11 Names Date: ID: A Unit Quiz Heat Treating Multiple Choice kdentify the choice

Question

11 Names Date: ID: A Unit Quiz Heat Treating Multiple Choice kdentify the choice that best completes the statement or answers the question. 1. Which of the following is not a common quenching media? a. Molten Salt 2. Which of the following is NOT used as a method of heating steel for heat treating? a. Controlled atmosphere fumace b, Allotropism 3. This hard, brittle structure is formed when a carbon-rich steel isquenched rapidly. a. Austenite Pearlite b. Martensite d. Ferrite 4. This is a laminar layered) structure of ferrite and cementite. It forms when a carbon-rich steel is cooled a. Austenite b. Martensite d. Ferrite 5. This structure (also known as alpha iron) is soft and ductile. a. Austenite b. Martensite d. Ferrite 6. This structure is Fcc and easily absorbs carbon. is the gamma phase on the iron-carbon phase diagram c. Pearlite b. Martensite d. Ferrite 7. This is a procedure for determining how deeply a particular steel can be hardened. a. Rockwell C Scale c. Charpy impact test b. Jominy end-q hardenability test d. zod impact test uench 8. Which of the following are ways to harden only the surface of component? a. Selective surface heating c. Carburizing & Nitriding b. Changing surface chemistry d. All of the above 9. This softening process is usually done immediatly after quenching. It involves reheating the metal to transform martensite to ferrite and small particles of cementite. Helps restore toughness, and reduces the a. Allotropic expansion c. Tempering (or drawing) b. Induction d. Annealing 10. This softening process transforms cementite to spherical shapes. Makes the steel less prone to stress concentration. Increases toughness and allows cold working. It is accomplished by "soaking" a steel at a temperature just below the lower critical temperature (eutectoid temp) for an extended period of time. a. Annealing Spheroidizing b. Normalizing d. Process annealing

Explanation / Answer

1.c.carbon

2.c.torch

3.b.martensite

4.a.austenite

5.d.ferrite

6.a.austenite

7.b.jominy end-quencher hardenability test

8.c.carburizing and nitriding

9.d.annealing

10.c.spherodizing

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