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HARDENING, QUENCHING, AND TEMPERING
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a steel in the austenitic phase (at temperatures
over 723 °C) is suddenly cooled, the austenite
transforms into martensite, a structure characterised
by great hardness. Some toughness can be restored
when the steel is tempered. The optimal values
for the steel's mechanical properties are
obtained when the steel is tempered at high
temperatures up to 700 °C. This is the
preferred method for workpieces that must
exhibit high toughness under dynamic loading. |
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