Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
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
52.5
9.60
Martemper, Temper
19.20
52.8
16.44
Austemper
52.0
30.83
11
What do you mean by thermodynamic equilibrium? Compare irreversible process with reversible process. Give some examples of irreversible process.
Two concentric perforared plates are seperated by a 200mm launder and form the flow exit for a clarifier (figure 1). The inlet water flow of 1200 mcubed/hour into the clarifier is
What is the coefficient expansion of transformer oil? Ans) Transformers can be filled with several types of Refined Mineral Oil. That coefficient is something you would find in
Q. Explain Machining allowance? Machining allowance or finish allowance indicates how much larger the rough casting should be over the finished casting to allow sufficient mat
Define Properties of System For defining any type of system particular parameters are required. Properties are those observable characteristics of the system, which can be util
Seam Welding Seam welding is different from spot welding by the fact that roller type electrodes are used in the former case. The principle and process of welding are the same
A diluted polymer solution with a density of 1130 kg/m3 was extruded through a capillary tube of 3.5 mm internal diameter and 1 m long. The following results were obtained at 25°C.
Difference between SI and CI engines SI engine stands for spark ignition engine while CI engine stands for compression ignition engine. SI engine works on the principle of w
A ball is thrown from a point with a speed V at an angle of projection θ . From the same point and at the same instant, a person starts running with a constant speed V/2 to catc
A single plate clutch, effective on both sides is needed to transmit 25 KW at 3000 r.p.m. Calculate the outer and inner diameters of frictional surface if the coefficient of fricti
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd