AME/ISE True False DMP I Final (Answer T/F for all questions) 1)T FDuring recove

Question

AME/ISE True False DMP I Final (Answer T/F for all questions)

1)T FDuring recovery, which occurs at a certain temperature range below the recrystallization temperature of the metal, no significant change in mechanical properties such as hardness results material stress required for slip 2) T FAnisotropy is the appearance of more than one crystal structure in a 3) T FEntanglements and impediments to the dislocations decrease the shear 4) T FThe strain rate is a function of the specimen length while the deformation 5) T FThe velocity of the strip decreases from its entry value as it moves through 6) T FIncreasing temperature generally increases a material's ductility and 7) T FAbove the liquidus temperature, complete liquid exists and below the 8) TFThe Rockwell Hardness test uses a pyramidal indenter with the curved 9) TFA phase diagram shows the relationships among the temperature, the rate is not the roll gap, in flat rolling toughness solidus temperature you have full solid surface area of penetration correlating to the hardness composition and the phases present in a particular alloy system under equilibrium conditions 10) T FThe Brinell Hardness test gives essentially the same hardness number regardless of the load

Explanation / Answer

1. As recover takes place below the recrystallization temperature there is no significant change in the microstructure of the materials. During recovery physical properties of the cold worked materials are restored without observable change in microstructure. ( True)

2. Anisotropy is the direction dependent elastic property of the material.Appearance of more than one crystal structure of a material is called allotropy ( False)

3. Entanglement and impediments leads to the obstruction in the dislocation movement leading to the increment of shear stress required for slip. ( False)

4. Strain rate is strain per unit time & strain depends upon length , rate of deformation are mainly for fluid particles particles so independent of lenght. ( True)

5. Before the neutral point velocity of roll is larger than strip velocity whereas after the neutral point velocity of strip becomes greater than the roll velocity. so velocity of strip increases from entry to the exit ( False)

6.At high temperature the ductility and toughness is higher, at higher temeptemper dislocation can move easliy so plastic deformation is easier. At low temperature material is brittle so its impact strength is lower than that at higher temperature. (True)

7. Liquidus line is rhe line which separate liquid phase with that of mushy zone and solidus line separate mushy zone with solid phase ( True)

8. Rockwell hardness test uses a ball of around 1.58 mm diameter for soft and cone of 120° with spherical tip of 0.2 mm radius for hard material. pyramid indenter is used in Vickers hardness testing ( False)

9. Phase diagram is a plot of all temperature composition space showing the stability of various phases ( True)

10. Brinell hardness number depends upon the load, hardness number will increase or decrease depending upon the amount of load .( False)

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