For all heat resistant tool steels there are maximum temperatures at which selfdiffusion processes occur at significantly higher rates. At tempering temperatures some what below the maximum tempering temperature the processes of precipitation and hardening are accelerated, and softening processes at somewhat higher temperatures.
The maximum tempering and heating temperatures of precipitation-hardening steels and alloys depend on the α ⇄ γ transformation temperature.
The difference in the maximum tempering temperatures and rate of hardening for one alloy or another is evident in the early stages of decomposition (hardening).
The higher the α ⇄ γ transformation temperature, the larger the heat resistance of tool steels and alloys hardened by precipitation hardening.
The phase transformation temperatures of tool steels and machining steels should be compared.
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Kremnev, L.S., Brostrem, V.A. Heat resistance of tool steels and alloys. Met Sci Heat Treat 15, 225–230 (1973). https://doi.org/10.1007/BF00648158
- Phase Transformation
- Transformation Temperature
- Heat Resistance
- Tool Steel