Question

5. To reduce internal stresses of a hardened tool, the
method of heat treatment generally applied is
(a) Stabilising
(b) Annealing
(c) Normalising
(d) Tempering
​

Answer 1

Answer:

do no

Explanation:

do no because do no

Answer 2

To reduce internal stresses of a hardened tool, the method of heat treatment generally applied is tempering.

Explanation:

• Martensite is a very hard and brittle material that is generated via hardening. Tempering is used to decrease brittleness.
• The metal is heated to a temperature of 500°C to 650°C in the furnace and then cooled slowly.
• Hardened steel residual stresses are alleviated; ductility and toughness are increased.
• Steel is heated to a temperature that is below its hardening temperature.
• Keep the steel at that temperature for a certain amount of time.
• Cool the steel in still air if possible.