Answer / vignesh

ANNEALING - heating the material and cooling in furnace/air
to impart ductility,relieve stress,
TEMPERING - reheating below critical temperature after
quenching to increase ductility.
NORMALIZING- heating to achieve even grain structure.remove
effects of previous heat treatment

Answer / sunny

Annealing : Its a process in which first the component is
heated till austenitising temperature & then cooled by
keeping furnace off so that to increase ductility.

Normalising : Hardening process where the component is air
cooled after heating till austenitising temperature.

Tempering : After hardness, tempering is done to increase
ductility.

Answer / sunil

annealing-reduces hardness
normalising-incresses hardness
tampering- improve toughness

Answer / karthick

All are different heat treatment process.In general heat
treatment process is used to impart desired mechanical
properties to materials.Annealing is the process of heating
the material and holding that for some time and then
cooling it in suitable rate(in air).it is used to refine
the grain size,to relieve the internal stresses.Tempering
is the process of heating the hardened material.it is used
to impart toughness.Normalizing is the process of heating
40 deg above recrystallization temp and cooling it in
furnace

i want to know how a dg set run/works and what is strock and what difference in between two and four strock engine.

0 Answers  

---

What do u mean about Gear Coupling Number like 101,102,103.....110,112....and how u will get proper Number of Gear Coupling.,Explain it.

2 Answers   TATA,

---

What are the advantages and disadvantages of gear drives over belt drives?

0 Answers  

---

What are the safety devices of boiler?

0 Answers   ABC Inc, RRB, Siemens,

---

What is the materials of cotter joints?

0 Answers  

---

Air is a bad conductor of heat.why it becomes hot in summer?

2 Answers  

---

Is it the stress that, produces strain or strain produces stress?

1 Answers  

---

WHat is adsl?

0 Answers   Cisco, Maruti Suzuki,

---

what is bearing stress?

4 Answers  

---

The advantage of a controllable pitch propeller?

2 Answers   RRB,

---

Why do you want to work at our company

4 Answers   Chevron, Cisco,

---

Define Fluidised bed boiler ?

0 Answers   Hindalco,

---