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MMET 207 Lab Final Exam Questions & Answers
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MMET 207 Lab Final Exam Questions & Answers
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MMET 207 Lab Final Exam Questions &Answers
Wrought Iron Correct Ans-ferrite and iron silicate stringers
Pack Carburized Steel Correct Ans-two outer layers-martensite and cementite
two inner layers-ferrite and pearlite
What is the echant composed of? Correct Ans-95% alcohol and 5% nitric acid
What is important to remember when mixing the echant? Correct Ans-always add the acid
What is the polishing media for metallography? Correct Ans-alumina or aluminum oxide
What are the sizes that the polishing media come in? Correct Ans-1, 0.3, and 0.05 michron
What are the order of the grit stages on the sandpaper used for etching? Correct Ans-240,
320, 400, and 600
What were the steels that were used during heat treating? Correct Ans-1018, 4340, and 52100
, What were the three quench methods that were used in heat treating? Correct Ans-water, air,
oil
What cooling method results in the hardest material? Correct Ans-water quench
What cooling method results in the least hard material? Correct Ans-air quench
How do tempering temperatures affect the material's hardness? Correct Ans-increases
ductility, decreases tensile strength, increases impact strength and decreases hardness
Heating and cooling cycle for hardening Correct Ans-1650-1700 degrees F for 1hr/in of
thickness; quench
Heating and Cooling cycle for tempering Correct Ans-800-1000 degrees F for 2 hours; air
cool
Heating and Cooling cycle for annealing Correct Ans-1650-1700 degrees F for 1 hr/in of
thickness; furnace cool
How was the lead-tin solidification diagram plotted? Correct Ans-x-axis was time, y-axis was
temperature in degrees C
What is undercooling? Correct Ans-where the liquidus line dips down into the solid region
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