ME 437 Mechanical System Design

ME 437 Fall 2004 – Materials midterm

Only select one choice in multiple choice questions.

1. This criteria is a measure of the material’s ability to be deep hardened through heat treatment. ______

2. Which criteria is the direct measure of stiffness or rigidity:

a) Hardness b) Yield strength c) Modulus of elasticity d) Toughness

3. What intermetalic compound is responsible for the high strength of steels:______

4. The room temperature equilibrium structure of iron is. a) Austenite b) Pearlite c) -ferrite d) Cementite

5. Pearlite is a micro structure of steel that is composed of layers of -ferrite and graphite. (T F).

6. Ductile iron is a form of: a) Plain carbon steel b) Pure iron c) Cast iron d) Alloy steel

7. What heat treatment process is used to release residual stresses after welding, forming, or heat treatment:______

8. If steel with sufficient carbon content is heated to austenite and then quenched rapidly, what is the name of resulting hard micro-structure? ______.

9. Which of the following steels has the highest hardenability? a) AISI 4340 steel b) Plain low-carbon steel c) Plain high-carbon steel d) Gray cast iron

10. Alloys that can withstand high temperatures w/o loosing their strength and rigidity are called :______. A common alloy is ______