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Study of Porosity in Uncoated Cemented Carbide Tools During Titanium Alloy Machining.

Botermans, Cornelis LU (2023) MMTM01 20231
Production and Materials Engineering
Abstract
During high speed machining of titanium alloys both the tool and workpiece material diffuse into one another affecting the surface integrity of the cutting tool edge and leading to fracture. One proposed mechanism by which the tool integrity is compromised results from the possible formation of porosity in to subsurface of the tool substrate close to the tool cutting edge. In this study the porosity in uncoated cemented
carbide tools during titanium alloy machining is investigated. In order to simulate the diffusion process,
diffusion couples between titanium and WC-6%Co are studied at various pressure (0 - 2.5 GPa) and temperature (800-1200 °C) conditions. Cross sectioned diffusion couples were analysed with SEM and XEDS. Pore
... (More)
During high speed machining of titanium alloys both the tool and workpiece material diffuse into one another affecting the surface integrity of the cutting tool edge and leading to fracture. One proposed mechanism by which the tool integrity is compromised results from the possible formation of porosity in to subsurface of the tool substrate close to the tool cutting edge. In this study the porosity in uncoated cemented
carbide tools during titanium alloy machining is investigated. In order to simulate the diffusion process,
diffusion couples between titanium and WC-6%Co are studied at various pressure (0 - 2.5 GPa) and temperature (800-1200 °C) conditions. Cross sectioned diffusion couples were analysed with SEM and XEDS. Pore
formation was identified in two of the 6 samples that were analysed. The cause is unknown but believed to
be Kirkendall porosity, where vacancies nucleate due to a net flux of vacancies towards the insert. As part of
this study worn milling and turning inserts were also investigated. No voids were observed during analysis
of the cross sectioned turning insert. In one milling insert groups of cavities are found in the binder phase,
however, these are believed to not be formed by diffusion wear, but rather by plastic deformation. The presence of voids along the cutting edge is observed in one insert, the origin of these cavities are unknown. It’s
the first time that porosity in titanium machining has been the focus of a study and it progresses the field
forward. (Less)
Please use this url to cite or link to this publication:
author
Botermans, Cornelis LU
supervisor
organization
course
MMTM01 20231
year
type
H2 - Master's Degree (Two Years)
subject
language
English
id
9136692
date added to LUP
2023-10-02 14:32:10
date last changed
2023-10-02 14:32:10
@misc{9136692,
  abstract     = {{During high speed machining of titanium alloys both the tool and workpiece material diffuse into one another affecting the surface integrity of the cutting tool edge and leading to fracture. One proposed mechanism by which the tool integrity is compromised results from the possible formation of porosity in to subsurface of the tool substrate close to the tool cutting edge. In this study the porosity in uncoated cemented
carbide tools during titanium alloy machining is investigated. In order to simulate the diffusion process,
diffusion couples between titanium and WC-6%Co are studied at various pressure (0 - 2.5 GPa) and temperature (800-1200 °C) conditions. Cross sectioned diffusion couples were analysed with SEM and XEDS. Pore
formation was identified in two of the 6 samples that were analysed. The cause is unknown but believed to
be Kirkendall porosity, where vacancies nucleate due to a net flux of vacancies towards the insert. As part of
this study worn milling and turning inserts were also investigated. No voids were observed during analysis
of the cross sectioned turning insert. In one milling insert groups of cavities are found in the binder phase,
however, these are believed to not be formed by diffusion wear, but rather by plastic deformation. The presence of voids along the cutting edge is observed in one insert, the origin of these cavities are unknown. It’s
the first time that porosity in titanium machining has been the focus of a study and it progresses the field
forward.}},
  author       = {{Botermans, Cornelis}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Study of Porosity in Uncoated Cemented Carbide Tools During Titanium Alloy Machining.}},
  year         = {{2023}},
}