Exam 3 Answers

Exam 3 Answers - MSE 200-002 Test#3 Instructor: Dr. A....

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MSE 200-002 Test#3 Instructor: Dr. A. Gruverman ID Number ____________________________________________ This is a closed book test. No notes, books, or information stored in calculator memories may be used. Cheating will be punished severely. All of your work must be written on these pages and turned in. Be sure that you read and answer all parts of each question. Using a pencil, fill your answers on the scan sheet. After you complete the exam return the scan sheet AND your exam hard copy to the instructor. Section 1: (Questions 1 – 12) General multiple choice questions 1. As the carbon content in steel is increased there is also, in general, a/an a. increase the hardness of the alloy ( d ) b. decrease the ductility of the alloy c. increase the yield strength of the alloy d. all of the above 2. The steel microstructure that exhibits the highest hardness and lowest ductility is: a. martensite ( a ) b. spheroidite c. coarse pearlite d. tempered martensite 3. For a given alloy composition on a phase diagram, the solidus line indicates the temperature at which: a. the first nuclei of a solid phase appear upon cooling b. the material goes through a eutectoid reaction ( c ) c. the first nuclei of a liquid phase appear upon heating d. none of the above 4. Cored structure is a result of a. equilibrium cooling b. non-equilibrium cooling c. eutectic reaction (b) 5. A eutectoid reaction is best described as a transformation of a. one solid phase into two new solid phases upon cooling ( a ) b. a liquid phase into two new solid phases upon cooling c. a liquid phase into a combination of solid and liquid phases upon cooling d. a solid phase into a combination of liquid and solid phases upon cooling
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6. Bainite a. forms during a peritectic reaction ( c ) b. forms in diffusionless transformation into body centered tetragonal structure c. contains an extremely fine mixture of Fe 3 C and ferrite d. none of the above 7. Which is not a mixture of cementite (Fe 3 C) and ferrite ( α) a. f i n e p e a r l i t e ( c ) b. bainite c. martensite d. coarse pearlite 8. An isomorphous system such as the Cu-Ni binary (complete solid solution) is possible when a. the atoms have approximately the same radius ( d ) b. the pure components have the same crystal structure c. the atoms are both electropositive and close in valency d. all of the above should be satisfied 9. A phase transformation reaction, such as the eutectoid
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This test prep was uploaded on 04/02/2008 for the course MSE 200 taught by Professor Wholedepartment during the Spring '08 term at N.C. State.

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Exam 3 Answers - MSE 200-002 Test#3 Instructor: Dr. A....

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