9. We used Backlite Powder for which :-
Working Temperature = 160°C to 170°C
Working Pressure = 130 kg/cm²
Working Time = 6 to 9 minutes
10.
11. To decrease the depth of scratch as a result
of sectioning.
Course grit abrasive is used ( SiC paper )
Wet and Pressure grinding is used
The angle must be changed upto 45 degree
after each successive 4-5mins
12. To make the surface shinny
It wont remove the scratches
Diamond paste was used
along with an oil
A radial to and fro motion
was given to the specimen to
make it mirror like
13. To increase the optical behavior of
micro-structural feature
Improve the grain size and
visibility of phases
Etching is done by an echant
known as Nital solution
Regent attacks selectively on the
specimen
14. After etching specimen was
then dried with dryer.
Heater is used to dry the
specimen
HEATER
15.
16.
17. OUR SPECIMEN IS ANNEALED
During Planner grinding & intermediate
polishing , scratch removal was quite easy.
The specimen is soft
Refined grain structure
More Ferrite grains & less pearlite grains .