<p>ME 437 Fall 2004 – Materials midterm</p><p>Only select one choice in multiple choice questions.</p><p>1. This criteria is a measure of the material’s ability to be deep hardened through heat treatment. ______</p><p>2. Which criteria is the direct measure of stiffness or rigidity:</p><p> a) Hardness b) Yield strength c) Modulus of elasticity d) Toughness</p><p>3. What intermetalic compound is responsible for the high strength of steels:______</p><p>4. The room temperature equilibrium structure of iron is. a) Austenite b) Pearlite c) -ferrite d) Cementite</p><p>5. Pearlite is a micro structure of steel that is composed of layers of -ferrite and graphite. (T F).</p><p>6. Ductile iron is a form of: a) Plain carbon steel b) Pure iron c) Cast iron d) Alloy steel</p><p>7. What heat treatment process is used to release residual stresses after welding, forming, or heat treatment:______</p><p>8. If steel with sufficient carbon content is heated to austenite and then quenched rapidly, what is the name of resulting hard micro-structure? ______. </p><p>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</p><p>10. Alloys that can withstand high temperatures w/o loosing their strength and rigidity are called :______. A common alloy is ______</p>