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!
Jominy Test:
Additionally convenient laboratory test for harden-ability is Jominy test. A standard test piece of steel as illustrated in figure of The Jominy Test of Harden-ability is austenitized in usual manner. The lower end of the test piece is then quenched via a standard jet of water, resulting in a varying cooling rate.
Figure: The Jominy Test of Hardenability
The cooling rate at the jet end is about 300oC/sec whilst such at the other end is about 3oC/sec. it varying rate of cooling produces a broad range of hardness along the length of Jominy test piece. A flat portion is ground beside the length and hardness measured at different points. The plot of hardness along the length offers Jominy index of harden-ability.
The best utilization of the Jominy curve is made via drawing a horizontal line consequent to hardness of the semi-martensite zone. The semi-martensite zone hardness is explained in Table no.11. The point where such line requires the Jominy curve calculates the distance from the quenched end that can be inserted in figure of calculating the Diameter of Fully Hardened Articles as per to the Distance from the Quenched End to find out the diameter for a particular steel that will be fully hardened in water or oil.
Figure: Harden-ability Curves Plotted from End Quench Test Data
a) For Shallow; and
b) For Deep Hardening Steel
Figure: finding the Diameter of Fully Hardened Articles as per to the Distance from the Quenched End
Table no.1: Relationship between the Hardness of the Semi-Martensite Zone and the Carbon Content
Carbon-content %
Hardness of the Semi-martensite (Rc)
Carbon Steel
Alloy Steel
0.08 - 0.17
-
25
0.13 - 0.22
30
0.23 - 0.27
35
0.28 - 0.32
40
0.33 - 0.42
45
0.43 - 0.52
44
50
0.53 - 0.62
55
An aircraft moving with speed of 1200 Km/hr, uses simple air refrigeration cycle for air conditioning. The ambient temperature and pressure are 0.35 bar and - 10 o C respectively.
Which software is worth in learning for upcoming technologies in mechanical field?
design considerations
Q. Why we need additives explain? Additives are the materials added in small quantities to the moulding sand in order to enhance its exiting properties and to impart to it spec
synthesis to linkages
explain about pnp transistor
Polygon law of forces
Explain Thermodynamics System In thermodynamics the system is illustrated as the quantity of matter or region in space upon which the concentration is concentrated for the sake
A helical compression spring is used to take the shock. The initial compression of the spring is 30 mm and it is further compressed by 50 mm while absorbing the shock. The spring i
moment and axial force relation proof
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd