科研之友
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摘要
Ultra-fast cooling has been increasingly applied in producing high-strength steels. In this study, the microstructure and mechanical properties of a martensitic steel quenched at an ultra-fast cooling rate were studied and compared with those of the steel quenched at a conventional water-cooling rate. The results showed that the tensile strength and yield strength of the ultra-fast cooled specimens were approximately 150 and 208 MPa higher than those of the conventional water-cooled specimens, respectively. The increases could be attributed mainly to dislocation strengthening according to the theoretically calculated results of dislocation strengthening on the basis of the measured values of dislocation density, which was increased from 1.26 10(-16) to 1.60 x 10(-16) m(-2) when the cooling rate increased to ultra-fast region. Thus, the results of this study mean that the strength of martensitic steels could be improved through ultra-fast cooling.
