The task and methodical recommendations.

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1. To study on the diagram "iron - cementite" the zones of steels heating for quenching. To study the diagrams of isothermal decomposition of austenite and cooling curves, which corresponds to various types of quenching.

2. To investigate influence of carbon quantity on hardness of quenched steel. The results of the test to note in the table. By the results of the experiment to draw the dependence graph of steel hardness on carbon quantity in quenched steel.

Gauges number	Steel mark	Carbon quantity	Heating temperature for quenching, °С	Coling medium	Hardness, НRС	Structure name
				water
				water
	У8			water

Conclusions: ___________________________________________________________

______________________________________________________________________

3. To make cooling of steel 45 in various cooling media. To measure hardness of gauges. Experiment data to note in the table. To draw the dependence graph of hardness on cooling rate.

Gauges number	Steel mark	Cooling medium	Cooling rate, °С/sеc	Hardness after cooling, НRС	Structure name
		air
		oil
		water

Conclusions: ___________________________________________________________

______________________________________________________________________

4. To make quenching (in water) and tempering of gauges made of 45 steel at various temperatures. To measure hardness of gauges depending on tempering temperature. Experiment results to note in the table. To draw the dependence graph of hardness on tempering temperature.

Gauges number	Tempering temperature, °С	Tempering time, min	Hardness after quenching+tempering, НRС	Structure name

Conclusions: ________________________

___________________________________

5. To study and to draw the microstructures of steels 30, 45 and У8 after various types of heat treatment.

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