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Kinetics and Microstructural Control

· The effect of heat treatment on the properties (hardness) of various iron-carbon alloys is illustrated.
· The alloys are first quenched to give martensite, then heated above the T-T-T "nose" and isothermally transformed to get pearlite, and then heated to 600 - 700 C to obtain spheroidite.
· In all cases, increased carbon content increases the materials hardness. Ductility is increased by the sequence of treatments shown.

From: Guy & Hren, "Elements of Physical Metallurgy," Addison Wesley (1974)