Papers by Gokce Mehmet AY
Moving parts that are essential to life are subject to wear and friction. Coatings, lubrication a... more Moving parts that are essential to life are subject to wear and friction. Coatings, lubrication and heat treatment are some operations conducted to reduce these effects and prolong part life. Plasma Transferred Arc coating is an important coating method for hard coating. It is used in various industrial applications such as automotive valves, glass and ceramic molds and plastic extrusion dies. In PTA powder content that is used for coating is an important point of research. In this study microstructure and wear behavior of AISI 4140 steel surface coated by Boron Carbide was inspected. Ekabor II powder that contains Boron Carbide was mixed with a Nickel base to produce coating powder. Wear tests were conducted on a Ball-on- Disk device with circular geometry. Optical Microscopy was used to characterize microstructure of coating layer formed on the surface of AISI 4140. It was found that although Boron Carbide content has positive improvements these improvements lessen after 10% Ekabor by weight in coating.
Railway rails work in contact with railway vehicle wheels.During this contact high surface contac... more Railway rails work in contact with railway vehicle wheels.During this contact high surface contact stresses anddifferent sliding speeds occur between wheel-rail pair.Stress values that occur on top and side of rail geometryare different. This situation causes wear and damage onrail material in time.In this study primarily the rail material that is used in ourcountry was characterized. Wear experiments areconducted in dry and wet conditions, different contactstresses and sliding speeds in order to sample rail-wheelcontact. All wear tests were performed according to DIN50324 standard with WC ball as counter object in a ball ondisc geometry. Wear surfaces were characterized byoptically, SEM microstructure analysis and EDS analysis,friction coefficients and wear rates were calculated forevery test condition. As a result damage that occurs on railmaterial during working conditions were tried to bedetermined.
Industrial Lubrication and Tribology, 2019
Purpose Plasma transferred arc (PTA) coating is a novel method for surface-coating applications. ... more Purpose Plasma transferred arc (PTA) coating is a novel method for surface-coating applications. In this method, the substrate is melted using a plasma arc, and surfacing agents such as carbides are introduced to the melt pool. The purpose of this study is to investigate the effect of boron carbide (B4C) in nickel-based coating on AISI 4140 steel. Design/methodology/approach Samples were tested on a ball-on-disc wear device, and the microstructure, as well as wear properties, were investigated using SEM and XRD. Findings The effect of B4C addition was shown to be linear, with a p-value of 0.0248, indicating strong evidence. The reason for this increase was found to be the increase in third-body generation resulting from hard phases that form couples with the soft base material, nickel. It was concluded that using 6 per cent B4C was the optimal solution. Originality/value In the literature, the effect of neither low temperature on a nickel coating with B4C nor B4C as a single surfaci...
Industrial Lubrication and Tribology, 2019
Purpose
Plasma transferred arc (PTA) coating is a novel method for surface-coating applications.... more Purpose
Plasma transferred arc (PTA) coating is a novel method for surface-coating applications. In this method, the substrate is melted using a plasma arc, and surfacing agents such as carbides are introduced to the melt pool. The purpose of this study is to investigate the effect of boron carbide (B4C) in nickel-based coating on AISI 4140 steel.
Design/methodology/approach
Samples were tested on a ball-on-disc wear device, and the microstructure, as well as wear properties, were investigated using SEM and XRD.
Findings
The effect of B4C addition was shown to be linear, with a p-value of 0.0248, indicating strong evidence. The reason for this increase was found to be the increase in third-body generation resulting from hard phases that form couples with the soft base material, nickel. It was concluded that using 6 per cent B4C was the optimal solution.
Originality/value
In the literature, the effect of neither low temperature on a nickel coating with B4C nor B4C as a single surfacing agent in a nickel base has been investigated.
Industrial Lubrication and Tribology
Purpose
Plasma transferred arc (PTA) coating is a novel method for surface-coating applications. ... more Purpose
Plasma transferred arc (PTA) coating is a novel method for surface-coating applications. In this method, the substrate is melted using a plasma arc, and surfacing agents such as carbides are introduced to the melt pool. The purpose of this study is to investigate the effect of boron carbide (B4C) in nickel-based coating on AISI 4140 steel.
Design/methodology/approach
Samples were tested on a ball-on-disc wear device, and the microstructure, as well as wear properties, were investigated using SEM and XRD.
Findings
The effect of B4C addition was shown to be linear, with a p-value of 0.0248, indicating strong evidence. The reason for this increase was found to be the increase in third-body generation resulting from hard phases that form couples with the soft base material, nickel. It was concluded that using 6 per cent B4C was the optimal solution.
Originality/value
In the literature, the effect of neither low temperature on a nickel coating with B4C nor B4C as a single surfacing agent in a nickel base has been investigated.
Reducing effect of wear and friction is an important research area in machine design. In order to... more Reducing effect of wear and friction is an important research area in machine design. In order to reduce these effects; lubrication, heat treatments and coatings are used on machine parts. Hard coatings are used in wear intensive environments and Plasma Transferred Arc (PTA) Coating is an innovative hard coating method. PTA coatings are used in applications such as automotive valves, glass and ceramic molds and plastic extrusion dies. PTA coating properties are gained from coating powder, thus coating powder research is an important aspect. In this study microstructure and wear behavior of AISI 4140 steel surface coated by Boron Carbide was inspected. Two different mixtures was prepared, Ekabor II ™ powder that contains Boron Carbide and pure Boron Carbide was mixed with a Nickel base to produce two different coating powder recipes. Wear tests were conducted on a Ball-on-Disk device with circular geometry. Optical and Electron Microscopy was used to characterize microstructure of coating layer formed on the surface of AISI 4140.
Moving parts that are essential to life are subject to wear and friction. Coatings, lubrication a... more Moving parts that are essential to life are subject to wear and friction. Coatings, lubrication and heat treatment are
some operations conducted to reduce these effects and prolong part life. Plasma Transferred Arc coating is an important coating
method for hard coating. It is used in various industrial applications such as automotive valves, glass and ceramic molds and
plastic extrusion dies. In PTA powder content that is used for coating is an important point of research. In this study
microstructure and wear behavior of AISI 4140 steel surface coated by Boron Carbide was inspected. Ekabor II powder that
contains Boron Carbide was mixed with a Nickel base to produce coating powder. Wear tests were conducted on a Ball-on-
Disk device with circular geometry. Optical Microscopy was used to characterize microstructure of coating layer formed on
the surface of AISI 4140. It was found that although Boron Carbide content has positive improvements these improvements
lessen after 10% Ekabor by weight in coating.
1st International Workshop of Railway Systems Engineering
Railway rails work in contact with railway vehicle wheels.
During this contact high surface cont... more Railway rails work in contact with railway vehicle wheels.
During this contact high surface contact stresses and
different sliding speeds occur between wheel-rail pair.
Stress values that occur on top and side of rail geometry
are different. This situation causes wear and damage on
rail material in time.
In this study primarily the rail material that is used in our
country was characterized. Wear experiments are
conducted in dry and wet conditions, different contact
stresses and sliding speeds in order to sample rail-wheel
contact. All wear tests were performed according to DIN
50324 standard with WC ball as counter object in a ball on
disc geometry. Wear surfaces were characterized by
optically, SEM microstructure analysis and EDS analysis,
friction coefficients and wear rates were calculated for
every test condition. As a result damage that occurs on rail
material during working conditions were tried to be
determined.
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Papers by Gokce Mehmet AY
Plasma transferred arc (PTA) coating is a novel method for surface-coating applications. In this method, the substrate is melted using a plasma arc, and surfacing agents such as carbides are introduced to the melt pool. The purpose of this study is to investigate the effect of boron carbide (B4C) in nickel-based coating on AISI 4140 steel.
Design/methodology/approach
Samples were tested on a ball-on-disc wear device, and the microstructure, as well as wear properties, were investigated using SEM and XRD.
Findings
The effect of B4C addition was shown to be linear, with a p-value of 0.0248, indicating strong evidence. The reason for this increase was found to be the increase in third-body generation resulting from hard phases that form couples with the soft base material, nickel. It was concluded that using 6 per cent B4C was the optimal solution.
Originality/value
In the literature, the effect of neither low temperature on a nickel coating with B4C nor B4C as a single surfacing agent in a nickel base has been investigated.
Plasma transferred arc (PTA) coating is a novel method for surface-coating applications. In this method, the substrate is melted using a plasma arc, and surfacing agents such as carbides are introduced to the melt pool. The purpose of this study is to investigate the effect of boron carbide (B4C) in nickel-based coating on AISI 4140 steel.
Design/methodology/approach
Samples were tested on a ball-on-disc wear device, and the microstructure, as well as wear properties, were investigated using SEM and XRD.
Findings
The effect of B4C addition was shown to be linear, with a p-value of 0.0248, indicating strong evidence. The reason for this increase was found to be the increase in third-body generation resulting from hard phases that form couples with the soft base material, nickel. It was concluded that using 6 per cent B4C was the optimal solution.
Originality/value
In the literature, the effect of neither low temperature on a nickel coating with B4C nor B4C as a single surfacing agent in a nickel base has been investigated.
some operations conducted to reduce these effects and prolong part life. Plasma Transferred Arc coating is an important coating
method for hard coating. It is used in various industrial applications such as automotive valves, glass and ceramic molds and
plastic extrusion dies. In PTA powder content that is used for coating is an important point of research. In this study
microstructure and wear behavior of AISI 4140 steel surface coated by Boron Carbide was inspected. Ekabor II powder that
contains Boron Carbide was mixed with a Nickel base to produce coating powder. Wear tests were conducted on a Ball-on-
Disk device with circular geometry. Optical Microscopy was used to characterize microstructure of coating layer formed on
the surface of AISI 4140. It was found that although Boron Carbide content has positive improvements these improvements
lessen after 10% Ekabor by weight in coating.
During this contact high surface contact stresses and
different sliding speeds occur between wheel-rail pair.
Stress values that occur on top and side of rail geometry
are different. This situation causes wear and damage on
rail material in time.
In this study primarily the rail material that is used in our
country was characterized. Wear experiments are
conducted in dry and wet conditions, different contact
stresses and sliding speeds in order to sample rail-wheel
contact. All wear tests were performed according to DIN
50324 standard with WC ball as counter object in a ball on
disc geometry. Wear surfaces were characterized by
optically, SEM microstructure analysis and EDS analysis,
friction coefficients and wear rates were calculated for
every test condition. As a result damage that occurs on rail
material during working conditions were tried to be
determined.
Plasma transferred arc (PTA) coating is a novel method for surface-coating applications. In this method, the substrate is melted using a plasma arc, and surfacing agents such as carbides are introduced to the melt pool. The purpose of this study is to investigate the effect of boron carbide (B4C) in nickel-based coating on AISI 4140 steel.
Design/methodology/approach
Samples were tested on a ball-on-disc wear device, and the microstructure, as well as wear properties, were investigated using SEM and XRD.
Findings
The effect of B4C addition was shown to be linear, with a p-value of 0.0248, indicating strong evidence. The reason for this increase was found to be the increase in third-body generation resulting from hard phases that form couples with the soft base material, nickel. It was concluded that using 6 per cent B4C was the optimal solution.
Originality/value
In the literature, the effect of neither low temperature on a nickel coating with B4C nor B4C as a single surfacing agent in a nickel base has been investigated.
Plasma transferred arc (PTA) coating is a novel method for surface-coating applications. In this method, the substrate is melted using a plasma arc, and surfacing agents such as carbides are introduced to the melt pool. The purpose of this study is to investigate the effect of boron carbide (B4C) in nickel-based coating on AISI 4140 steel.
Design/methodology/approach
Samples were tested on a ball-on-disc wear device, and the microstructure, as well as wear properties, were investigated using SEM and XRD.
Findings
The effect of B4C addition was shown to be linear, with a p-value of 0.0248, indicating strong evidence. The reason for this increase was found to be the increase in third-body generation resulting from hard phases that form couples with the soft base material, nickel. It was concluded that using 6 per cent B4C was the optimal solution.
Originality/value
In the literature, the effect of neither low temperature on a nickel coating with B4C nor B4C as a single surfacing agent in a nickel base has been investigated.
some operations conducted to reduce these effects and prolong part life. Plasma Transferred Arc coating is an important coating
method for hard coating. It is used in various industrial applications such as automotive valves, glass and ceramic molds and
plastic extrusion dies. In PTA powder content that is used for coating is an important point of research. In this study
microstructure and wear behavior of AISI 4140 steel surface coated by Boron Carbide was inspected. Ekabor II powder that
contains Boron Carbide was mixed with a Nickel base to produce coating powder. Wear tests were conducted on a Ball-on-
Disk device with circular geometry. Optical Microscopy was used to characterize microstructure of coating layer formed on
the surface of AISI 4140. It was found that although Boron Carbide content has positive improvements these improvements
lessen after 10% Ekabor by weight in coating.
During this contact high surface contact stresses and
different sliding speeds occur between wheel-rail pair.
Stress values that occur on top and side of rail geometry
are different. This situation causes wear and damage on
rail material in time.
In this study primarily the rail material that is used in our
country was characterized. Wear experiments are
conducted in dry and wet conditions, different contact
stresses and sliding speeds in order to sample rail-wheel
contact. All wear tests were performed according to DIN
50324 standard with WC ball as counter object in a ball on
disc geometry. Wear surfaces were characterized by
optically, SEM microstructure analysis and EDS analysis,
friction coefficients and wear rates were calculated for
every test condition. As a result damage that occurs on rail
material during working conditions were tried to be
determined.