MSE 201 LAB II: Part b
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Transcript of MSE 201 LAB II: Part b
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MSE 201 LAB II: Part bMSE 201 LAB II: Part b
Annealing Copper AlloysAnnealing Copper Alloys
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Lab OverviewLab Overview
• Each alloy (Pure, 5% Zn, 10% Zn, 20% Zn) will Each alloy (Pure, 5% Zn, 10% Zn, 20% Zn) will be annealed for 45 minutes at 8 be annealed for 45 minutes at 8 temperatures:temperatures:
200°C, 250°C, 300°C, 350°C, 400°C, 500°C, 200°C, 250°C, 300°C, 350°C, 400°C, 500°C, 600°C, and 800°C600°C, and 800°C
• Hardness after each anneal will show amount Hardness after each anneal will show amount of recrystallization or grain growthof recrystallization or grain growth
• PROCEED TO FURNACE ROOM TO CONDUCT PROCEED TO FURNACE ROOM TO CONDUCT ANNEALINGANNEALING
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What is Recrystallization?What is Recrystallization?• Recovering damage and forming new grains by Recovering damage and forming new grains by
addition of heataddition of heat
(click to play)
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Stages During AnnealingStages During Annealing• I: RecoveryI: Recovery• II: RecrystallizationII: Recrystallization• III: Grain GrowthIII: Grain Growth
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Hardness vs. Annealing Temp
25
75
125
175
0 200 400 600 800
Temp, °C
Har
dn
ess,
DP
H 20% Zn
10% Zn
5% Zn
Pure Cu
Goal: Goal: Plot of Hardness vs. Annealing Plot of Hardness vs. Annealing TempTemp
I: Recovery
II: Recrystallization
III: Grain Growth
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Joined PlotsJoined PlotsHardness vs. %CW and Annealing TemperatureHardness vs. %CW and Annealing Temperature
25
45
65
85
105
125
145
165
185
0 200 400 600 800
Annealing Temp, C
25
45
65
85
105
125
145
165
185
0 10 20 30 40 50 60
%CW
Hardn
ess,
DPH
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http://www.copper.org/resources/properties/microstructure/brasses.html
Stress Free Grain
Grain Boundaries
Etch Pits
Annealing Twins
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http://www.copper.org/resources/properties/microstructure/brasses.html
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Slip LinesSlip Lines
Deformation BandsDeformation Bands
Distorted GrainsDistorted Grains
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New Crystal Formation
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Microstructure ExaminationMicrostructure Examination• 5% Zinc samples will be examined5% Zinc samples will be examined• Sample 242: Shows effects of % cold workingSample 242: Shows effects of % cold working• Sample 243: Shows effects of annealing temperature.Sample 243: Shows effects of annealing temperature.
• Look for:Look for:– Grain BoundariesGrain Boundaries– Stress Free GrainsStress Free Grains– Distorted GrainsDistorted Grains– New CrystalsNew Crystals– Deformation Deformation
BandsBands– Slip LinesSlip Lines– Annealing TwinsAnnealing Twins– Etch PitsEtch Pits– ScratchesScratches
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After Removing Samples…After Removing Samples…
• Remove oxide scale with sand paperRemove oxide scale with sand paper• Average hardness results for each Average hardness results for each
sample (HRF/HRB) and convert to sample (HRF/HRB) and convert to DPHDPH
• Make sure data sheet is completely Make sure data sheet is completely filled outfilled out
• Place samples in recycle box.Place samples in recycle box.• Turn Data Sheet in to TATurn Data Sheet in to TA
Remember: There is a report DUE NEXT WEEK!Remember: There is a report DUE NEXT WEEK!