strain, and high strain rate deformation on the β → α phase transformation and mechanical properties is investigated. Diffusionless β → α phase transformation in the subsurface layer adjacent to the hole surface can be observed in dry drilling, but not in other drilling conditions with the supply of cutting fluid. Nanoindentation tests identify a 15-20 μm high hardness subsurface layer with peak hardness over 9 GPa, relative to the 4-5 GPa bulk material hardness, adjacent to the hole surface in dry drilling. For drilling chips, the β phase is retained under all conditions tested due to rapid cooling. On the chips, the saw-tooth feature and narrow shear bands are only formed at the outmost edge and no significant change of hardness across the shear bands can be found in nanoindentation.

Original language	English
Pages (from-to)	115-124
Number of pages	10
Journal	Materials Science and Engineering: A
Volume	472
Issue number	1-2
DOIs	https://doi.org/10.1016/j.msea.2007.03.054
State	Published - Jan 15 2008

Funding

Assistances from Mr. Parag Hegde of Kennametal and Drs. Andrew Payzant, Paul Becker, and Ray Johnson and Mr. Larry Walker of Oak Ridge National Laboratory are greatly appreciated. A portion of this research was sponsored by the Heavy Vehicle Propulsion Systems Materials Program and Advanced Materials for High BMEP Engines Program, Office of Transportation Technologies, US Department of Energy. Experiments were sponsored by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of FreedomCAR and Vehicle Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US Department of Energy under contract number DE-AC05-00OR22725.

Keywords

Chip
Nanoindentation
Phase transformation
Ti drilling

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10.1016/j.msea.2007.03.054

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title = "Metallurgical analysis and nanoindentation characterization of Ti-6Al-4V workpiece and chips in high-throughput drilling",

abstract = "The metallurgical analyses, including scanning electron microscopy (SEM), X-ray diffraction (XRD), electron microprobe, and nanoindentation characterization are conducted to study the Ti-6Al-4V hole surface and subsurface and the chips in high-throughput drilling tests. The influence of high temperature, large strain, and high strain rate deformation on the β → α phase transformation and mechanical properties is investigated. Diffusionless β → α phase transformation in the subsurface layer adjacent to the hole surface can be observed in dry drilling, but not in other drilling conditions with the supply of cutting fluid. Nanoindentation tests identify a 15-20 μm high hardness subsurface layer with peak hardness over 9 GPa, relative to the 4-5 GPa bulk material hardness, adjacent to the hole surface in dry drilling. For drilling chips, the β phase is retained under all conditions tested due to rapid cooling. On the chips, the saw-tooth feature and narrow shear bands are only formed at the outmost edge and no significant change of hardness across the shear bands can be found in nanoindentation.",

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AU - Riester, Laura

AU - Watkins, Thomas R.

AU - Blau, Peter J.

AU - Shih, Albert J.

PY - 2008/1/15

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N2 - The metallurgical analyses, including scanning electron microscopy (SEM), X-ray diffraction (XRD), electron microprobe, and nanoindentation characterization are conducted to study the Ti-6Al-4V hole surface and subsurface and the chips in high-throughput drilling tests. The influence of high temperature, large strain, and high strain rate deformation on the β → α phase transformation and mechanical properties is investigated. Diffusionless β → α phase transformation in the subsurface layer adjacent to the hole surface can be observed in dry drilling, but not in other drilling conditions with the supply of cutting fluid. Nanoindentation tests identify a 15-20 μm high hardness subsurface layer with peak hardness over 9 GPa, relative to the 4-5 GPa bulk material hardness, adjacent to the hole surface in dry drilling. For drilling chips, the β phase is retained under all conditions tested due to rapid cooling. On the chips, the saw-tooth feature and narrow shear bands are only formed at the outmost edge and no significant change of hardness across the shear bands can be found in nanoindentation.

AB - The metallurgical analyses, including scanning electron microscopy (SEM), X-ray diffraction (XRD), electron microprobe, and nanoindentation characterization are conducted to study the Ti-6Al-4V hole surface and subsurface and the chips in high-throughput drilling tests. The influence of high temperature, large strain, and high strain rate deformation on the β → α phase transformation and mechanical properties is investigated. Diffusionless β → α phase transformation in the subsurface layer adjacent to the hole surface can be observed in dry drilling, but not in other drilling conditions with the supply of cutting fluid. Nanoindentation tests identify a 15-20 μm high hardness subsurface layer with peak hardness over 9 GPa, relative to the 4-5 GPa bulk material hardness, adjacent to the hole surface in dry drilling. For drilling chips, the β phase is retained under all conditions tested due to rapid cooling. On the chips, the saw-tooth feature and narrow shear bands are only formed at the outmost edge and no significant change of hardness across the shear bands can be found in nanoindentation.

KW - Chip

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Metallurgical analysis and nanoindentation characterization of Ti-6Al-4V workpiece and chips in high-throughput drilling

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