Martempering, Mechanical Engineering

Martempering:

The piece to be hardened is wholly austenitized and after that quenched in a lead of salt bath held at a temperature simply above at that martensite would begin to form. This is maintained at this temperature till its temperature becomes uniform throughout that is inside and outside temperatures do not stay different and is after that water quenched to form entire bainite formation and martensite structure is prevented. From the austenite-martensite expansions such procedure successfully separates the cooling contraction and hence prevents quench cracking in large articles. The procedure of martempering is illustrated in following figure.

1780_Martempering.png

Figure: Martempering represented on the TTT Curve

The steel can be tempered to low temperatures for additionally refine the structure.

Table no. illustrates a few properties obtained from martemper, austemper and quenchtemper treatments.

Heat Treatment

Hardness

(Rc )

Impact

(J)

Elongation % (on 25 min gl)

Water quench, Temper

53.0

8.22

0

Water quench, Temper

52.5

9.60

0

Martemper, Temper

53.0

19.20

0

Martemper, Temper

52.8

16.44

0

Austemper

52.0

30.83

11

Posted Date: 2/26/2013 6:16:14 AM | Location : United States







Related Discussions:- Martempering, Assignment Help, Ask Question on Martempering, Get Answer, Expert's Help, Martempering Discussions

Write discussion on Martempering
Your posts are moderated
Related Questions
proof of work being a path function

assumptions made in parallelogram law of forces

Describe vibration and explain different types of vibration. Add following harmonic motions analytically:- X 1 = 4 cos (wt +100) X 2 = 6 sin (wt +600)

Equations of static equilibrium: In particular, if the forces are parallel and we take z-axis parallel to them, then the first, second and last equations are identically satis


Micrometer (or Screw Gauge): There are two different types of micrometers - inside and outside micrometers. A micrometer also has two scales - Main scale and Vernier scale (Figure

actual division 2km is shown as 1 cm in a map.construct a clean scale to measure km which can travel a distance upto 30 km.Show measurement of 18 km in the scale

The Cu-Sb system contains 2 eutectics, 1 eutectoid, 1 peritectic and 1 peritectoid. Mark them all on the figure, write down the temperature and composition of each point, and ident

Indicate size, capacity and noise reducing characteristics of all silencers on plans, including silencers for vane-axial fans. Indicate all acoustical lining on drawings, genera

a) Define Economics Order Quantity. Derive, using neat diagram, the mathematical formula for economic order quantity. b) The purchase manager of an industrial unit is placing on