Hardenability refers to the material characteristics characterized by the depth of the hardened layer and the hardness distribution of the sample under specified conditions. It mainly depends on the critical quenching cooling rate of the material. Under specified conditions, it determines the characteristics of the hardening depth and hardness distribution of steel. That is, the ability of steel to obtain the depth of the hardened layer when quenching, which indicates the ability of steel to accept quenching.
The depth of the hardened layer, also called the depth of the hardened layer, refers to the depth from the surface of the steel to the semi-martensite area of the steel (martensite accounts for 50% of the organization and the remaining 50% is pearlite type organization) (some steel types such as tool steel and bearing steel need to measure to 90% or 95% of the martensite area organization). The greater the depth of the hardened layer of steel, the better the hardenability of this steel.
Hardening capacity refers to the ability of steel to harden during quenching, which is expressed by the highest hardness that can be obtained by quenching into martensite. It mainly depends on the carbon content in martensite. The higher the carbon content, the higher the hardenability of the steel. The influence of other alloying elements is relatively small. Hardenability refers to the ability of austenitized steel to obtain martensite during quenching. Its size is expressed by the depth of the hardenable layer and hardness distribution obtained by quenching the steel under certain conditions.
Hardenability refers to the maximum hardness that can be achieved by the martensitic structure formed at a cooling rate exceeding the critical cooling rate under ideal quenching conditions, also known as hardenability.
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