Why does titanium have poor machinability? Write at least four general characteristics that coatings for cutting tools and dies should possess
You are asked to turn ductile cast iron with various microstructure and hardness as shown in the following table
|
|
|
Hardness
(HB)
|
Ferrite
|
Pearlite
|
|
1
|
Annealed
|
186
|
97
|
3
|
|
2
|
As cast
|
265
|
20%
|
80%
|
|
3
|
Annealed
|
170
|
100
|
–
|
|
4
|
As cast
|
207
|
60
|
40
|
Draw a figure showing variation of tool life with cutting speed and the effect of work piece hardness and microstructure .