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
brifely explain 2r-2p invertion

Q. CSCC in Gas Streams? Due to process upset of FWKO or Treater, there may be chance of chloride carry over into the gas lines. Depending on the chloride contents of formation

Calculate the feed in Drilling Operation Calculate the feed in m/min if a drill makes 200 revolutions per minute and penetrates to a distance of 3 mm per revolution. Solut

Cross Drainage Works: Culverts A large number of culverts are needed for taking care of the streams crossing the railway lines. The culverts can be one of the followi

What is Tube Drawing - cold drawing processes This kind of drawing is very similar to bar drawing process and in majority of cases it is accomplished by the use of a draw be

Q. Skid assemblies and modular structures? This specification describes parameters for the design, fabrication, materials and installation of the structural steel part of skid

what is the maximum principle stress

Find the minimum weight to keep equilibrium: A belt supports the two weights W 1 an d W 2 over a pulley as shown in the figure given below. If W 1 = 1000N, fi

Write the velocity relationship in orthogonal cutting. A bar of 75 mm dia. is reduced to 73 mm by a cutting tool while cutting orthogonally. If the mean length of cut chip is 73.5

Calculate the radius of plates: A laminated steel spring, simply supported at the ends & centrally loaded, along a span of 0.8 m; is needed to carry a proof load of 8 kN; and