Heat Treatment lecture notes

Heat Treatment lecture notes - Heat Treatment of Steels MSE...

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Heat Treatment of Steels MSE 201Lab IV
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Samples AISI-SAE 1018 – 0.18 % C AISI-SAE 1045 – 0.45 % C AISI-SAE 1095 – 0.95 % C Austenitized at 870°C for 2 hours
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Heat Treatments A – Furnace Annealed – Slow cooled N - Normalized - Air cooled. O - Oil Quenched WQ – Water quenched. WT(370) – Water quenched, tempered at 370°C for 1 hour. WT(705) – Water quenched, tempered at 705°C for 1 hour.
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Jominy Test Generally, the faster steel cools, the harder it will be. The Jominy bar measures the hardenbility of a steel Softest Hardest
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Proceed to Furnace Room to: Quench the samples (except the normalized ones) Place the tempering samples into Furnaces Jominy Test demonstration
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Pearlite Formation Austenite precipitates Fe3C at Eutectoid Transformation Temperature (727°C). When slow cooled, this is Pearlite (looks like Mother of Pearl)
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Diffusion of Carbon in Pearlite
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Morphology of Pearlite (a) coarse pearlite (b) fine pearlite 3000X (a) (b)
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What About Cooling Rates? Faster cooling gives “non-equilibrium
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Heat Treatment lecture notes - Heat Treatment of Steels MSE...

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