1600 2800 1400 2400 y liquid 1200 1148 (2098\'1 2000 12 (1674 1600 800 727 (1341

Question

1600 2800 1400 2400 y liquid 1200 1148 (2098'1 2000 12 (1674 1600 800 727 (13419 0.77 1200 6000.02 800 400 Weight percent carbon Pigure 3: Iron-Carbon equilibrium phase diagram Question 22. (4 Points) A sample of an FoC alloy with 2 wt% C is at a temperature of 1200C, Using Figure 3, estimate the wt% contents of the existing phases. 1. 90.5 wt% austenite and 9.5 wt% liquid 2, 83.8 wt% austenite and 16.2 wt% Fe3C 3. 20.8 wt% cementite and 79.2 wt% austenite 4, 23.4 wt% liquid and 766 wt% martensite Question 23. (1.5 Points) Precision is best described as, 1. the ability to hit what is aimed at. 2. variation of the measurement process 3. repeatability of the process 4. none of the above. Question 24. (1.5 Points) Which of the following best describes an advantage of cold working when com- pared to hot working 1. Better surface finish is obtained. 2. Less ductility is available. 3. Lower forces are required. 4. Higher forces are required.

Explanation / Answer

22. At 1200 degree and 2% carbon austenite and liquid phases are present.

option 1 is right

23. precision is the repeatability of the process.

Option 3 is correct.

24. In cold working better surface finish is obtained.

So option 1 is correct.

orrect

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