Hardening of quenched high-speed steel by deformation
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Deformation (1–1.5%) of hardened and single-tempered high-speed steel R18 followed by single tempering substantially increases the strength and plasticity (by 20–50%).
The optimum deformation is 1–1.5%; 0.5% deformation has a small effect; 2.5% deformation weakens the steel, apparently due to overaging.
An increase of the number of temperings after deformation from one to the normal three increases the strength and plasticity slightly. Precipitation-hardening processes are so intensified by deformation that an increase of the number of subsequent temperings has only a small effect.
Deformation of hardened and tempered high-speed steel sharply reduces the amount of residual austenite.
Deformation of hardened and tempered high-speed steel R18 with a martensite structure followed by tempering reduces the coercive force Hc more than 30%.The same is true of the specific electrical resistance.
The changes in the physical properties confirm the fact that the phenomena observed are based on the intensifying effect of deformation on precipitation-hardening and the formation of a more stable structure.
KeywordsAustenite Martensite Stable Structure Coercive Force Subsequent Tempering
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