Answer:
Check the explanation
Explanation:
Kindly check the attached image below to see the step by step explanation to the question above.
Answer:
Hot tear casting is the discontinuity or failures occurs during cooling or solidification phase in casting process. It is also known as hot crack
Explanation:
In case when the casting is of weak metal, when it is hot and casted, during the process residual stresses cause failures or discontinuity in casting as it cools resulting in hot tears i,e., material casted is partly liquid and partly solid.
Preventive measures:
- Ensure proper mold design
- A no. of gates should be used to even out temperature gradient.
- Over heated mold parts should not be used
- Proper choice of mold materials
Answer:
0.39 nM
Explanation:
The critical crack tip radius from the equation
attached below
for fracture to occur the бm will have to reach the fracture strength of material
i.e. бm = E/10
from equation 2 attached below
St = ( 400 * a * бo^2 ) / E^2 ------ 3
Given <em>: a = 2*10^-3 mm , бo = 275 MPa, E = 393 * 10^3 MPa ( gotten from table)</em>
Input given values into equation 3
St = 3.9 * 10^-7 ≈ 0.39 nM
Answer:
16
Explanation:
The product of feet and pounds is the torque. 18 inches is 1.5 feet.
(1.5 ft)(x lbs) = 24 ft·lbs
x lbs = (24 ft·lbs)/(1.5 ft) = 16 lbs
The force will be 16 pounds applied to an 18-inch wrench to obtain 24 ft·lbs.
Answer:
The probable grain-coarsening mechanism is : Ideal grain growth mechanism
( - = kt )
Explanation:
The plot attached below shows the time dependence of the growth of grain.
The probable grain-coarsening mechanism is : Ideal grain growth mechanism
the ideal growth follows this principle = = kt
d = final grain size
= initial grain size
k = constant ( temperature dependent )
t = 0