Consider an AISI 1045 ferrite and pearlite microstructure. The sample is initially heated to 845 deg C and quenched in water. The samples are then tempered for 20 minutes at 316 deg c, 425 deg c, and 600 deg c.  Can yu tell me what would happen to the microstructure hardness os the samples as a result of quenching, tempering theory wise.

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Thermal Properties of Materials

In mechanical engineering, the thermal property is represented as the physical quantity that is relevant to the application of heat. The thermal properties are evaluated by variations in any specific material due to low heat or high heat. The quantities that influence the thermal property of the materials are mass, density, temperature, and many others.