Homework Answers
Annealing is a process in which metals are heated and then cooled such that their physical , mechanical and electrical properties are different from their parent form earlier.
It makes metals soft and easily to bend, such that they can be used in many forms. Hence, option 'a' is not correct.
Since, metals after annealing is soft and easily to bends leads to increase in ductility. Hence, option 'e' is also not correct.
As we know that after annealing, metals becomes soft with more ductility. Hence metal's internal stress are relieved and internal stress decreases. Therefore, option 'c' is also not correct.
During annealing new stress free nucleate forms at high stress region in the cold worked micro-structure and hence metal's strength decreases while annealing. Hence, option 'b' is correct one.
Annealing helps in increasing grain size as new ncleate grains are induced from the pre-existing micro-structure. Hence, option 'd' is not correct.
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27. What is an effect of annealing a metal? (a) it will increase hardness (b) it...
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Q-12. Which stage of the annealing of a cold worked metal causes the strength and grain size to decrease? (a) Grain growth (b) Recrystallization (c) Recovery Q-13. What is termed a "stress-relief anneal” is achieved as a result of (a) Recovery (b) Recrystallization (c) Grain growth Q-14. During recovery, we expect all of the following EXCEPT (a) Residual stresses to be reduced or eliminated (b) Electrical conductivity to increase (c) The anisotropic behavior caused by cold working to be eliminated...
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0 A)Cold work generally lead to the following changes in a metal A. change in grain...
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Q-12. Which stage of the annealing of a cold worked metal causes the strength and grain size to decrease? (a) Grain growth (b) Recrystallization (c) Recovery Q-13. What is termed a "stress-relief anneal” is achieved as a result of (a) Recovery (b) Recrystallization (c) Grain growth Q-14. During recovery, we expect all of the following EXCEPT (a) Residual stresses to be reduced or eliminated (b) Electrical conductivity to increase (c) The anisotropic behavior caused by cold working to be eliminated...
One of the purposes of annealing plastic parts is to: increase the strength significantly increase the ductility significantly to stabilize dimensions through the relief of residual stresses to increase grain size significantly to decrease the degree of crystallinity A suitable technique to produce a thin walled hollow ceramic part is blow molding injection molding rotational molding thermoforming compression molding slip casting tape casting Calendaring During annealing of a plastically deformed metal, electrical conductivity generally decreases. True False In the Al-Mg...
A. If a material is tested in the linear part of the engineering stress-strain curve, what is expected behavior? B. Define the two trigonometric parameters in the definition of critical resolved shear stress C. How can hardness be used in determining the tensile strength? D. If an alloy is produced with a fine grain size, will it have higher or lower strength an opposed to igcoarse grained counterpart? E. How can solid solutions enhance strength? ! F. What is the...
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27. If an analysis of variance is used for the following data, what would be the effect of changing the value of SS2 to 100? Sample Data M1 15 M2 25 SS1-90 SS2 70 a. b. c. d. Decrease SSwithin and decrease the size of the F-ratio Decrease SSwithin and increase the size of the F-ratio Increase SSwithin and increase the size of the F-ratio increase SSwithin and decrease the size of the F-ratio
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0 A)Cold work generally lead to the following changes in a metal A. change in grain shape and a decrease in hardne B. increase in tensile strength C. increase in dislocation density both A. and B. both B. and C. Which of the following(s) is(are) for the strengthening mechanism(s) for single-phase alloys? A. Grain refinement B. Work hardening □ C. Solid solution both A. and B. both A. and C. both B. and C. All A., B. and C.
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