1. True or False- The martensitic transformation in a through hardening steel pu

Question

1. True or False- The martensitic transformation in a through hardening steel puts tensile or seperating stresses at the surface of the steel at room temperature.

2. True or False- The highest cooling rate occurs during the liquid cooling stage of quenching.

3. Martempering or marquenching reduces the tendency of martensite to crack by

a. raising the hardenability

b. lowering the effective carbon content

c. cooling the outter and inner portions at more equal rates

d. temering the martensite

e. producing bainite rather than martensite

4. A fully bainitic steel is produced by the process of

a. normalizing

b. spheroidizing

c. austempering

d. quench and tempering

e. austenitizing

5. Slow cooling a hypereutectoid steel from just above the lower critical line  A3,1 is called

a. full annealing

b. normalizing

c. process annealing

d. austempering

e. stress relief annealing

6. Which following methods are suitable for controlling the properties of nonferrous metals?

a. cold working

b. annealing

c. alloying

d. solution heat treating and precipitation hardening

e. all the above

Explanation / Answer

1 true

2 false

3 c. cooling the outter and inner portions at more equal rates

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