Nitriding of Steel

Question 1

When is nitriding carried out?

Answer 1

In ferrite steel below eutectic temp

Question 2

Do phase transformations occur? Why or why not?

Answer 2

Phase transf don’t occur because the temperatures are low

Question 3

Are there dimension changes?

Answer 3

No

Question 4

Are case depths deep or shallow?

Answer 4

Shallow

Question 5

What causes the increase in surface hardness?

Answer 5

Fine dispersion of nitride precipitates

Question 6

Is quench hardening required? Why or why not?

Answer 6

Quench hardening is not required because formation of martensite is not necessary because formation of martensite doesn’t increase surface hardness

Question 7

How do you obtain substantial increase in hardness after nitriding?

Answer 7

Steel must contain alloys like Al, Ti, Cr, V, Mo, etc.

Question 8

What type of steel are nitriding steel?

Answer 8

Medium carbon

Question 9

Does nitriding steel give lower or higher surface hardness than martensitic hardening?

Answer 9

Higher