| Abstrakt: |
1.As the result of hardening and tempering of medium carbon steels, a tempering sorbite structure is formed, which provides high static strength, plasticity, and impact strength but together with them a high sensitivity of the steel to stress concentration in cyclic loading. As the result after hardening and tempering parts do not always possess high fatigue resistance.2.To provide high fatigue resistance in parts weakened by stress raisers, it is desirable to use hardening and tempering in combination with strengthening treatments creating residual compressive stresses in the surface layers such as surface plastic deformation, accelerated water or oil cooling from temperatures below the critical (from the tempering temperature), or a combination of these strengthening treatments (thermoplastic surface treatment). |
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