t3sum03

# t3sum03 - Home Introduction Policies Resources Requirements...

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Home Introduction Policies Resources Requirements & Grading Syllabus Assignments Handouts Discussion Web Links Distance Learners Contact MSE 200 Test 3 Formulae that may be used:

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s= s oexp(-t/tr), tr = troexp(Q/kT) Answer all the questions. All percentages in phase diagrams and iron-carbon diagram are we Q1. 1.Label the above phase diagram and determine the correct labeling of the diagram (a) 2. The above phase diagram represents an a. isomorphous system b. limited solubility on one side and no solubility on the other c. no solubility on both sides ( b) 3. The above phase diagram has a. sloping solvus lines on both sides b. sloping solvus line one side c. no solubility on both sides (b ) 4. The invariant point in the phase diagram close to 75% B alloy is a. eutectic point b. eutectoid point c. peritectic point (a ) 5. The phases that will be present at room temperature in a 60%B alloy are a. L+b b. a+ b c. B and b ( c) 6. The number of regions in the phase diagram with degrees of freedom equal to 2 are a. 4 b. 3 c. 1 (b) Q2. In the phase diagram given below with correct labeling, determine the following and answer the questions.
1. The maximum solid solubility of A in B is a. 20% b. 80% c. 50% (a ) 2. The eutectic point is close to a. 20% of B b. 50% of B c. 80% B ( b) 3. The fraction of b in the eutectic alloy slightly below eutectic temperature is a. 0.5 b. 0.2 c. 40/85 (a ) 4. The fraction of proeutectic phase in 30% A above eutectic temperature is a. 2/3-a b. 1/3 -b c. none (a ) 5. The fraction of phase b in the 30 % A alloy below eutectic is a. 5/6 b. 1/6 c. 2/3 ( a) 6. The fraction of b in the euetctic lamellar structure in the 30% A alloy below eutectic temperature is a. 1/6 b. 0.5 c. 5/6 (a ) Q 3. In the Fe-C diagram given below, answer the following questions.

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1. The microsctruture of an alloy with 0.6% carbon below 727oC consists of a. chunky ferrite b. chunky ferrite plus pealrlite c. only pearlite (b ) 2. The fraction of proeutectoid phase in 0.6% carbon steel above 727oC is close to a. 2/8 b. 6/8 c. 0 (a ) 3. The fraction of cementite in the 0.6% carbon steel below 727oC is a. 0.6/(6.7) b. (6.1)/(6.7) c. (0.8)/(6.7) (a )
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## t3sum03 - Home Introduction Policies Resources Requirements...

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