MSE170 Heat Treatment Lab - microstructure support

MSE170 Heat Treatment Lab - microstructure support - Lab...

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Lab IV: Phase Transformations Sample Data Brass 360 Aluminum 2024 Steel 4340 Steel 1018 Quench Soft 58 HRB Soft off-scale low HRB no precipitates, saturated alloy solution Hardest 43 HRC Martensite Hardest 38 HRC martensite or bainite Quench + Anneal Hardest 70 HRB Optimum large number and small size of precipitates Hard 40 HRC tempered martensite Hard 32 HRC tempered martentsite or tempered bainite Slow Cool Soft off-scale low HRB Overaged Soft 94 HRB pearlite Soft 90 HRB pearlite Slow Cool + Anneal Soft off-scale low HRB Even more overaged Soft 88 HRB tempered pearlite Soft 74 HRB tempered pearlite *All hardness values are from a previous quarter and should not be expected to match your data exactly, but your numbers should be in the same relative order (hardest to softest) for each material – example: for the Quenched 4340 sample, you shouldn’t expect to get exactly 43 HRC, but that sample should be the hardest of the rest of your 4340 samples
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Medium Grains Brass 360 30 % Zn All alpha
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MSE170 Heat Treatment Lab - microstructure support - Lab...

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