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
ARC CHARACTERISTICS In order to understand the different output characteristics that are required by the welding power source it is necessary to understand the load which is f
what are the limitations of first law of thermodynamics?
Tributary lateral load: The question is on a fictitious 1965 building in Albany, NY. It was designed using the 1964 State Building Construction Code, in which Allowable Stress
1. Determine young''s modulus using first 20 data points 2. Determine yield strain and yield stress based on -0.1 offset 3. Determine max(or min) stress. 4. Determine toughness
Natural Polymers Rubber is individual natural polymer and was illustrated earlier. Specific trees exude thick liquid that solidified in brittle material termed as rosin. Shell
what is electron
By introducing their model of neural excitability in 1952, Alan Lloyd Hodgkin and Andrew Huxley not only shed light on the mechanism underlying a very important phenomenon in Physi
Fracture toughness of material of plate: A large thin plate carrying a crack of 70 mm at its centre is subjected to fluctuating stress cycle perpendicular to crack. s max = 7
Steel Rule: A steel rule is used to measure length. It has two scales - in millimeters and inches. These rules are available in market in discrete lengths such as 15, 30, 60 cms.
A motor coil can be modeled as a hollow copper cylinder with an outer diameter of 50 mm, an inner diameter of 40 mm, and a length of 60 mm. The motor stalls at time t ¼ 0 and, at t
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