Titanium
TA6V4 - GRADE 5 - HB 135 - 103 HBR - 271 HV
TA6V alloy, known for its low density, superior corrosion resistance, and strong mechanical properties, is the most prevalent titanium alloy. It stands out from grade 23 (TA6V4ELI) due to its increased oxygen content. This alloy is primarily used in manufacturing structural components, engine parts, and aeronautical fasteners. Its exceptional corrosion resistance makes TA6V4 ideal for marine environments, surface treatment, and deck fittings industries.
GET SOME THEORY FROM THE BOOKS
Wet abrasive cutting stands out as the most suitable method for materialographic cutting due to its minimal impact on the specimen in relation to the processing time. This technique involves the use of a cut-off wheel comprising abrasive particles and a binder.
DURING THE PROCEDURE
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The sample should accurately reflect the characteristics of the original piece or component from which it is derived.
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The cut-off wheel should experience minimal wear and tear.
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The cut-off wheel should not face obstruction during the cutting process.
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There should be no occurrence of thermal damage or burning on the surface of the specimen.
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The specimen should be cool to the touch upon extraction from the machine.
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The presence of burrs should be minimized.
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The resulting surface should exhibit a uniform and smooth appearance with consistent scratches.
RECOMMENDED
We recommend you to mount your samples the most convenient way, giving attention to the heat resistance of the sample material, although, if a mounting press is unavailable, cold mounting becomes the sole viable option. Conversely, with access to a mounting press, the selection of mounting material can be refined based on specific attributes.
A crucial factor to consider is the abrasion rate, which denotes the speed at which material is ground or polished away. Ideally, the chosen mounting material should closely match the abrasion rate of the sample material. It is essential to recognize that the abrasion rate differs from the hardness of the sample.
As for the resin needs, we recommend the use of Epoxy resin as Epoxies offer a robust mounting solution with high resistance to chemicals and abrasion. Although they typically require a longer setup time compared to other castable materials, they exhibit superior flow and minimal shrinkage properties. For mounting challenging samples, long-cure epoxies are employed, and they can be introduced into a vacuum environment to eliminate trapped air and address voids.
IN THE END
If necessary, calibrate the sample with a coarser grit to make sure flat surface is achieved. The workpiece should be perfectly flat.
Time used 8 min
Rotation (sample holder) Clockwise
Speed 150 RPM
Pressure (30mm samples) 1.5-1.7 DaN
Achieved surface roughness at this step 0.237 Ra
Fluid Water
Time used 6
Rotation (disc-workpiece) >>
Speed 150
Pressure (30mm samples) 1,7-2,0
Start Ra/End Ra 0,196-0,061
Fluid water
ROTATION: 45
TIME: XX SEC
FLUID: RESIN BONDED
PRESSURE: XX BAR
Time used 6
Rotation (disc-workpiece) >>
Speed 150
Pressure (30mm samples) 1,7-2,0
Start Ra/End Ra 0,196-0,061
Fluid water
Time used 6
Rotation (disc-workpiece) >>
Speed 150
Pressure (30mm samples) 1,7-2,0
Start Ra/End Ra 0,196-0,061
Fluid water
Time used 6
Rotation (disc-workpiece) >>
Speed 150
Pressure (30mm samples) 1,7-2,0
Start Ra/End Ra 0,196-0,061
Fluid water
Time used 6
Rotation (disc-workpiece) >>
Speed 150
Pressure (30mm samples) 1,7-2,0
Start Ra/End Ra 0,196-0,061
Fluid water
Time used 6
Rotation (disc-workpiece) >>
Speed 150
Pressure (30mm samples) 1,7-2,0
Start Ra/End Ra 0,196-0,061
Fluid water
Time used 6
Rotation (disc-workpiece) >>
Speed 150
Pressure (30mm samples) 1,7-2,0
Start Ra/End Ra 0,196-0,061
Fluid water
When working with a flat sample, the 40 µm abrasive is the first step in the grinding process for Titanium Grade 5. If the sample is not flat, you should start with a coarser grit in order to get a flat surface. It's crucial to remember that the diameter of the sample determines the amount of force that is used during grinding; in this case, the sample is 30 mm in diameter. It's also advised to turn the plate and sample holder in a clockwise direction to avoid causing the sample undue damage.
Pre-polishing is not neccessairy in this step for this material.
Time used 15 min
Rotation (sample holder) Clockwise
Speed 150 RPM
Pressure (30mm samples) 1.5 DaN
Achieved surface roughness at this step 0.070 Ra
Fluid Water
A 9 µm abrasive is used as the starting point for the Titanium Grade 5 polishing processes. Then, after the 9 µm, a 2 µm abrasive is utilized. The sample diameter determines the force that is used during polishing; the sample that is being used has a diameter of 30 mm. It's imperative that every scratch points in the same direction; otherwise, you'll need to go back and redo the previous step.
5 5000g 10x
Time used 7 min
Rotation (sample holder) Counterclockwise
Speed 150 RPM
Pressure (30mm samples) 1.5 DaN
Achieved surface roughness at this step 0.037 Ra
Fluid Colloidal Silica
Finally, a suitable pad with a colloidal silica solution is utilized to clean and execute the last polishing step, providing a mirror-like finish to the Titanium sample.
6 Colloidal Silica 10x